Magnetic Properties
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| Neodymium Samarium Cobalt Ferrite Alnico Flexible |
The tables below summarize key magnetic and physical characteristics of our magnet materials.
| Neodymium Iron Boron | Magnetic Properties | Physical Properties |
| Samarium Cobalt | Magnetic Properties | Physical Properties |
| Ferrite | Magnetic Properties | Physical Properties |
| Alnico | Magnetic Properties | Physical Properties |
Browse through or dowload the Rare Earth Magnets Data Book (3.6Mb 
) with BH Curves for our Rare Earth materials. Or, click on the grade in the tables below to see specific BH curve data for that grade.
Neodymium Iron Boron - material overview
| Neodymium Iron Boron - Magnetic Properties | |||||||||
| Grade | Press1 | Br (kGauss) | Hc (kOersteds) | Hci (kOersteds) | BHmax (MGOe) | Temperature Coefficients (%/°C) | Maximum Operating Temp @ Pc = 2 (2) | ||
| Range | Typical | Minimum | Range | of Br | of Hci | (°C) | (°F) | ||
| N5311 | D | 14,2 ~ 14,7 | 10,3 | 11,0 | 48 ~ 53 | -0.11 | -0.65 | ~ 80 | ~ 170 |
| N5014 | I | 13,9 ~ 14,4 | 13,1 | 14,0 | 46 ~ 51 | -0.11 | -0.61 | ~ 130 | ~ 260 |
| N5011 | D | 13,9 ~ 14,4 | 10,3 | 11,0 | 46 ~ 51 | -0.11 | -0.61 | ~ 110 | ~ 230 |
| N4916 | D | 13,5 ~ 14,1 | 12,7 | 16,0 | 44 ~ 49 | -0.11 | -0.61 | ~ 140 | ~ 280 |
| N4914 | D | 13,6 ~ 14,1 | 12,8 | 14,0 | 45 ~ 49 | -0.11 | -0.61 | ~ 130 | ~ 260 |
| N4616 | D | 13,2 ~ 13,7 | 12,5 | 16,0 | 41 ~ 46 | -0.11 | -0.61 | ~ 140 | ~ 280 |
| N4614 | D | 13,3 ~ 13,8 | 12,2 | 14,0 | 42 ~ 46 | -0.11 | -0.61 | ~ 130 | ~ 260 |
| N4518 | D | 13,2 ~ 13,7 | 12,5 | 18,0 | 41 ~ 45 | -0.11 | -0.55 | ~ 150 | ~ 300 |
| N4321 | D | 12,7 ~ 13,2 | 12,0 | 21,0 | 39 ~ 43 | -0.10 | -0.54 | ~ 160 | ~ 320 |
| N4316 | D | 12,8 ~ 13,3 | 12,0 | 16,0 | 39 ~ 43 | -0.10 | -0.59 | ~ 150 | ~ 300 |
| N4025 | D | 12,2 ~ 12,8 | 11,5 | 25,0 | 36 ~ 40 | -0.10 | -0.50 | ~ 200 | ~ 390 |
| N4021 | D | 12,3 ~ 12,9 | 11,6 | 21,0 | 36 ~ 40 | -0.10 | -0.55 | ~ 160 | ~ 320 |
| N3917 | D | 12,3 ~ 12,7 | 11,7 | 17,0 | 36 ~ 39 | -0.10 | -0.59 | ~ 150 | ~ 300 |
| N3730 | D | 11,6 ~ 12,2 | 11,0 | 30,0 | 33 ~ 37 | -0.10 | -0.45 | ~ 230 | ~ 440 |
| N3725 | D | 11,4 ~ 12,0 | 11,2 | 25,0 | 32 ~ 37 | -0.08 | -0.51 | ~ 230 | ~ 440 |
| N3621 | D | 11,9 ~ 12,5 | 11,7 | 21,0 | 34 ~ 39 | -0.09 | -0.53 | ~ 160 | ~ 320 |
| N3530 | D | 11,3 ~ 11,9 | 10,7 | 30,0 | 31 ~ 35 | -0.10 | -0.46 | ~ 230 | ~ 440 |
| N3428 | I | 11,2 ~ 11,8 | 11,1 | 28,0 | 30 ~ 34 | -0.08 | -0.51 | ~ 240 | ~ 460 |
| N3412 | D | 11,7 ~ 11,9 | 10,9 | 12,0 | 33 ~ 34 | -0.11 | -0.61 | ~ 110 | ~ 230 |
| N3335 | D | 11,0 ~ 11,6 | 10,4 | 35,0 | 29 ~ 33 | -0.10 | -0.42 | ~ 250 | ~ 480 |
| N3330 | D | 11,1 ~ 11,7 | 10,5 | 30,0 | 29 ~ 33 | -0.08 | -0.44 | ~ 230 | ~ 440 |
1 D: Die-Pressed, I: Isostatically-Pressed
2 The Maximum Operating Temperature shown here is for magnets operating at a Permeance Coefficient of 2. At the temperatures shown the material's BH Curve does not develop a knee and is still fairly linear.
