SmCo Magnet(Samarium-cobalt magnet) is a type of strong permanent magnet made of an alloy of samarium and cobalt. They are generally ranked similarly in strength to neodymium magnet, but have higher temperature ratings and higher coercivity.

  • Higher coercivity than Neodymium Magnet- Extremely resistant to demagnetization
  • Good temperature stability (maximum use temperatures between 250 °C (523 K) and 550 °C (823 K); Curie temperatures from 700 °C (973 K) to 800 °C (1,070 K)
  • Very brittle, easy to chip in all magnetic materials. Eays to have inherent cracks that do not have mechanical integrity.
  • Much expensive than other magnetic materials.
  • SmCO magnets have two series: SmCo5,Sm2Co17

Applications

Holding systems requiring very high holding forces, high field yoke magnets, high performance stepper, DC motors, servo motors, linear motors, voice coil motors, magnetic bearings, magnetic couplings, loudspeakers, Halbach arrays, headphones, microphones, magnetic separation, instrumentation, switches, relays, magnetic resonance, sputtering, vacuum deposition, charged particle beam guidance, particle accelerators, Undulators, Wigglers, Traveling wave tubes, Computer rigid disc drives, Sensors, Various automotive applications

Typical Magnetic Properties

TYPICAL MAGNETIC PROPETIES OF SINTERED SMCO MAGNET
GradeBrHcbHcj(BH)maxDensityTW MaxSeries
The effective Maximum Operating Temperature for a Samarium Cobalt Magnet is a function of the magnet’s magnetic characteristics and the geometry of the system (the magnet and the circuit). The listing maximum operating temperature is a recommendation and infers and ideal geometry and no external demagnetizing fields. Please engage Jack to review the application before selecting a particular grade.
 kGs(mT)kOe(kA/m)kOe(kA/m)MGOe(kJ/M3)g/cm3 
SmCo168.3(830)8.0(640)18.0(1430)16.0(128)8.3250

1:5

SmCo188.8(880)8.5(680)18.0(1430)18.0(144)8.3250
SmCo209.2(920)8.7(700)18.0(1430)20.0(160)8.3250
SmCo229.4(940)9.1(730)18.5(1450)22.0(176)8.3250
SmCo249.8(980)9.4(750)18.5(1450)24.0(192)8.3250
SmCo249.8(980)9.1(730)18.5(1450)24.0(192)8.4300

2:17

SmCo2610.3(1030)9.5(760)18.5(1450)26.0(208)8.4300
SmCo2810.5(1050)9.7(780)18.5(1450)28.0(224)8.4300
SmCo3011.0(1100)10.1(810)18.5(1450)30.0(240)8.4300
SmCo26M10.3(1030)9.5(760)15.0(1100)26.0(208)8.4300
SmCo28M10.5(1050)9.7(780)15.0(1100)28.0(224)8.4300
SmCo30M11.0(1100)10.1(810)15.0(1100)30.0(240)8.4300
SmCo28L10.5(1050)6.9(550)8.0(700)28.0(224)8.4250
SmCo30L11.0(1100)6.9(550)8.0(700)30.0(240)8.4250
SmCo24H10.0(1000)9.0(720)25.0(2000)24.0(192)8.4350
SmCo26H10.3(1030)9.5(760)25.0(2000)26.0(208)8.4350
SmCo28H10.5(1050)9.6(770)25.0(2000)28.0(224)8.4350
SmCo30H10.8(1080)10.1(810)25.0(2000)30.0(240)8.4350
Samarium Cobalt Magnets – Physical Properties
PropertyUnitValues SmCo (1-5)Values SmCo (2-17)
The listed values are approximate and should be used as a reference.  Any magnetic or physical characteristics should be substantiated before selecting a magnet material. 
Vickers HardnessHv450 – 550500 – 600
Densityg/cm38.38.4
Curie Temp Tc°C700 – 750800 – 850
Curie Temp Tf°F1,292 – 1,3821,472 – 1,562
Specific ResistanceμΩ·Cm5386
Bending StrengthMpa1.8 x 1081.5 x 108
Compressive StrengthMpa10 x 1088 x 108
Thermal Expansion Parallel (∥)
to Orientation (M)
°C-16 x 10-68 x 10-6
Thermal Expansion
Perpendicular (⊥) to Orientation (M)
°C-113 x 10-611 x 10-6
Young’s Moduluskg/mm21.6 x 1041.2 x 104
Reversible Temperature Coefficient for Br (α)
Temperature Range 
(°C)
Induction Br (α) SmCo 1-5
(%)/°C
Induction Br (α) SmCo 2-17
(%)/°C
α = Δ Br / Δ T * 100 (Br @ 20°C) [ΔT = Relevant ranges listed above.]
-100°C to 20°C-0.045-0.030
20°C to 100°C-0.045-0.030
100°C to 200°C-0.050-0.035
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