Test data

Sintered NdFeB Demagnetization Curves (Measured, N35–N56, M, H, SH, UH, EH)

Every 20 °C curve on this page comes from a hysteresisgraph test report of an AIC sintered NdFeB production lot, measured on a Ø8–10 mm cylinder sample at 20 °C. For legibility each chart is redrawn from the report: the J-H curve is traced point by point from the original plot, B-H and B×H are derived from it, and every number in the results box is copied from the report's own Measurement Results panel. The original scan (tester names, report numbers and letterheads blanked out) is linked under each chart. The variable-temperature charts further down are shown as the original scans.

The values are single-lot test results, not guaranteed minimums. The grade table on the product page lists typical values; specification limits for an order are agreed per order, and we can supply the test report of the actual lot. Some grades measured here (e.g. N56, 54H, 52SH, 52UH, 45EH, cerium and T grades) are not in that standard table — ask us about them.

How to read the curves

Upper flat line ending in a vertical drop — the intrinsic J-H curve. Where it crosses the H axis is HcJ: the higher it is, the more heat and reverse field the magnet survives.
Straight-then-bending line — the normal B-H curve. Its value at H = 0 is Br (remanence); where it reaches the H axis is HcB.
Parabola, read on the middle (MGOe) scale — the energy product B×H. Its peak is (BH)max.
Hk/HcJ (squareness) — how square the J-H knee is. Hk is the field at which J has fallen to 90 % of Br; the closer Hk/HcJ is to 1, the steeper the knee.

All measured grades at 20 °C

Click a grade button to see its curve. Rated max working temperature is the series rating at a high permeance coefficient (Pc ≥ 2); thin parts run cooler.

