Technical capabilities

Magnet characteristics

Magnets have different magnetic and physical characteristics

Has a characteristic shape

What is important for the user is the "shape" of the magnet due to its magnetic characteristics.
latest《Rare earth magnet》Has the strongest residual magnetic flux density Br (related to attractive force) and coercive force bHc (related to demagnetization), so it is possible to reduce the size and flattening compared to other magnets.
Widely used before the war《Alnico magnet》Since the coercive force is small, the cross section of the magnet can be made small because the magnetic flux density between the magnetic poles is high as in rare earths (from the N pole to one side, and the shape becomes elongated for the above reasons. The advantage is stability against temperature changes. It's excellent.
《Ferrite magnet》Since the coercive force is large, the distance between the magnetic poles can be shortened.However, since the magnetic flux density is low, it is necessary to increase the cross-sectional area of ​​the magnet.Therefore, the shape is flat.

Magnetic properties and their physical properties

*See the table below for the magnetic properties of neodymium magnets and samarium-cobalt magnets by grade.

Typical magnet

Types of magnets rare earth Ferrite Alnico
Item unit Neodymium samarium
cobalt		 Isotropic anisotropy
dry		 anisotropy
Wet		 Alnico-5 Alnico-8
Residual magnetic flux density Br kG 12.4 10.5 2.2 3.6 4 12.7 8.8
mT 1,240 1,050 220 360 400 1,270 880
Holding force bHc kOe 11.6 8 1.9 3 3.3 0.65 1.47
kA / m 923 636 151 238 262 51 117
Maximum energy product
Bhmax		 MGOeMore 37 24 1 3 3.8 5.3 5.2
kJ / m3 294.5 191 8 23.9 30.2 42.2 41.4
Br temperature characteristics % / ℃ -0.12 -0.04 -0.18 -0.18 -0.18 -0.02 -0.01
Curie point ℃ 320 750 460 460 460 850 850
density g / cm3 7.4 8.3 4.8 4.8 4.9 7.3 7.3

BH curve of a typical magnet

rare earth

Item unit Neodymium Samarium cobalt
composition - Nd2・ Fe14・ B Sm2Co17
Molding method - Magnetic field molding Magnetic field molding
Residual magnetic flux density
Br		 mT 1210 to 1270 970 to 1020
kG 12.1 to 12.7 9.7 to 1.02
Coercive force
bHc		 kA / m 867 to 979 557 to 836
KOe 10.9 to 12.3 7 to 10.5
Coercive force
iHc		 kA / m ＞1353 716 to 1194
KOe ＞17 9 to 15
Maximum energy-product
(BH) max		 kJ / m3 278 to 310 175 to 199
MGOeMore 35 to 39 22 to 25
Temperature coefficient Br % / K -0.12 -0.04
Temperature coefficient iHc % / K -0.58 -0.03
Curie temperature
Tc		 K 593 1093
℃ 320 820
Recoil relative permeability
μrec		 - 1.05 1.05
density g / cm3 7.4 8.3
Mine strength Mpa 245 118
Kgf / mm2 25 12
Compression strength MPa 1050 500 to 519
Kgf / mm2 107 51 to 53
Tensile strength MPa 44 36
Kgf / mm2 4.5 3.6
specific heat J / (Kg ・ K) 0.50 × 103 034 × 103
cal / g ・ ℃ 0.12 0.08
硬度 HV 600 550
Coefficient of thermal expansion
〃		 ppm / K 5.5 to 7.5 8
Coefficient of thermal expansion
⊥		 ppm / K -3 ~ 0.5 11
JIS - REFe280 / 120 RECo160 / 70
MMPA - - -
Required magnetic field kA / m 2400 1990
KOe 30 25
Electrical resistivity nΩ ・ m 1.3 × 10-4 0.8 to 0.9

