Proposal of a Suitable Antiferromagnetic Film for Pinning Fe_3O_4 Film : CrMnPt

概要

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Exchange coupling between half-metallic Fe_3O_4 and antiferromagnetic PtMn, MnIr, and CrMnPt films was investigated, with the goal of inducing unidirectional anisotropy in the Fe_3O_4 film, which has hard magnetic properties. The Fe_3O_4-CrMnPt system exhibited superior exchange coupling properties : a large unidirectional anisotropy constant (K_e) of 〜0.15-0.18 erg/cm^2, a high blocking temperature (T_B) of 〜320℃, and a nearly unidirectionally shifted M-H curve. In the Fe_3O_4-PtMn system, the K_e value degraded to around zero. The oxygen in the Fe_3O_4 film diffused into the adjacent films through thermal annealing to produce PtMn-phase transition, resulting in considerable K_e degradation. In the Fe_3O_4- MnIr system, the K_e and T_B values were a little too low for practical application. From these results, it is reasonable to suppose that the most suitable antiferromagnetic material for pinning Fe_3O_4 film in spintronics devices is CrMnPt.
社団法人日本磁気学会の論文
2004-08-01