Grade	Br (T)	HcJ (kA/m / kOe)	(BH)max (kJ/m³ / MGOe)	Hk/HcJ	Max temp.
N35	1.189	1033 / 12.97	275 / 34.56	0.970	≤ 80 °C
N40	1.267	1040 / 13.07	312.4 / 39.25	0.984	≤ 80 °C
N42	1.307	1025 / 12.88	319.4 / 40.14	0.960	≤ 80 °C
N45	1.365	1047 / 13.15	361.7 / 45.45	0.990	≤ 80 °C
N48	1.384	1012 / 12.72	364.6 / 45.82	0.987	≤ 80 °C
N50	1.403	1099 / 13.8	377.4 / 47.42	0.979	≤ 80 °C
N52	1.451	1111 / 13.96	390.6 / 49.08	0.988	≤ 80 °C
N56	1.485	1034 / 12.99	423.1 / 53.17	0.979	≤ 80 °C
35M	1.207	1177 / 14.79	279.7 / 35.15	0.987	≤ 100 °C
38M	1.249	1170 / 14.7	297.4 / 37.37	0.978	≤ 100 °C
42M	1.308	1116 / 14.02	332.7 / 41.81	1.001	≤ 100 °C
45M	1.350	1183 / 14.87	345.7 / 43.44	0.985	≤ 100 °C
48M	1.387	1171 / 14.71	367.9 / 46.23	0.983	≤ 100 °C
50M	1.402	1171 / 14.71	374.5 / 47.06	0.984	≤ 100 °C
52M	1.435	1208 / 15.18	393.3 / 49.42	0.980	≤ 100 °C
54M	1.469	1153 / 14.49	406.9 / 51.13	0.967	≤ 100 °C
33H	1.153	1385 / 17.41	254.2 / 31.95	0.977	≤ 120 °C
35H	1.207	1472 / 18.5	282 / 35.44	0.972	≤ 120 °C
40H	1.269	1345 / 16.9	313.5 / 39.4	0.946	≤ 120 °C
42H	1.303	1419 / 17.83	325.9 / 40.95	0.990	≤ 120 °C
45H	1.344	1421 / 17.85	345.9 / 43.47	0.988	≤ 120 °C
48H	1.377	1436 / 18.04	367.9 / 46.23	0.971	≤ 120 °C
50H	1.423	1473 / 18.51	387.2 / 48.65	0.988	≤ 120 °C
52H	1.429	1475 / 18.53	393.3 / 49.42	0.985	≤ 120 °C
54H	1.451	1387 / 17.43	406.6 / 51.09	0.989	≤ 120 °C
30SH	1.114	1730 / 21.74	239.7 / 30.12	0.971	≤ 150 °C
33SH	1.165	1658 / 20.83	255 / 32.05	0.957	≤ 150 °C
35SH	1.214	1612 / 20.26	282.8 / 35.54	0.984	≤ 150 °C
38SH	1.251	1628 / 20.46	300 / 37.7	0.988	≤ 150 °C
40SH	1.278	1650 / 20.73	313.1 / 39.35	0.989	≤ 150 °C
42SH	1.317	1605 / 20.17	333 / 41.85	0.989	≤ 150 °C
45SH	1.337	1682 / 21.13	343.7 / 43.19	0.995	≤ 150 °C
48SH	1.371	1685 / 21.17	363.4 / 45.67	0.978	≤ 150 °C
50SH	1.410	1650 / 20.73	384.4 / 48.3	0.987	≤ 150 °C
52SH	1.423	1603 / 20.14	392.4 / 49.31	0.978	≤ 150 °C
28UH	1.042	2017 / 25.34	213.8 / 26.86	0.970	≤ 180 °C
33UH	1.163	2033 / 25.55	262.5 / 32.98	0.960	≤ 180 °C
35UH	1.192	2021 / 25.4	275.8 / 34.66	0.961	≤ 180 °C
38UH	1.251	2035 / 25.57	304.2 / 38.22	0.969	≤ 180 °C
40UH	1.272	2014 / 25.31	316 / 39.71	0.976	≤ 180 °C
42UH	1.298	2018 / 25.36	327.4 / 41.14	0.978	≤ 180 °C
45UH	1.339	2009 / 25.25	347.2 / 43.63	0.964	≤ 180 °C
48UH	1.395	2020 / 25.38	373.2 / 46.9	0.966	≤ 180 °C
50UH	1.400	2008 / 25.23	382.1 / 48.01	0.952	≤ 180 °C
52UH	1.430	2028 / 25.48	391.9 / 49.24	0.965	≤ 180 °C
30EH	1.095	2418 / 30.39	231.9 / 29.14	0.929	≤ 200 °C
33EH	1.150	2436 / 30.61	255.2 / 32.07	0.928	≤ 200 °C
35EH	1.200	2413 / 30.32	278 / 34.93	0.926	≤ 200 °C
45EH	1.340	2422 / 30.43	343.3 / 43.14	0.926	≤ 200 °C
CN33Ce	1.171	995.5 / 12.51	263.6 / 33.12	0.982	≤ 80 °C
CN52Ce	1.433	1004 / 12.62	391.2 / 49.16	0.986	≤ 80 °C
CN54Ce	1.458	961.3 / 12.08	406.4 / 51.07	0.967	≤ 80 °C
C35MCe	1.237	1124 / 14.12	281.8 / 35.41	0.977	≤ 100 °C
C45MCe	1.344	1162 / 14.6	344.3 / 43.27	0.962	≤ 100 °C
33MTT	1.167	1198 / 15.05	262.9 / 33.03	0.984	≤ 100 °C
38HTT	1.263	1531 / 19.24	307.8 / 38.68	0.987	≤ 120 °C
42HTT	1.309	1562 / 19.63	332.3 / 41.76	0.983	≤ 120 °C
45HTT	1.354	1517 / 19.07	354.6 / 44.55	0.978	≤ 120 °C
48HTT	1.421	1435 / 18.03	385.3 / 48.42	0.988	≤ 120 °C
50HTT	1.404	1519 / 19.09	382.1 / 48.02	0.980	≤ 120 °C
52HTT	1.426	1514 / 19.03	391.1 / 49.15	0.980	≤ 120 °C
35SHTT	1.193	1829 / 22.98	275.4 / 34.61	0.976	≤ 150 °C
38SHTT	1.244	1784 / 22.42	294.5 / 37.01	0.969	≤ 150 °C
48SHTT	1.388	1818 / 22.84	372.6 / 46.82	0.987	≤ 150 °C

N series — standard coercivity (≤ 80 °C)