Ferrite

Item unit Isotropic Dry anisotropy Wet anisotropy
composition - BaO ・ XNUMXFeTwoO3 SrO ・ XNUMXFe2O3 SrO ・ XNUMXFe2O3
Molding method - Dry molding Dry magnetic field molding Wet magnetic field molding
Residual magnetic flux density
Br		 mT ≧ 200 310 to 360 380 to 400
kG ≧ 2.0 3.1 to 3.6 3.8 to 4.0
Coercive force
bHc		 kA / m 127 to 159 220 to 250 230 to 275
KOe 1.6 to 2.0 2.8 to 3.2 2.9 to 3.5
Coercive force
iHc		 kA / m 135 to 167 280 to 320 235 to 290
KOe 1.7 to 2.1 3.5 to 4.0 3.0 to 3.7
Maximum energy-product
(BH) max		 kJ / m3 6.3 to 9.5 20 to 24 27 to 32
MGOeMore 0.8 to 1.2 2.5 to 3.0 3.4 to 4.1
Temperature coefficient Br % / K -0.18 -0.18 -0.18
Temperature coefficient iHc % / K 0.22 0.27 to 0.42 0.27 to 0.42
Curie temperature
Tc		 K 723 733 733
℃ 450 460 460
Recoil relative permeability
μrec		 - 1.1 to 1.2 1.1 to 1.2 1.05 to 1.1
density g / cm3 4.8 4.9 4.9
Mine strength Mpa 29 to 68 49 to 88 49 to 88
Kgf / mm2 3 to 7 5 to 9 5 to 9
Compression strength MPa ＞686 ＞686 ＞686
Kgf / mm2 ＞70 ＞70 ＞70
Tensile strength MPa 19 to 49 19 to 49 19 to 49
Kgf / mm2 2 to 5 2 to 5 2 to 5
specific heat J / (Kg ・ K) 0.84 × 103 0.84 × 103 0.84 × 103
cal / g ・ ℃ 0.2 0.2 0.2
硬度 HV 530 530 530
Coefficient of thermal expansion
〃		 ppm / K 9.9 11 13
Coefficient of thermal expansion
⊥		 ppm / K 9.9 9 8
JIS - MPB-8 / 15D MPS-24 / 24D MPS-31 / 24W
MMPA - CERAMIC-1 CERAMIC-6 CERAMIC-8
Required magnetic field kA / m 800 800 800
KOe 10 10 10
Electrical resistivity nΩ ・ m ＞102 ＞102 ＞102

Alnico

Item unit Arnico XNUMX Arnico XNUMX Sintered alnico
composition - 8Al-14Ni-24Co-3Cu-Remaining Fe 7Al-15Ni-34Co-4Cu-Remaining Fe 8Al-14Ni-24Co-3Cu-Remaining Fe
Molding method - casting casting Wet magnetic field molding
Residual magnetic flux density
Br		 mT 1250 to 1300 830 to 900 1150
kG 12.5 to 13 8.3 to 9.0 11.5
Coercive force
bHc		 kA / m 47.7 to 52.5 110 to 123 50
KOe 0.60 to 0.66 1.38 to 1.55 0.63
Coercive force
iHc		 kA / m - - -
KOe
Maximum energy-product
(BH) max		 kJ / mm3 38.2 to 43.8 38.2 to 43.0 37
MGOeMore 4.8 to 5.5 4.8 to 5.4 4.6
Temperature coefficient Br % / K -0.02 -0.02 -0.02
Temperature coefficient iHc % / K - - -
Curie temperature
Tc		 K 1123 1123 1123
℃ 850 850 850
Recoil Permeability μrec - 3.6 3.6 3.6
density g / cm3 7.3 7.3 7.1
Mine strength Mpa 73.5 73.5 7.35
Kgf / mm2 7.5 7.5 7.5
Compression strength MPa - - -
Kgf / mm2
Tensile strength MPa 37.2 37.2 37.3
Kgf / mm2 3.8 3.8 3.8
specific heat J / (Kg ・ K) - - -
cal / g ・ ℃
硬度 HV 650 650 650
Coefficient of thermal expansion
〃		 ppm / K 11 11 11
Coefficient of thermal expansion
⊥		 ppm / K 11 11 11
JIS - AlNiCo37 / 5 AlNiCo38 / 11 AlNiCo S-34 / 5
MMPA - AlNiCO-5 AlNiCO-8 -
Required magnetic field kA / m 240 640 240
KOe 3.0 8.0 3.0
Electrical resistivity nΩ ・ m 4.7 × 102 4.7 × 102 47 × 102

