DWMR素子のR-H曲線へのセンス電流の影響とマイクロ波の発振

概要

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We investigated the influence of a direct current on domain wall magnetoresistance (DWMR) elements with Fe_<0.5>Co_<0.5>-AlO_x nano-oxide-layer including ferromagnetic metal nanocontacts. The current induced microwave oscillation and changes in the shape of R-H curves with increase of sense current were observed. The origin of these results are considered to be spin transfer effect on the confined domain wall in ferromagnetic metal nanocontacts and current induced magnetic field adjacent to ferromagnetic metal nanocontacts because of high current density. Furthermore, our study indicates a high likelihood of correlation between microwave oscillation and R-H curves in high sense current. We infer current induce microwave oscillation in the higher resistance state which was observed after the jump of resistance by high sense current. Moreover, it is suggested that there is some correlation between oscillation frequency and degree of twist of magnetization in a domain wall.
社団法人日本磁気学会の論文
2008-09-01