N35 sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — N35
N35 measured at 20 °C: Br 1.189 T (11.89 kGs), HcJ 1033 kA/m (12.97 kOe), (BH)max 275 kJ/m³ (34.56 MGOe), Hk/HcJ 0.970.
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N40 sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — N40
N40 measured at 20 °C: Br 1.267 T (12.67 kGs), HcJ 1040 kA/m (13.07 kOe), (BH)max 312.4 kJ/m³ (39.25 MGOe), Hk/HcJ 0.984.
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N42 sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — N42
N42 measured at 20 °C: Br 1.307 T (13.07 kGs), HcJ 1025 kA/m (12.88 kOe), (BH)max 319.4 kJ/m³ (40.14 MGOe), Hk/HcJ 0.960.
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N45 sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — N45
N45 measured at 20 °C: Br 1.365 T (13.65 kGs), HcJ 1047 kA/m (13.15 kOe), (BH)max 361.7 kJ/m³ (45.45 MGOe), Hk/HcJ 0.990.
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N48 sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — N48
N48 measured at 20 °C: Br 1.384 T (13.84 kGs), HcJ 1012 kA/m (12.72 kOe), (BH)max 364.6 kJ/m³ (45.82 MGOe), Hk/HcJ 0.987.
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N50 sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — N50
N50 measured at 20 °C: Br 1.403 T (14.03 kGs), HcJ 1099 kA/m (13.8 kOe), (BH)max 377.4 kJ/m³ (47.42 MGOe), Hk/HcJ 0.979.
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N52 sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — N52
N52 measured at 20 °C: Br 1.451 T (14.51 kGs), HcJ 1111 kA/m (13.96 kOe), (BH)max 390.6 kJ/m³ (49.08 MGOe), Hk/HcJ 0.988.
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N56 sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — N56
N56 measured at 20 °C: Br 1.485 T (14.85 kGs), HcJ 1034 kA/m (12.99 kOe), (BH)max 423.1 kJ/m³ (53.17 MGOe), Hk/HcJ 0.979.
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M series — medium coercivity (≤ 100 °C)

35M sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 35M
35M measured at 20 °C: Br 1.207 T (12.07 kGs), HcJ 1177 kA/m (14.79 kOe), (BH)max 279.7 kJ/m³ (35.15 MGOe), Hk/HcJ 0.987.
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38M sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 38M
38M measured at 20 °C: Br 1.249 T (12.49 kGs), HcJ 1170 kA/m (14.7 kOe), (BH)max 297.4 kJ/m³ (37.37 MGOe), Hk/HcJ 0.978.
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42M sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 42M
42M measured at 20 °C: Br 1.308 T (13.08 kGs), HcJ 1116 kA/m (14.02 kOe), (BH)max 332.7 kJ/m³ (41.81 MGOe), Hk/HcJ 1.001.
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45M sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 45M
45M measured at 20 °C: Br 1.350 T (13.50 kGs), HcJ 1183 kA/m (14.87 kOe), (BH)max 345.7 kJ/m³ (43.44 MGOe), Hk/HcJ 0.985.
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48M sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 48M
48M measured at 20 °C: Br 1.387 T (13.87 kGs), HcJ 1171 kA/m (14.71 kOe), (BH)max 367.9 kJ/m³ (46.23 MGOe), Hk/HcJ 0.983.
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50M sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 50M
50M measured at 20 °C: Br 1.402 T (14.02 kGs), HcJ 1171 kA/m (14.71 kOe), (BH)max 374.5 kJ/m³ (47.06 MGOe), Hk/HcJ 0.984.
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52M sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 52M
52M measured at 20 °C: Br 1.435 T (14.35 kGs), HcJ 1208 kA/m (15.18 kOe), (BH)max 393.3 kJ/m³ (49.42 MGOe), Hk/HcJ 0.980.
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54M sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 54M
54M measured at 20 °C: Br 1.469 T (14.69 kGs), HcJ 1153 kA/m (14.49 kOe), (BH)max 406.9 kJ/m³ (51.13 MGOe), Hk/HcJ 0.967.
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H series — high coercivity (≤ 120 °C)

