Magnetic Properties

The tables below summarize key magnetic and physical characteristics of our magnet materials.

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 - material overview

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 - material overview

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

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