Journal of Applied Physics · 1978 · 24 citations · 2 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsSolid State PhysicsFerromagnetismMagnetic CharacterizationMagnetic Properties Of SolidsMagnetism In SolidsMagnetization ProcessesDomain Wall MotionField MeasurementsField-driven Domain Wall MotionMagnetic Materials CharacterizationMagnetic SaturationSaturation MagnetizationTemperature-dependent MagnetizationThermally Activated Domain Wall Motion
The phenomenon of giant intrinsic magnetic hardness in SmCo5−xNix and SmCo5−yCuy is investigated in applied fields up to 23.5 T. At 4.2 K, the average propagation field (approximate coercive field) Hp is ≃13.0 T, 22.0 T and 18.2 T for x=3, 3.6 and 4.2 respectively, and Hp is ≃12.0 and ≃23.0 T for y=2.5 and 3.6 respectively. At 77 K, values of Hp≃5.0 and ≃5.5 T for y=2.5. Some values of Hp at 4.2 K are the largest observed to date for any material. The results are consistent with models for thermally activated domain wall motion. For several materials the irreversible portion of the magnetization is not saturated at 23 T and 4.2 K. In these cases the maximum magnetization is less than that observed at 77 K.
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