Other Information

Item unit Neojibond Rubber anisotropy Rubber isotropic
composition - Nd2・ Fe14・ B - -
Molding method - Compression molding Injection Molding Roll molding Roll molding
Residual magnetic flux density
Br		 mT 640 to 710 640 to 710 230 1370
kG 6.4 to 7.1 6.4 to 7.1 2.3 1.37
Coercive force
bHc		 kA / m 570 to 760 410 to 620 135 102
KOe 5.7 to 7.6 4.1 to 6.2 1.7 1.28
Coercive force
iHc		 kA / m 370 to 470 250 to 400 - -
KOe 4.7 to 5.9 3.1 to 4.9
Maximum energy-product
(BH) max		 kJ / m3 60 to 96 28 to 60 8.8 4.0
MGOeMore 7.5 to 12.0 3.5 to 7.5 1.1 0.5
Temperature coefficient Br % / K -0.1 to -0.15 -0.1 to -0.15 -0.18 to -0.19 -0.18
Temperature coefficient iHc % / K - - 0.35 to 0.5 0.35
Curie temperature
Tc		 K #393 #393 #353 #353
℃ #120 #120 #80 #80
Recoil relative permeability
μrec		 - 1.1 to 1.2 1.1 to 1.2 1.03 to 1.07 1.03 to 1.07
density g / cm3 5.6 to 6.2 4.2 to 5.5 3.7 3.7
Mine strength Mpa 49.0 to 58.8 - - -
Kgf / mm3 5.0 to 6.0
Compression strength MPa - - - -
Kgf / mm3
Tensile strength MPa - 30000 666 392
Kgf / mm3 3061 68 40
specific heat J / (Kg ・ K) - - 0.7-0.8 × 103 0.7-0.8 × 103
cal / g ・ ℃ 0.167 to 0.191 0.167 to 0.191
硬度 HV 430 430 760 450
Coefficient of thermal expansion
〃		 ppm / K 13 to 15 50 - -
Coefficient of thermal expansion
⊥		 ppm / K 13 to 15 50 100 to 150 100 to 150
JIS - REFe63 / 64p REFe63 / 64p - -
MMPA - - - - -
Required magnetic field kA / m 2000 2000 800 800
KOe 25 25 10 10
Electrical resistivity nΩ ・ m 56 × 103 56 × 103 - -
 

List of Magnetic Properties by Grade of Neodymium Magnet

The approximate residual magnetic flux density (Br), coercivity (Hcb), intrinsic coercivity (Hcj), and maximum energy product ((BH)max) for each grade are shown in the table below.