| Neodymium Iron Boron - Typical Physical Properties | |||||||||||
| Density | Bending Strength | Compressive Strength | Electrical Resistivity (Ωm) |
Coeff. Of Thermal Expansion3 | Curie Temperature | ||||||
| (kg/m3) | (lbs/in3) | (kg/m2) | (lbs/in2) | (kg/m2) | (lbs/in2) | // M | M | (°C) | (°F) | ||
| 7.6 x 103 | 0.275 | 2.95 x 103 | 4.2 x 104 | 9.6 x 103 | 1.3 x 105 | 1.4 x 10-6 | 7.9 x 10-6 | -1.7 x 10-6 | 345 | 655 | |
3 // M Parallel to magnetic orientation, ”´M Perpendicular to magnetic orientation
Samarium Cobalt - material overview
| Samarium Cobalt - Magnetic Properties | ||||||||||
| Grade | Press1 | Type2 | Br (kGauss) | Hc (kOersteds) | Hci (kOersteds) | BHmax (MGOe) | Temperature Coefficients (%/°C) | Maximum Operating Temp @ Pc = 2 (2) | ||
| Range | Typical | Minimum | Range | of Br | of Hci | (°C) | (°F) | |||
| S3410 | D | 2:17 | 11,3 ~ 12,1 | 10,0 | 10,0 | 29 ~ 34 | -0.03 | -0.22 | ~ 300 | ~ 570 |
| S3320 | D | 2:17 | 11,2 ~ 12,0 | 10,6 | 20,0 | 28 ~ 33 | -0.04 | -0.27 | ~ 325 | ~ 610 |
| S3310 | D | 2:17 | 11,2 ~ 12,0 | 9,0 | 10,0 | 28 ~ 33 | -0.04 | -0.25 | ~ 300 | ~ 570 |
| S3120 | D | 2:17 | 10,7 ~ 11,5 | 10,3 | 20,0 | 25 ~ 31 | -0.04 | -0.20 | ~ 350 | ~ 660 |
| S3018 | D | 2:17 | 10,2 ~ 11,2 | 9,8 | 18,0 | 24 ~ 30 | -0.04 | -0.20 | ~ 400 | ~ 750 |
| S3007 | D | 2:17 | 10,5 ~ 11,2 | 8,25 | 7,00 | 24 ~ 30 | -0.04 | -0.17 | ~ 250 | ~ 480 |
| S2909 | D | 2:17 | 10,2 ~ 11,0 | 9,25 | 9,00 | 25 ~ 29 | -0.03 | -0.17 | ~ 300 | ~ 570 |
| S2809 | D | 2:17 | 10,0 ~ 10,8 | 9,25 | 9,00 | 24 ~ 28 | -0.03 | -0.19 | ~ 300 | ~ 570 |
1 D: Die-Pressed, I: Isostatically-Pressed
2 Type: Sm1Co5 or Sm2Co17 types
3 The Maximum Operating Temperature shown here is for magnets operating at a Permeance Coefficient of 2. At the temperatures shown the material's BH Curve does not develop a knee and is still fairly linear.
