Abstract
Specific features of magnetization process in permalloy soft magnetic layer exchange coupled to an amorphous ferrimagnetic Tb-Co layer with strong in-plane magnetic anisotropy were investigated. Anomalous large variations in coercivity Hc and unidirectional anisotropy field He versus temperature T and annealing temperature Ta dependencies were observed. The changes in Hc and He were shown to be reversible for temperature range 5–300K and irreversible for annealing temperatures 400–650K. A critical role of a nonmagnetic spacer in the Нс(Т) and Нe(Т) formation were demonstrated. In conclusion simple explanation based on an assumption of thermally-induced variation of the interlayer magnetic boundary position and interdiffusion process was proposed.
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