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Magnetic Materials

Ferromagnetic materials are divided into two categories:

  • Soft Magnetic Materials
    • Easy to magnetise and demagnetise
    • Commonly used for making temporary magnets
  • Hard Magnetic Materials
    • Materials that retain their magnetism even after the removal of the applied magnetic field and are difficult to demagnetise
    • Used for making permanent magnets
    • Made from Rare Earth Metals, Aluminium Nickel Cobalt (AlNiCo) Alloys and Ferrites

Typical Ferromagnetic Materials include:

  • Neodymium Iron Boron (NdFeB) Magnets
    • Strongest Permanent Magnet
    • High Energy Product
    • High Coercive Force
  • Aluminium Cobalt Nickel (AlNiCo) Magnets
    • Good Temperature Stability
    • Good Resistance to Demagnetisation
    • High Residual Induction
    • High Energy
  • Samarium Cobalt (SmCo) Magnets
    • High Magnetic Properties
    • Excellent Thermal Stability
    • High Resistance to Corrosion and Oxidation
  • Ferrite Magnets (Iron Oxide + Strontium Carbonate)
    • Also Known as Ceramic Magnets
    • Most Commonly used Permanent Magnets
    • Excellent Corrosion and Demagnetisation Resistance Properties

As such, the properties of these magnets allow them to be used in the Electronic, Medical and Automotive Industries.

Magnetic Materials shapes consist of Disc, Ring, Rectangle, Bar, Cylinder, Plate & Custom-shaped.

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Neodymium Iron Boron (NdFeB) Magnets
Sintered Neodymium Iron Boron NdFeB Magnets
Plated Ni-Cu-Ni Grades
Grade
Residual Induction Br mT
Energy Product BH Max MGsOe
30 – 401080 – 1280223 – 326
42 – 521280 – 1480318 – 422
30M – 40M1080 – 1280223 – 326
42M – 50M1280 – 1450318 – 406
30H – 38H1080 – 1250223 – 310
40H – 48H1250 – 1430302 – 390
30S – 38S1080 – 1250223 – 310
40S – 45S1240 – 1380318 – 366
28U – 33U1020 – 1170207 – 271
35U – 40U1180 – 1280263 – 326
28E – 38E1040 – 1250207 – 310
28A – 33A1110 – 1170199 – 271
Sintered Neodymium Iron Boron NdFeB Magnet Properties
Physical Properties
Unit
Results
Curie Temperature°C310 – 380
MAX Operating Temperature°C80 – 230
HardnessHv620
Electrical ResistivityΩ.cm1.8 x 10-4 – 2.0 x 10-4
Densityg/cm37.45 – 7.65
Recoil Permeability–≥ 30
Magnetization Field StrengthKoe / KA / m≥ 2400
Bending StrengthMPa295 – 345
Temp. Coefficient of Br% / °C-0.1 – -0.2
Temp. Coefficient of Hcj% / °C-0.5 – -0.7
Aluminium Nickel Cobalt (AlNiCo) Magnets
Aluminium Nickel Cobalt AlNico Magnet Grades
Grades

Residual Induction Br
mT
Density
g/cm3
Remark

ANC 17206.9Isotropic
ANC 27507.1
ANC 37006.9
ANC 512807.3Anisotropic
ANC 5D13307.3
ANC 5E13507.3
ANC 610507.3
ANC 88207.3
ANC 8H7207.3
ANC 910607.3
Sintered Aluminum Nickel Cobalt AlNico Magnet Grades
Grades

Residual Induction Br
mT
Density
g/cm3
Remark

ANC 2S7106.9Isotropic
ANC 5S10907.3Anisotropic
ANC 6S9407.3
ANC 8S9407.3
ANC 8SH6707.3
Samarium Cobalt (SmCo) Magnets
Injection Moulded Samarium Cobalt SmCo Magnet Grades 
Material
Grade

Energy Product BH max
MGsOe
Residual Induction Br min – max
kGs
Density
g/cm3
Temperature Coefficient
%/°C

Curie Temperature
°C
Max Woking Temperature
°C
SC516H15 – 187.7 – 8.68.3-0.04≥ 740250
18H17 – 208.1 – 9.2
20H 19 – 22 8.5 – 9.5
22H 21 – 24 8.9 – 10
S2C1724HM22 – 259.2 – 10.48.4-0.03≥ 850350
26HM24 – 2710 – 10.6
28HM26 – 2910.4 – 11
30HM28 – 3110.7 – 11.2
32M29 – 3210.9 – 11.5
Low CTE S2C1722L20 – 239.0 – 9.98.4-0.015≥ 850350
24L22 – 259.2 – 10.2
Ferrite Magnets (Iron Oxide + Strontium Carbonate)
Sintered Ferrite Magnet Grades
Grade

Residual Induction Br
kGs
Energy Product BH max
MGsOe
10T2.0 – 2.350.80 – 1.20
20 – 282.2 – 4.01.06 – 3.50
22H – 27H3.1 – 4.02.50 – 3.70
32 –383.8 – 4.53.52 – 4.80
30H – 33H3.8 – 4.33.45 – 4.52
40 – 493.8 – 4.33.30 – 4.20