33H sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 33H
33H measured at 20 °C: Br 1.153 T (11.53 kGs), HcJ 1385 kA/m (17.41 kOe), (BH)max 254.2 kJ/m³ (31.95 MGOe), Hk/HcJ 0.977.
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35H sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 35H
35H measured at 20 °C: Br 1.207 T (12.07 kGs), HcJ 1472 kA/m (18.5 kOe), (BH)max 282 kJ/m³ (35.44 MGOe), Hk/HcJ 0.972.
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40H sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 40H
40H measured at 20 °C: Br 1.269 T (12.69 kGs), HcJ 1345 kA/m (16.9 kOe), (BH)max 313.5 kJ/m³ (39.4 MGOe), Hk/HcJ 0.946.
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42H sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 42H
42H measured at 20 °C: Br 1.303 T (13.03 kGs), HcJ 1419 kA/m (17.83 kOe), (BH)max 325.9 kJ/m³ (40.95 MGOe), Hk/HcJ 0.990.
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45H sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 45H
45H measured at 20 °C: Br 1.344 T (13.44 kGs), HcJ 1421 kA/m (17.85 kOe), (BH)max 345.9 kJ/m³ (43.47 MGOe), Hk/HcJ 0.988.
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48H sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 48H
48H measured at 20 °C: Br 1.377 T (13.77 kGs), HcJ 1436 kA/m (18.04 kOe), (BH)max 367.9 kJ/m³ (46.23 MGOe), Hk/HcJ 0.971.
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50H sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 50H
50H measured at 20 °C: Br 1.423 T (14.23 kGs), HcJ 1473 kA/m (18.51 kOe), (BH)max 387.2 kJ/m³ (48.65 MGOe), Hk/HcJ 0.988.
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52H sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 52H
52H measured at 20 °C: Br 1.429 T (14.29 kGs), HcJ 1475 kA/m (18.53 kOe), (BH)max 393.3 kJ/m³ (49.42 MGOe), Hk/HcJ 0.985.
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54H sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 54H
54H measured at 20 °C: Br 1.451 T (14.51 kGs), HcJ 1387 kA/m (17.43 kOe), (BH)max 406.6 kJ/m³ (51.09 MGOe), Hk/HcJ 0.989.
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SH series — super-high coercivity (≤ 150 °C)

30SH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 30SH
30SH measured at 20 °C: Br 1.114 T (11.14 kGs), HcJ 1730 kA/m (21.74 kOe), (BH)max 239.7 kJ/m³ (30.12 MGOe), Hk/HcJ 0.971.
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33SH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 33SH
33SH measured at 20 °C: Br 1.165 T (11.65 kGs), HcJ 1658 kA/m (20.83 kOe), (BH)max 255 kJ/m³ (32.05 MGOe), Hk/HcJ 0.957.
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35SH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 35SH
35SH measured at 20 °C: Br 1.214 T (12.14 kGs), HcJ 1612 kA/m (20.26 kOe), (BH)max 282.8 kJ/m³ (35.54 MGOe), Hk/HcJ 0.984.
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38SH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 38SH
38SH measured at 20 °C: Br 1.251 T (12.51 kGs), HcJ 1628 kA/m (20.46 kOe), (BH)max 300 kJ/m³ (37.7 MGOe), Hk/HcJ 0.988.
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40SH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 40SH
40SH measured at 20 °C: Br 1.278 T (12.78 kGs), HcJ 1650 kA/m (20.73 kOe), (BH)max 313.1 kJ/m³ (39.35 MGOe), Hk/HcJ 0.989.
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42SH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 42SH
42SH measured at 20 °C: Br 1.317 T (13.17 kGs), HcJ 1605 kA/m (20.17 kOe), (BH)max 333 kJ/m³ (41.85 MGOe), Hk/HcJ 0.989.
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45SH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 45SH
45SH measured at 20 °C: Br 1.337 T (13.37 kGs), HcJ 1682 kA/m (21.13 kOe), (BH)max 343.7 kJ/m³ (43.19 MGOe), Hk/HcJ 0.995.
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48SH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 48SH
48SH measured at 20 °C: Br 1.371 T (13.71 kGs), HcJ 1685 kA/m (21.17 kOe), (BH)max 363.4 kJ/m³ (45.67 MGOe), Hk/HcJ 0.978.
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50SH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 50SH
50SH measured at 20 °C: Br 1.410 T (14.10 kGs), HcJ 1650 kA/m (20.73 kOe), (BH)max 384.4 kJ/m³ (48.3 MGOe), Hk/HcJ 0.987.
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52SH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 52SH
52SH measured at 20 °C: Br 1.423 T (14.23 kGs), HcJ 1603 kA/m (20.14 kOe), (BH)max 392.4 kJ/m³ (49.31 MGOe), Hk/HcJ 0.978.
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UH series — ultra-high coercivity (≤ 180 °C)

