British Journal of Applied Physics · 1955 · 11 citations · 1 references
Natural SciencesMaterials EngineeringMaterials ScienceMagnetic MaterialsMetallic MaterialsMetallurgyFerromagnetic MaterialsFerromagnetismMagnetic AnisotropyMagnetic CharacterizationMagnetization ProcessesPermanent MagnetsAlnico MagnetsAlternating Magnetic FieldAlternating-field DemagnetizationCoercivityMagnetic CoercivityMagnetic LossesMagnetization Versus TemperatureTemperature-dependent Magnetization
Magnetometer measurements have been made of the change in magnetization with temperature between +60 and -60° C for magnets with a range of dimension ratios. The materials tested were Alcomax III, Columax, Alnico, 35 and 15% cobalt steels. With decreasing temperatures the magnetization increases reversibly except for the shorter dimension ratio magnets in Alcomax III and Columax, for which losses occur. The influence of tempering on these losses is discussed. Losses occur in the lower coercivity materials only with increasing temperature. The losses, whether due to increase or decrease of temperature, can be minimized by a partial demagnetization by an alternating field. The results are correlated with the changes in the demagnetization curves of the materials with temperature.
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