grade Br
[mT]		 Hcb
[kA/m]		 Hcj
[kA/m]		 (BH)max
[kA/m3]
Min Max Min Max
N35 1170 1230 ≧ 860 ≧ 955 263 295
N38 1220 1270 ≧ 860 ≧ 955 287 310
N40 1250 1300 ≧ 860 ≧ 955 302 326
N42 1280 1340 ≧ 860 ≧ 955 318 350
N45 1320 1380 ≧ 860 ≧ 955 342 366
N48 1370 1420 ≧ 836 ≧ 955 358 390
N50 1390 1450 ≧ 836 ≧ 955 374 406
N52 1420 1480 ≧ 836 ≧ 955 382 422
N54 1440 1520 ≧ 836 ≧ 875 390 446
N55 1460 1520 ≧ 860 ≧ 876 413 446
N56 1460 1520 ≧ 836 ≧ 875 398 446
N58 1480 1550 ≧ 836 ≧ 875 406 462
N60 ≧ 1500   ≧ 836 ≧ 875 406 453
N30M 1080 1140 ≧ 756 ≧ 1114 223 255
N33M 1130 1190 ≧ 836 ≧ 1114 247 271
N35M 1170 1230 ≧ 860 ≧ 1114 263 295
N38M 1220 1270 ≧ 876 ≧ 1114 287 310
N40M 1250 1300 ≧ 910 ≧ 1114 302 326
N42M 1280 1340 ≧ 938 ≧ 1114 318 350
N45M 1320 1380 ≧ 971 ≧ 1114 342 366
N48M 1360 1430 ≧ 995 ≧ 1114 358 392
N50M 1390 1450 ≧ 1035 ≧ 1114 374 406
N52M 1420 1480 ≧ 995 ≧ 1114 382 422
N54M 1440 1500 ≧ 995 ≧ 1035 390 438
N55M 1450 1520 ≧ 971 ≧ 1035 398 446
N56M 1460 1500 ≧ 995 ≧ 1035 398 446
N58M 1470   ≧ 995 ≧ 1035 406 446
N30H 1080 1140 ≧ 756 ≧ 1353 223 255
N33H 1130 1190 ≧ 836 ≧ 1353 247 271
N35H 1170 1230 ≧ 868 ≧ 1353 263 295
N38H 1220 1270 ≧ 899 ≧ 1353 287 310
N40H 1250 1300 ≧ 923 ≧ 1353 302 326
N42H 1280 1340 ≧ 955 ≧ 1353 318 350
N45H 1320 1380 ≧ 971 ≧ 1353 342 366
N48H 1360 1430 ≧ 135 ≧ 1353 358 392
N50H 1390 1450 ≧ 1035 ≧ 1274 374 406
N52H 1420 1480 ≧ 1035 ≧ 1274 382 422
N54H 1440 1500 ≧ 1066 ≧ 1274 390 438
N56H 1450 1500 ≧ 1066 ≧ 1273 398 446
N30SH 1080 1150 ≧ 727 ≧ 1592 223 255
N33SH 1130 1190 ≧ 844 ≧ 1592 247 272
N35SH 1170 1230 ≧ 876 ≧ 1592 263 295
N38SH 1220 1270 ≧ 907 ≧ 1592 287 310
N40SH 1250 1300 ≧ 930 ≧ 1592 302 326
N42SH 1280 1340 ≧ 955 ≧ 1592 318 350
N45SH 1320 1380 ≧ 979 ≧ 1592 342 366
N48SH 1360 1430 ≧ 995 ≧ 1512 358 390
N50SH 1390 1450 ≧ 995 ≧ 1512 366 409
N52SH 1420 1470 ≧ 1050 ≧ 1512 382 424
N54SH ≧ 1440   ≧ 1066 ≧ 1512 390 430
N56SH 1450 1500 ≧ 1074 ≧ 1512 398 446
N35SHT 1180 1230 ≧ 884 ≧ 1831 263 287
N38SHT 1230 1260 ≧ 923 ≧ 1822 287 303
N40SHT 1260 1290 ≧ 955 ≧ 1806 302 318
N42SHT 1290 1330 ≧ 955 ≧ 1806 318 342
N45SHT 1330 1370 ≧ 987 ≧ 1783 334 366
N48SHT 1370 1410 ≧ 1019 ≧ 1671 358 390
N50SHT 1390 1430 ≧ 1035 ≧ 1671 374 406
N52SHT 1410 1460 ≧ 1050 ≧ 1568 390 422
N28UH 1020 1090 ≧ 764 ≧ 1990 207 231
N30UH 1080 1150 ≧ 756 ≧ 1990 223 255
N33UH 1130 1190 ≧ 844 ≧ 1990 247 271
N35UH 1170 1230 ≧ 860 ≧ 1990 263 295
N38UH 1220 1270 ≧ 876 ≧ 1990 287 310
N40UH 1250 1300 ≧ 912 ≧ 1990 302 326
N42UH 1270 1340 ≧ 938 ≧ 1990 310 350
N44UH 1320 1360 ≧ 995 ≧ 1990 334 358
N45UH 1320 1380 ≧ 976 ≧ 1910 338 366
N48UH 1360 1410 ≧ 995 ≧ 1910 358 390
N50UH 1390 1430 ≧ 1035 ≧ 1910 374 406
N52UH 1420 1460 ≧ 1050 ≧ 1910 382 422
N54UH ≧ 1430   ≧ 1066 ≧ 1910 390 430
N28EH 1040 1090 ≧ 780 ≧ 2388 207 231
N30EH 1080 1150 ≧ 756 ≧ 2388 223 255
N33EH 1130 1190 ≧ 816 ≧ 2388 247 272
N35EH 1170 1230 ≧ 836 ≧ 2388 263 295
N38EH 1200 1270 ≧ 886 ≧ 2388 279 310
N40EH 1250 1300 ≧ 912 ≧ 2388 302 328
N42EH 1280 1340 ≧ 938 ≧ 2308 310 350
N45EH 1330 1370 ≧ 976 ≧ 2388 342 366
N48EH 1360 1410 ≧ 976 ≧ 2388 358 390
N50EH 1370 1430 ≧ 1026 ≧ 2307 366 406
N52EH ≧ 1410   ≧ 1042 ≧ 2307 382 414
N28TH 1020 1100 ≧ 780 ≧ 2706 199 239
N30TH 1070 1140 ≧ 756 ≧ 2706 215 255
N33TH 1110 1190 ≧ 812 ≧ 2706 239 271
N35TH 1170 1230 ≧ 845 ≧ 2706 263 295
N38TH 1200 1270 ≧ 886 ≧ 2627 279 314
N40TH 1250 1290 ≧ 912 ≧ 2627 302 326
N42TH 1280 1330 ≧ 838 ≧ 2627 310 342
N45TH 1320 1370 ≧ 976 ≧ 2627 342 366