28UH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 28UH
28UH measured at 20 °C: Br 1.042 T (10.42 kGs), HcJ 2017 kA/m (25.34 kOe), (BH)max 213.8 kJ/m³ (26.86 MGOe), Hk/HcJ 0.970.
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33UH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 33UH
33UH measured at 20 °C: Br 1.163 T (11.63 kGs), HcJ 2033 kA/m (25.55 kOe), (BH)max 262.5 kJ/m³ (32.98 MGOe), Hk/HcJ 0.960.
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35UH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 35UH
35UH measured at 20 °C: Br 1.192 T (11.92 kGs), HcJ 2021 kA/m (25.4 kOe), (BH)max 275.8 kJ/m³ (34.66 MGOe), Hk/HcJ 0.961.
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38UH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 38UH
38UH measured at 20 °C: Br 1.251 T (12.51 kGs), HcJ 2035 kA/m (25.57 kOe), (BH)max 304.2 kJ/m³ (38.22 MGOe), Hk/HcJ 0.969.
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40UH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 40UH
40UH measured at 20 °C: Br 1.272 T (12.72 kGs), HcJ 2014 kA/m (25.31 kOe), (BH)max 316 kJ/m³ (39.71 MGOe), Hk/HcJ 0.976.
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42UH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 42UH
42UH measured at 20 °C: Br 1.298 T (12.98 kGs), HcJ 2018 kA/m (25.36 kOe), (BH)max 327.4 kJ/m³ (41.14 MGOe), Hk/HcJ 0.978.
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45UH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 45UH
45UH measured at 20 °C: Br 1.339 T (13.39 kGs), HcJ 2009 kA/m (25.25 kOe), (BH)max 347.2 kJ/m³ (43.63 MGOe), Hk/HcJ 0.964.
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48UH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 48UH
48UH measured at 20 °C: Br 1.395 T (13.95 kGs), HcJ 2020 kA/m (25.38 kOe), (BH)max 373.2 kJ/m³ (46.9 MGOe), Hk/HcJ 0.966.
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50UH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 50UH
50UH measured at 20 °C: Br 1.400 T (14.00 kGs), HcJ 2008 kA/m (25.23 kOe), (BH)max 382.1 kJ/m³ (48.01 MGOe), Hk/HcJ 0.952.
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52UH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 52UH
52UH measured at 20 °C: Br 1.430 T (14.30 kGs), HcJ 2028 kA/m (25.48 kOe), (BH)max 391.9 kJ/m³ (49.24 MGOe), Hk/HcJ 0.965.
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EH series — extra-high coercivity (≤ 200 °C)

30EH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 30EH
30EH measured at 20 °C: Br 1.095 T (10.95 kGs), HcJ 2418 kA/m (30.39 kOe), (BH)max 231.9 kJ/m³ (29.14 MGOe), Hk/HcJ 0.929.
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33EH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 33EH
33EH measured at 20 °C: Br 1.150 T (11.50 kGs), HcJ 2436 kA/m (30.61 kOe), (BH)max 255.2 kJ/m³ (32.07 MGOe), Hk/HcJ 0.928.
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35EH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 35EH
35EH measured at 20 °C: Br 1.200 T (12.00 kGs), HcJ 2413 kA/m (30.32 kOe), (BH)max 278 kJ/m³ (34.93 MGOe), Hk/HcJ 0.926.
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45EH sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 45EH
45EH measured at 20 °C: Br 1.340 T (13.40 kGs), HcJ 2422 kA/m (30.43 kOe), (BH)max 343.3 kJ/m³ (43.14 MGOe), Hk/HcJ 0.926.
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Cerium-containing grades (C prefix)

Part of the neodymium/praseodymium is replaced by cerium, a cheaper and more plentiful rare earth. Br and (BH)max stay close to the standard grade, HcJ runs a little lower — a cost-saving option for consumer products and motors with moderate temperature demands.

