FeRh系合金の磁区構造と磁気光学特性 (<特集>磁気光学・光磁気記録)

概要

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Magneto-optical polar Kerr effects between 1.5 and 6 eV and the domain structures of body-centered cubic (bcc) FeRh alloy, bcc FeRh_<0.82>Pd_<0.18> alloy, and body-centered tetragonal (bct) FeRh_<0.24>Pt_<0.76> alloy were investigated for the first time. A temperature-induced AF-FM phase transition was attained at a temperature width of 2 K for FeRh and FeRh_<0.82>Pd_<0.18> alloys at a temperature width of 40 K for FeRh_<0.24>Pt_<0.76>. A large width of the transition for FeRh_<0.24>Pt_<0.76> was also observed in the temperature dependence of domain structures investigated by magnetic force microscopy, and may be attributed to the internal stress caused by the anisotropic change in the lattide constants during the transition. The Kerr rotation spectrum of FeRh showed two negative peaks near 2.8 eV and 3.8 eV, which may be due to the contribution of Rh. In the spectrum of Pd-doped FeRh_<0.82>Pd_<0.18>, a new peak appeared around 4.8 eV and enhanced the rotation. The spectrum of FeRh_<0.24>Pt_<0.76> alloy resembles that of FePt alloy, and no contribution of Rh is observed.
社団法人日本磁気学会の論文
1997-04-15