| Samarium Cobalt - Typical Physical Properties | |||||||||||
| Density | Bending Strength | Compressive Strength | Electrical Resistivity (Ωm) |
Coeff. Of Thermal Expansion4 | Curie Temperature | ||||||
| (kg/m3) | (lbs/in3) | (kg/m2) | (lbs/in2) | (kg/m2) | (lbs/in2) | // M | ”´M | (°C) | (°F) | ||
| 8.4 x 103 | 0.304 | 1.2 x 103 | 1.7 x 104 | 9.1 x 103 | 1.3 x 105 | 0.8 x 10-6 | 9.2 x 10-6 | 11.8 x 10-6 | 825 | 1510 | |
3 // M Parallel to magnetic orientation, ”´M Perpendicular to magnetic orientation
| Ferrite (Ceramic) - Magnetic Properties | |||||||
| Grade | Type | Br (kGauss) | Hc (kOersteds) | Hci (kOersteds) | BHmax (MGOe) | Temperature Coefficients (%/°C) | |
| of Br | of Hci | ||||||
| F1132 | Fully Dense | 2,20 | 1,90 | 3,25 | 1.1 | -0.18 | 0.20 |
| F3624 | Fully Dense | 3,95 | 2,40 | 2,45 | 3.6 | -0.18 | 0.20 |
| F3532 | Fully Dense | 3,90 | 3,20 | 3,25 | 3.5 | -0.18 | 0.20 |
| F4450 | Fully Dense | 4,30 | 4,15 | 5,00 | 4.4 | -0.18 | 0.20 |
| Flex 0.6 | Flexible | 1,725 | 1,325 | 1,340 | 0.6 | -0.18 | 0.20 |
| Flex 1.1 | Flexible | 2,20 | 2,00 | 2,40 | 1.1 | -0.18 | 0.20 |
| Flex 1.4 | Flexible | 2,45 | 2,20 | 2,40 | 1.4 | -0.18 | 0.20 |
| Flex 1.6 | Flexible | 2,65 | 2,20 | 2,40 | 1.6 | -0.18 | 0.20 |
Note: Magnetic properties of fully dense ferrite materials degrade linearly with temperature. At 350° F, about 75% of room temperature magnetization is retained, and at 550° F, about 50% is retained. The maximum operating temperature for flexible ferrite materials is governed by the carrier; this is normally a vinyl compound and does not allow the material to operate above about 240° F.
| Ferrite (Ceramic) - Physical Properties | |||||||||||
| Type | Density | Bending Strength | Compressive Strength | Electrical Resistivity (Ωm) |
Coeff. Of Thermal Expansion1 | Curie Temperature | |||||
| (kg/m3) | (lbs/in3) | (kg/m2) | (lbs/in2) | (kg/m2) | (lbs/in2) | // M | ”´M | (°C) | (°F) | ||
| Fully Dense | 4.9 x 103 | 0.180 | 1.4 x 103 | 2.0 x 104 | 9.1 x 103 | 1.3 x 105 | 1 x 108 | 1.4 x 10-5 | 1 x 10-5 | 450 | 840 |
| Flexible | 3.8 x 103 | 0.140 | 450 | 840 | |||||||
1 // M Parallel to magnetic orientation, ”´M Perpendicular to magnetic orientation.
| Alnico - Magnetic Properties | ||||||||
| Grade | Type | Br (kGauss) | Hc (kOersteds) | Hci (kOersteds) | BHmax (MGOe) | Temperature Coefficient Br (%/°C) | Maximum Operating Temp | |
| (°C) | (°F) | |||||||
| 5 C | Cast | 12,500 | 640 | 640 | 5.5 | -0.013 | 540 | ~ 1000 |
| 5 S | Sintered | 10,800 | 600 | 600 | 3.8 | -0.007 | 540 | ~ 1000 |
| 8 C | Cast | 8,300 | 1,650 | 1,650 | 5.5 | -0.013 | 540 | ~ 1000 |
| 8 S | Sintered | 7,000 | 1,900 | 1,900 | 5.0 | -0.013 | 540 | ~ 1000 |
| Alnico - Physical Properties | |||||||||||
| Grade | Type* | Density (kg/m3) | Bending Strength | Compressive Strength | Electrical Resistivity (Ωm) | Coeff. Of Thermal Exp. | Curie Temperature | ||||
| (kg/m3) | (lbs/in3) | (kg/m2) | (lbs/in2) | (kg/m2) | (lbs/in2) | (°C) | (°F) | ||||
| ALL | Cast | 7.3 x 103 | 0.265 | 4.7 x 10-3 | 11.4 x 10-6 | 860 | 1580 | ||||
| ALL | Sintered | 7.0 x 103 | 0.255 | 4.7 x 10-3 | 11.4 x 10-6 | 860 | 1580 | ||||