CN33 sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — CN33
CN33 measured at 20 °C: Br 1.171 T (11.71 kGs), HcJ 995.5 kA/m (12.51 kOe), (BH)max 263.6 kJ/m³ (33.12 MGOe), Hk/HcJ 0.982.
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CN52 sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — CN52
CN52 measured at 20 °C: Br 1.433 T (14.33 kGs), HcJ 1004 kA/m (12.62 kOe), (BH)max 391.2 kJ/m³ (49.16 MGOe), Hk/HcJ 0.986.
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CN54 sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — CN54
CN54 measured at 20 °C: Br 1.458 T (14.58 kGs), HcJ 961.3 kA/m (12.08 kOe), (BH)max 406.4 kJ/m³ (51.07 MGOe), Hk/HcJ 0.967.
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C35M sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — C35M
C35M measured at 20 °C: Br 1.237 T (12.37 kGs), HcJ 1124 kA/m (14.12 kOe), (BH)max 281.8 kJ/m³ (35.41 MGOe), Hk/HcJ 0.977.
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C45M sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — C45M
C45M measured at 20 °C: Br 1.344 T (13.44 kGs), HcJ 1162 kA/m (14.6 kOe), (BH)max 344.3 kJ/m³ (43.27 MGOe), Hk/HcJ 0.962.
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Non-standard coercivity grades (T suffix)

T grades sit between two coercivity series: e.g. the SH class is graded at HcJ of about 20 kOe and above and UH at about 25 kOe and above, while 35SHT targets 22–23 kOe; the exact specification is agreed per order. They give extra temperature margin over the base series without paying for the next series up.

33MT sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 33MT
33MT measured at 20 °C: Br 1.167 T (11.67 kGs), HcJ 1198 kA/m (15.05 kOe), (BH)max 262.9 kJ/m³ (33.03 MGOe), Hk/HcJ 0.984.
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38HT sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 38HT
38HT measured at 20 °C: Br 1.263 T (12.63 kGs), HcJ 1531 kA/m (19.24 kOe), (BH)max 307.8 kJ/m³ (38.68 MGOe), Hk/HcJ 0.987.
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42HT sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 42HT
42HT measured at 20 °C: Br 1.309 T (13.09 kGs), HcJ 1562 kA/m (19.63 kOe), (BH)max 332.3 kJ/m³ (41.76 MGOe), Hk/HcJ 0.983.
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45HT sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 45HT
45HT measured at 20 °C: Br 1.354 T (13.54 kGs), HcJ 1517 kA/m (19.07 kOe), (BH)max 354.6 kJ/m³ (44.55 MGOe), Hk/HcJ 0.978.
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48HT sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 48HT
48HT measured at 20 °C: Br 1.421 T (14.21 kGs), HcJ 1435 kA/m (18.03 kOe), (BH)max 385.3 kJ/m³ (48.42 MGOe), Hk/HcJ 0.988.
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50HT sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 50HT
50HT measured at 20 °C: Br 1.404 T (14.04 kGs), HcJ 1519 kA/m (19.09 kOe), (BH)max 382.1 kJ/m³ (48.02 MGOe), Hk/HcJ 0.980.
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52HT sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 52HT
52HT measured at 20 °C: Br 1.426 T (14.26 kGs), HcJ 1514 kA/m (19.03 kOe), (BH)max 391.1 kJ/m³ (49.15 MGOe), Hk/HcJ 0.980.
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35SHT sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 35SHT
35SHT measured at 20 °C: Br 1.193 T (11.93 kGs), HcJ 1829 kA/m (22.98 kOe), (BH)max 275.4 kJ/m³ (34.61 MGOe), Hk/HcJ 0.976.
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38SHT sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 38SHT
38SHT measured at 20 °C: Br 1.244 T (12.44 kGs), HcJ 1784 kA/m (22.42 kOe), (BH)max 294.5 kJ/m³ (37.01 MGOe), Hk/HcJ 0.969.
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48SHT sintered NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — 48SHT
48SHT measured at 20 °C: Br 1.388 T (13.88 kGs), HcJ 1818 kA/m (22.84 kOe), (BH)max 372.6 kJ/m³ (46.82 MGOe), Hk/HcJ 0.987.
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Variable-temperature demagnetization curves

Each set is one sample measured at rising temperatures; these samples are from different lots than the 20 °C curves above, so their 20 °C values differ slightly. Br falls slowly (about −0.10 to −0.12 %/°C) while HcJ falls fast (about −0.4 to −0.8 %/°C), so the J-H knee moves towards the origin. As a first check, the worst-case working point at that temperature should stay above the knee with some margin; final design still needs a calculation for the actual geometry and load.

