Test data

Molded NdFeB Demagnetization Curves (Measured, GPM-2 to GPM-13L)

Every curve on this page comes from a hysteresisgraph (AMT-4) test report of an AIC molded NdFeB sample: a Ø10 mm cylinder measured at 20 °C (GPM-8LL and GPM-10L at 22 °C). The J-H and B-H lines are traced from the plot data stored in each report, the B×H curve is computed from the B-H line, and every number in the results box is copied from the report's own results panel (T and kA/m values converted from the report's kGs and kOe).

The values are single-sample test results, not guaranteed minimums. The grade table on the product page lists typical ranges for 13 standard grades; the other 12 grades measured here are not in that table yet — ask us about them.

How to read the curves

The dark line is the intrinsic J-H curve. Where it crosses the H axis is HcJ: at the same temperature, a higher HcJ resists stronger reverse fields. HcJ falls as the magnet heats up, so select for temperature by the rated max temperature and a curve at that temperature, not by the room-temperature HcJ alone.
The blue line is the normal B-H curve. Its value at H = 0 is Br (remanence); where it reaches the H axis is HcB. On these molded grades it is almost straight all the way down.
The orange curve, read on the top (MGOe) scale, is the energy product B×H. Its peak is (BH)max, marked on the B-H line.
Hk/HcJ (squareness) — Hk is the field at which J has fallen to 90 % of Br. Molded NdFeB has a rounded knee, so Hk/HcJ is about 0.27–0.50 here, against 0.92–1.00 for sintered NdFeB. Keep the working point well clear of the knee, not just inside HcJ.

All measured grades

Click a grade button to see its curve. Values are at 20 °C unless marked 22 °C. Rated max temperature comes from the product-page grade table, not from this test; grades marked “not in table” have no published rating yet.

Grade	Br (T)	HcB (kA/m / kOe)	HcJ (kA/m / kOe)	(BH)max (kJ/m³ / MGOe)	Hk/HcJ	Rated max temp. (product table)
GPM-2	0.371	224 / 2.8137	389 / 4.8929	21.8 / 2.742	0.295	≤ 120 °C
GPM-2H	0.410	245 / 3.0816	409 / 5.1336	26.2 / 3.2907	0.291	not in table
GPM-2i	0.336	200 / 2.5111	372 / 4.6804	17.7 / 2.2199	0.268	not in table
GPM-4	0.469	284 / 3.5722	426 / 5.3519	34.1 / 4.2908	0.313	≤ 120 °C
GPM-4H	0.481	304 / 3.8246	459 / 5.773	37.3 / 4.688	0.357	not in table
GPM-4i	0.450	266 / 3.3431	414 / 5.2021	31 / 3.8993	0.291	not in table
GPM-6	0.558	348 / 4.3719	529 / 6.6456	49 / 6.1638	0.318	≤ 150 °C
GPM-6H	0.569	361 / 4.5316	576 / 7.2342	51.8 / 6.5046	0.321	not in table
GPM-6i	0.519	315 / 3.9602	486 / 6.1123	41.5 / 5.2104	0.288	not in table
GPM-8	0.634	424 / 5.3238	686 / 8.6246	67 / 8.4142	0.392	≤ 160 °C
GPM-8H	0.623	444 / 5.574	1310 / 16.459	68 / 8.5493	0.318	≤ 180 °C
GPM-8SR	0.684	460 / 5.7749	941 / 11.827	77.6 / 9.754	0.302	≤ 180 °C
GPM-8L	0.657	428 / 5.3769	703 / 8.8319	71 / 8.9231	0.356	≤ 160 °C
GPM-8LL22 °C	0.689	405 / 5.0916	553 / 6.9503	73.7 / 9.2572	0.340	not in table
GPM-8i	0.607	372 / 4.6798	525 / 6.6015	57.8 / 7.2629	0.338	not in table
GPM-10	0.707	454 / 5.7064	752 / 9.4497	81.1 / 10.188	0.330	≤ 160 °C
GPM-10H	0.712	462 / 5.8064	759 / 9.5389	82.9 / 10.417	0.345	≤ 160 °C
GPM-10SR	0.709	482 / 6.0536	975 / 12.258	84.4 / 10.604	0.327	not in table
GPM-10L22 °C	0.722	429 / 5.3944	574 / 7.2088	83 / 10.427	0.371	not in table
GPM-10i	0.687	452 / 5.6777	713 / 8.9637	77.3 / 9.7187	0.368	not in table
GPM-10iL	0.689	411 / 5.1685	576 / 7.2411	73.5 / 9.2387	0.333	not in table
GPM-12	0.741	508 / 6.3799	766 / 9.6316	94.3 / 11.851	0.495	≤ 160 °C
GPM-12H	0.756	501 / 6.2925	760 / 9.5565	94.8 / 11.917	0.407	≤ 160 °C
GPM-12L	0.762	434 / 5.4556	569 / 7.1488	89.4 / 11.239	0.370	≤ 150 °C
GPM-13L	0.781	444 / 5.5738	571 / 7.1779	94.7 / 11.896	0.389	≤ 150 °C