*The listed grades are for reference only. Please inquire about available grades.

List of magnetic properties by grade of samarium-cobalt magnets

The approximate residual magnetic flux density (Br), coercivity (Hcb), intrinsic coercivity (Hcj), and maximum energy product ((BH)max) for each grade are shown in the table below.

grade Br Hcb Hcj (BH)max
Min Max Min Max Min Max Min Max
18 (Series 1-5) 840 910 620 700 1194 1831 127 159
20 (Series 1-5) 870 940 653 732 1194 1831 150 175
22 (Series 1-5) 910 980 680 756 1194 1831 159 185
24 (Series 1-5) 950 1020 717 796 1194 1831 175 200
22 930 970 676 740 ≧ 1433   160 183
24 950 1030 692 764 ≧ 1433   175 191
26 1010 1060 733 796 ≧ 1273   190 215
28 1020 1090 748 812 ≧ 1273   205 231
30 1070 1110 748 835 ≧ 1273   220 247
32 1100 1150 812 860 ≧ 1433   230 255
24H 950 1030 692 764 ≧ 1990   175 199
26H 1010 1060 733 796 ≧ 1990   191 215
28H 1030 1090 749 812 ≧ 1990   207 231
30H 1080 1110 773 835 ≧ 1990   220 247
32H 1100 1150 812 860 ≧ 1990   230 255
24M 960 1030 597 756 796 1273 175 199
26M 1010 1060 597 820 796 1433 161 215
28M 1030 1090 621 836 796 1433 207 231
30M 1060 1110 621 836 796 1433 220 247
32M 1100 1150 676 852 796 1433 230 255
24L 950 1030 438 716 478 955 175 199
26L 1010 1060 438 784 478 955 191 215
28L 1030 1090 438 764 478 955 207 231
30L 1080 1150 438 796 478 955 220 247
32L 1100 1150 541 812 636 955 230 255
LT10 (Low Temperature Coefficient) 620 660 485 517 ≧ 1830   75 88
LT14 (Low Temperature Coefficient) 730 800 565 0 ≧ 1592   103 127
LT16 (Low Temperature Coefficient) 790 860 605 669 ≧ 1592   111 143
LT18 (Low Temperature Coefficient) 830 890 629 708 ≧ 1433   127 159
LT20 (Low Temperature Coefficient) 870 940 653 732 ≧ 1433   143 175
LT22 (Low Temperature Coefficient) 940 980 668 740 1194 1591 67 183
HT20 (high temperature resistance) 870 940 653 732 ≧ 1592   143 175
HT22 (high temperature resistance) 910 990 693 748 ≧ 1830   159 183
HT24 (high temperature resistance) 960 1040 724 788 ≧ 1830   175 199

*Please inquire about the availability of samarium-cobalt magnets on a case-by-case basis.