N52 sintered NdFeB demagnetization curves at 20/80 °C (measured)
Temp. (°C) Br (kGs) HcJ (kOe) (BH)max (MGOe)
20 14.45 14.23 50.53
80 13.57 7.777 43.86
Average coefficients 20–80 °C: α(Br) -0.101 %/°C, β(HcJ) -0.756 %/°C.

Temp. (°C)	Br (kGs)	HcJ (kOe)	(BH)max (MGOe)
20	14.45	14.23	50.53
80	13.57	7.777	43.86

52M sintered NdFeB demagnetization curves at 20/80/100/120 °C (measured)
Temp. (°C) Br (kGs) HcJ (kOe) (BH)max (MGOe)
20 14.38 14.96 49.95
80 13.54 8.417 43.8
100 13.17 6.827 41.07
120 12.78 5.483 37.37
Average coefficients 20–120 °C: α(Br) -0.111 %/°C, β(HcJ) -0.633 %/°C.

Temp. (°C)	Br (kGs)	HcJ (kOe)	(BH)max (MGOe)
20	14.38	14.96	49.95
80	13.54	8.417	43.8
100	13.17	6.827	41.07
120	12.78	5.483	37.37

45H sintered NdFeB demagnetization curves at 20/80/100/120 °C (measured)
Temp. (°C) Br (kGs) HcJ (kOe) (BH)max (MGOe)
20 13.45 17.14 43.7
80 12.59 9.688 37.8
100 12.25 7.873 35.69
120 11.87 6.379 33.28
Average coefficients 20–120 °C: α(Br) -0.117 %/°C, β(HcJ) -0.628 %/°C.

Temp. (°C)	Br (kGs)	HcJ (kOe)	(BH)max (MGOe)
20	13.45	17.14	43.7
80	12.59	9.688	37.8
100	12.25	7.873	35.69
120	11.87	6.379	33.28

48H sintered NdFeB demagnetization curves at 20/60/80/100/120 °C (measured)
Temp. (°C) Br (kGs) HcJ (kOe) (BH)max (MGOe)
20 13.75 17.45 45.82
60 13.23 12.42 41.93
80 12.89 10.34 39.71
100 12.55 8.563 37.48
120 12.17 7.009 35.03
Average coefficients 20–120 °C: α(Br) -0.115 %/°C, β(HcJ) -0.598 %/°C.

Temp. (°C)	Br (kGs)	HcJ (kOe)	(BH)max (MGOe)
20	13.75	17.45	45.82
60	13.23	12.42	41.93
80	12.89	10.34	39.71
100	12.55	8.563	37.48
120	12.17	7.009	35.03

52H sintered NdFeB demagnetization curves at 20/60/80/100/120 °C (measured)
Temp. (°C) Br (kGs) HcJ (kOe) (BH)max (MGOe)
20 14.3 17.71 49.61
60 13.8 12.47 45.79
80 13.47 10.31 43.49
100 13.1 8.39 40.95
120 12.73 6.784 38.35
Average coefficients 20–120 °C: α(Br) -0.110 %/°C, β(HcJ) -0.617 %/°C.

Temp. (°C)	Br (kGs)	HcJ (kOe)	(BH)max (MGOe)
20	14.3	17.71	49.61
60	13.8	12.47	45.79
80	13.47	10.31	43.49
100	13.1	8.39	40.95
120	12.73	6.784	38.35

42SH sintered NdFeB demagnetization curves at 20/100/120/150 °C (measured)
Temp. (°C) Br (kGs) HcJ (kOe) (BH)max (MGOe)
20 13.08 21.9 41.65
100 12 11.71 34.6
120 11.65 9.707 32.48
150 11.07 7.087 29.13
Average coefficients 20–150 °C: α(Br) -0.118 %/°C, β(HcJ) -0.520 %/°C.