GPM-2 grades

GPM-2 molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-2
GPM-2 measured at 20 °C: Br 0.371 T (3.71 kGs), HcB 224 kA/m (2.8137 kOe), HcJ 389 kA/m (4.8929 kOe), (BH)max 21.8 kJ/m³ (2.742 MGOe), Hk/HcJ 0.295.
Product-page grade table: max working temperature 120 °C.

GPM-2H molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-2H
GPM-2H measured at 20 °C: Br 0.410 T (4.10 kGs), HcB 245 kA/m (3.0816 kOe), HcJ 409 kA/m (5.1336 kOe), (BH)max 26.2 kJ/m³ (3.2907 MGOe), Hk/HcJ 0.291.
Not in the product-page grade table — ask us for the specification.

GPM-2i molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-2i
GPM-2i measured at 20 °C: Br 0.336 T (3.36 kGs), HcB 200 kA/m (2.5111 kOe), HcJ 372 kA/m (4.6804 kOe), (BH)max 17.7 kJ/m³ (2.2199 MGOe), Hk/HcJ 0.268.
Not in the product-page grade table — ask us for the specification.

GPM-4 grades

GPM-4 molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-4
GPM-4 measured at 20 °C: Br 0.469 T (4.69 kGs), HcB 284 kA/m (3.5722 kOe), HcJ 426 kA/m (5.3519 kOe), (BH)max 34.1 kJ/m³ (4.2908 MGOe), Hk/HcJ 0.313.
Product-page grade table: max working temperature 120 °C.

GPM-4H molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-4H
GPM-4H measured at 20 °C: Br 0.481 T (4.81 kGs), HcB 304 kA/m (3.8246 kOe), HcJ 459 kA/m (5.773 kOe), (BH)max 37.3 kJ/m³ (4.688 MGOe), Hk/HcJ 0.357.
Not in the product-page grade table — ask us for the specification.

GPM-4i molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-4i
GPM-4i measured at 20 °C: Br 0.450 T (4.50 kGs), HcB 266 kA/m (3.3431 kOe), HcJ 414 kA/m (5.2021 kOe), (BH)max 31 kJ/m³ (3.8993 MGOe), Hk/HcJ 0.291.
Not in the product-page grade table — ask us for the specification.

GPM-6 grades

GPM-6 molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-6
GPM-6 measured at 20 °C: Br 0.558 T (5.58 kGs), HcB 348 kA/m (4.3719 kOe), HcJ 529 kA/m (6.6456 kOe), (BH)max 49 kJ/m³ (6.1638 MGOe), Hk/HcJ 0.318.
Product-page grade table: max working temperature 150 °C.

GPM-6H molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-6H
GPM-6H measured at 20 °C: Br 0.569 T (5.69 kGs), HcB 361 kA/m (4.5316 kOe), HcJ 576 kA/m (7.2342 kOe), (BH)max 51.8 kJ/m³ (6.5046 MGOe), Hk/HcJ 0.321.
Not in the product-page grade table — ask us for the specification.

GPM-6i molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-6i
GPM-6i measured at 20 °C: Br 0.519 T (5.19 kGs), HcB 315 kA/m (3.9602 kOe), HcJ 486 kA/m (6.1123 kOe), (BH)max 41.5 kJ/m³ (5.2104 MGOe), Hk/HcJ 0.288.
Not in the product-page grade table — ask us for the specification.

