強磁性/反強磁性積層膜の交換磁気異方性 : 反強磁性層の磁気異方性とその役割

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The origin of magnetic anisotropy of the antiferromagnetic layer and its role in the magnetization process of exchange-coupled ferromagnetic(F)/antiferromagnetic(AF) bilayers are discussed. Magnetic torque analysis of pseudo-single crystalline F/AF bilayers strongly suggests that the magnetocrystalline anisotropy of the antiferromagnet is the origin of magnetic anisotropy of the AF layer. According to the simple exchange anisotropy model established by Meiklejohn and Bean (1957), magnetic torque curves were analyzed for pseudo-single crystalline Ni-Fe/Mn-Ni and Mn-Ir/Ni-Fe bilayers, the AF layer thicknesses of which are less than the critical value necessary to induce an exchange bias field. The anisotropy energies of Mn_<82>Ni_<18> and Mn_<75>Ir_<25> were determined in (110)-(001)-, (111)-planes from the saturation torque amplitude of the pseudo-single crystalline bilayers with the respective crystallographic orientation. We introduce a single spin ensemble model for polycrystalline bilayers, taking into account the two-dimensional random distribution of the magnetic anisotropy axes of AF grains. We also successfully elucidate the exchange anisotropy features, such as blocking temperature, reversible directional control by field cooling, critical AF layer thickness, and changes of unidirectional anisotropy constant by thermal annealing, with a single spin ensemble model, in relation to the role of the magnetic anisotropy of the AF layer.
社団法人日本磁気学会の論文
2004-02-01

強磁性/反強磁性積層膜の交換磁気異方性 : 反強磁性層の磁気異方性とその役割

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