Temp. (°C)	Br (kGs)	HcJ (kOe)	(BH)max (MGOe)
20	13.08	21.9	41.65
100	12	11.71	34.6
120	11.65	9.707	32.48
150	11.07	7.087	29.13

48UH sintered NdFeB demagnetization curves at 20/120/150/180 °C (measured)
Temp. (°C) Br (kGs) HcJ (kOe) (BH)max (MGOe)
20 14.03 25.35 48.01
120 12.38 13.63 37.53
150 12.02 9.991 34.47
180 11.29 8.068 30.09
Average coefficients 20–180 °C: α(Br) -0.122 %/°C, β(HcJ) -0.426 %/°C.

Temp. (°C)	Br (kGs)	HcJ (kOe)	(BH)max (MGOe)
20	14.03	25.35	48.01
120	12.38	13.63	37.53
150	12.02	9.991	34.47
180	11.29	8.068	30.09

Questions about these curves

What is the measured Br and HcJ of N52 sintered NdFeB?

An AIC N52 production lot measured at 20 °C gave Br 1.451 T (14.51 kGs), HcJ 1111 kA/m (13.96 kOe) and (BH)max 390.6 kJ/m³ (49.08 MGOe), with squareness Hk/HcJ 0.988. At 80 °C a different N52 sample (variable-temperature test) kept Br 13.57 kGs but HcJ dropped to 7.78 kOe.

How much does sintered NdFeB lose at high temperature?

In AIC's variable-temperature tests Br fell about 0.10–0.12 %/°C (0.101–0.122 across these samples) and HcJ about 0.4–0.8 %/°C. For example 52H went from 14.30 kGs / 17.71 kOe at 20 °C to 12.73 kGs / 6.78 kOe at 120 °C, and 48UH from 14.03 kGs / 25.35 kOe at 20 °C to 11.29 kGs / 8.07 kOe at 180 °C.

Which grade suffix should I choose for a motor running at 150 °C?

As a selection guide, start with the SH series (graded at HcJ of about 1592 kA/m, 20 kOe, and above at 20 °C); AIC's 42SH sample still had HcJ 7.09 kOe at 150 °C. If the magnet is thin or sees strong reverse field, step up to UH. Send us the operating point and we will check it against the curve.

Are these values guaranteed?

No. Each curve is one production lot's test result. The grade table on the sintered NdFeB product page gives typical values; specification limits are agreed per order, and the test report of your own lot is available on request.

Need the curve for your lot or temperature?

We can supply the hysteresisgraph report for your lot and measure at your working temperature.

Request a test report Sintered NdFeB grades & specs

How to read the curves

All measured grades at 20 °C

N series — standard coercivity (≤ 80 °C)

N35

N40

N42

N45

N48

N50

N52

N56

M series — medium coercivity (≤ 100 °C)

35M

38M

42M

45M

48M

50M

52M

54M

H series — high coercivity (≤ 120 °C)

33H

35H

40H

42H

45H

48H

50H

52H

54H

SH series — super-high coercivity (≤ 150 °C)

30SH

33SH

35SH

38SH

40SH

42SH

45SH

48SH

50SH

52SH

UH series — ultra-high coercivity (≤ 180 °C)

28UH

33UH

35UH

38UH

40UH

42UH

45UH

48UH

50UH

52UH

EH series — extra-high coercivity (≤ 200 °C)

30EH

33EH

35EH

45EH

Cerium-containing grades (C prefix)

CN33

CN52

CN54

C35M

C45M

Non-standard coercivity grades (T suffix)

33MT

38HT

42HT

45HT

48HT

50HT

52HT

35SHT

38SHT

48SHT

Variable-temperature demagnetization curves

N52 sintered NdFeB demagnetization curves at 20/80 °C (measured)

52M sintered NdFeB demagnetization curves at 20/80/100/120 °C (measured)

45H sintered NdFeB demagnetization curves at 20/80/100/120 °C (measured)

48H sintered NdFeB demagnetization curves at 20/60/80/100/120 °C (measured)

52H sintered NdFeB demagnetization curves at 20/60/80/100/120 °C (measured)