GPM-8 grades

GPM-8 molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-8
GPM-8 measured at 20 °C: Br 0.634 T (6.34 kGs), HcB 424 kA/m (5.3238 kOe), HcJ 686 kA/m (8.6246 kOe), (BH)max 67 kJ/m³ (8.4142 MGOe), Hk/HcJ 0.392.
Product-page grade table: max working temperature 160 °C.

GPM-8H molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-8H
GPM-8H measured at 20 °C: Br 0.623 T (6.23 kGs), HcB 444 kA/m (5.574 kOe), HcJ 1310 kA/m (16.459 kOe), (BH)max 68 kJ/m³ (8.5493 MGOe), Hk/HcJ 0.318.
Product-page grade table: max working temperature 180 °C.

GPM-8SR molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-8SR
GPM-8SR measured at 20 °C: Br 0.684 T (6.84 kGs), HcB 460 kA/m (5.7749 kOe), HcJ 941 kA/m (11.827 kOe), (BH)max 77.6 kJ/m³ (9.754 MGOe), Hk/HcJ 0.302.
Product-page grade table: max working temperature 180 °C.

GPM-8L molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-8L
GPM-8L measured at 20 °C: Br 0.657 T (6.57 kGs), HcB 428 kA/m (5.3769 kOe), HcJ 703 kA/m (8.8319 kOe), (BH)max 71 kJ/m³ (8.9231 MGOe), Hk/HcJ 0.356.
Product-page grade table: max working temperature 160 °C.

GPM-8LL molded NdFeB demagnetization curve at 22 °C (B-H and J-H, measured) — GPM-8LL
GPM-8LL measured at 22 °C: Br 0.689 T (6.89 kGs), HcB 405 kA/m (5.0916 kOe), HcJ 553 kA/m (6.9503 kOe), (BH)max 73.7 kJ/m³ (9.2572 MGOe), Hk/HcJ 0.340.
Not in the product-page grade table — ask us for the specification.

GPM-8i molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-8i
GPM-8i measured at 20 °C: Br 0.607 T (6.07 kGs), HcB 372 kA/m (4.6798 kOe), HcJ 525 kA/m (6.6015 kOe), (BH)max 57.8 kJ/m³ (7.2629 MGOe), Hk/HcJ 0.338.
Not in the product-page grade table — ask us for the specification.

GPM-10 grades

GPM-10 molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-10
GPM-10 measured at 20 °C: Br 0.707 T (7.07 kGs), HcB 454 kA/m (5.7064 kOe), HcJ 752 kA/m (9.4497 kOe), (BH)max 81.1 kJ/m³ (10.188 MGOe), Hk/HcJ 0.330.
Product-page grade table: max working temperature 160 °C.

GPM-10H molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-10H
GPM-10H measured at 20 °C: Br 0.712 T (7.12 kGs), HcB 462 kA/m (5.8064 kOe), HcJ 759 kA/m (9.5389 kOe), (BH)max 82.9 kJ/m³ (10.417 MGOe), Hk/HcJ 0.345.
Product-page grade table: max working temperature 160 °C.

GPM-10SR molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-10SR
GPM-10SR measured at 20 °C: Br 0.709 T (7.09 kGs), HcB 482 kA/m (6.0536 kOe), HcJ 975 kA/m (12.258 kOe), (BH)max 84.4 kJ/m³ (10.604 MGOe), Hk/HcJ 0.327.
Not in the product-page grade table — ask us for the specification.

GPM-10L molded NdFeB demagnetization curve at 22 °C (B-H and J-H, measured) — GPM-10L
GPM-10L measured at 22 °C: Br 0.722 T (7.22 kGs), HcB 429 kA/m (5.3944 kOe), HcJ 574 kA/m (7.2088 kOe), (BH)max 83 kJ/m³ (10.427 MGOe), Hk/HcJ 0.371.
Not in the product-page grade table — ask us for the specification.

GPM-10i molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-10i
GPM-10i measured at 20 °C: Br 0.687 T (6.87 kGs), HcB 452 kA/m (5.6777 kOe), HcJ 713 kA/m (8.9637 kOe), (BH)max 77.3 kJ/m³ (9.7187 MGOe), Hk/HcJ 0.368.
Not in the product-page grade table — ask us for the specification.

GPM-10iL molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-10iL
GPM-10iL measured at 20 °C: Br 0.689 T (6.89 kGs), HcB 411 kA/m (5.1685 kOe), HcJ 576 kA/m (7.2411 kOe), (BH)max 73.5 kJ/m³ (9.2387 MGOe), Hk/HcJ 0.333.
Not in the product-page grade table — ask us for the specification.

GPM-12 / 13 grades

GPM-12 molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-12
GPM-12 measured at 20 °C: Br 0.741 T (7.41 kGs), HcB 508 kA/m (6.3799 kOe), HcJ 766 kA/m (9.6316 kOe), (BH)max 94.3 kJ/m³ (11.851 MGOe), Hk/HcJ 0.495.
Product-page grade table: max working temperature 160 °C.

GPM-12H molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-12H
GPM-12H measured at 20 °C: Br 0.756 T (7.56 kGs), HcB 501 kA/m (6.2925 kOe), HcJ 760 kA/m (9.5565 kOe), (BH)max 94.8 kJ/m³ (11.917 MGOe), Hk/HcJ 0.407.
Product-page grade table: max working temperature 160 °C.

GPM-12L molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-12L
GPM-12L measured at 20 °C: Br 0.762 T (7.62 kGs), HcB 434 kA/m (5.4556 kOe), HcJ 569 kA/m (7.1488 kOe), (BH)max 89.4 kJ/m³ (11.239 MGOe), Hk/HcJ 0.370.
Product-page grade table: max working temperature 150 °C.

GPM-13L molded NdFeB demagnetization curve at 20 °C (B-H and J-H, measured) — GPM-13L
GPM-13L measured at 20 °C: Br 0.781 T (7.81 kGs), HcB 444 kA/m (5.5738 kOe), HcJ 571 kA/m (7.1779 kOe), (BH)max 94.7 kJ/m³ (11.896 MGOe), Hk/HcJ 0.389.
Product-page grade table: max working temperature 150 °C.

Copyright and reuse

The charts and measurements on this page are published for reference. You may link to this page and quote individual values with attribution to AIC Engineering Ltd. Reproducing a chart, or copying the data into another publication, product, or dataset, requires written permission.

To request a license, contact us.

Questions about these curves

What are the measured Br and HcJ of GPM-12 molded NdFeB?

An AIC GPM-12 sample measured at 20 °C gave Br 0.741 T (7.41 kGs), HcB 508 kA/m (6.38 kOe), HcJ 766 kA/m (9.63 kOe) and (BH)max 94.3 kJ/m³ (11.85 MGOe), with Hk/HcJ 0.495. The highest energy product measured here is GPM-12H at 94.8 kJ/m³ (11.92 MGOe).

Which GPM sample on this page has the highest coercivity?

Among the 25 single-sample results on this page, GPM-8H is highest: HcJ 1310 kA/m (16.46 kOe), with Br 0.623 T. The GPM-10SR (975 kA/m, 12.26 kOe) and GPM-8SR (941 kA/m, 11.83 kOe) samples come next with a higher Br (about 0.68–0.71 T); the other samples measured 370–770 kA/m. One sample per grade shows where a grade sits, not its guaranteed range.

Why is the J-H knee of molded NdFeB so rounded?

Molded NdFeB is pressed from rapid-quenched NdFeB powder and a binder, and J falls gradually instead of holding flat and then dropping. On these reports Hk/HcJ is 0.27–0.50, while sintered NdFeB measures 0.92–1.00. In practice a molded magnet starts losing flux well before the field reaches HcJ, so check the worst-case working point against the curve, not just against HcJ.

Are these values guaranteed?

No. Each chart is one sample's test report. The grade table on the molded NdFeB product page gives typical ranges; specification limits are agreed per order, and we can test samples from your own lot.

Sintered NdFeB demagnetization curves

Need the curve for your lot or temperature?

We can measure samples from your lot and check your working point against the curve.

Request a test Molded NdFeB grades & specs

How to read the curves

All measured grades

GPM-2 grades

GPM-2

GPM-2H

GPM-2i

GPM-4 grades

GPM-4

GPM-4H

GPM-4i

GPM-6 grades

GPM-6

GPM-6H

GPM-6i

GPM-8 grades

GPM-8

GPM-8H

GPM-8SR

GPM-8L

GPM-8LL

GPM-8i

GPM-10 grades

GPM-10

GPM-10H

GPM-10SR

GPM-10L

GPM-10i

GPM-10iL

GPM-12 / 13 grades

GPM-12

GPM-12H

GPM-12L

GPM-13L