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The effect of interface roughness on the perpendicular exchange bias of NiO/CoPt/Pt stacking structure

Science China(Technological Sciences) 2021年第3期64卷 605-610页

作者： GAO Ying harumoto takashi NAKAMURA Yoshio SHI Ji Department of Materials Science and Engineering Tokyo Institute of Technology2-12-1OokayamaMeguro-kuTokyo 152-8550Japan

An orthogonal coupling structure of NiO/CoPt/Pt/glass with perpendicular exchange bias effect has been *** exchange bias is found to be strongly dependent on the interface roughness between NiO and CoPt *** conventional inverse proportionality of the exchange bias field with the ferromagnetic thickness is not applicable to this top-pinned stacking ***,an anomalous ferromagnetic thickness dependence of blocking temperature is also observed.A simulation on the basis of a spin configuration model with defects at the interface agrees well with the experimental *** findings suggest considerable contribution of the interface roughness to the perpendicular exchange bias.

关键词： perpendicular exchange bias interface roughness FM thickness blocking temperature

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Large lattice mismatch induced perpendicular magnetic anisotropy and perpendicular exchange bias in CoPt/FeMn bilayer films

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Science China(Technological Sciences) 2019年第11期62卷 2009-2013页

作者： PAN ChunJiao GAO TengHua ITOGAWA Nobuhide harumoto takashi ZHANG ZhengJun NAKAMURA Yoshio SHI Ji School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China School of Materials and Chemical Technology Tokyo Institute of TechnologyTokyo 152-8552Japan Department of Applied Physics and Physico-Informatics Keio UniversityYokohama 223-8522Japan

Perpendicular magnetic anisotropy and perpendicular exchange bias of CoPt/FeMn bilayers fabricated by dc magnetron sputtering were investigated in this *** anisotropy,showing strong dependence on thickness of CoPt layer,changes from perpendicular magnetic anisotropy(PMA) into in-plane magnetic anisotropy when CoPt layer is thicker than 4.5 *** evolution of internal stress with thickness,from tensile to compressive,has been analyzed by sin^2 ψ method using an equal biaxial stress *** perpendicular exchange bias(PEB) has been successfully established due to PMA of CoPt and out-ofplane spin component of 3 Q-spin-structured *** thickness dependence of exchange bias field has been systematically investigated.

关键词： perpendicular magnetic anisotropy perpendicular exchange bias X-ray technique magnetic materials

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Effect of Substrate Temperature on the Structure and Magnetic Properties of CoPt/AlN Multilayer Films

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Journal of Wuhan University of Technology(Materials Science) 2016年第1期31卷 44-47页

作者：安红雨 takashi harumoto Takumi SANNOMIYA Shinji MURAISHI TU Rong ZHANG Lianmeng Yoshio NAKAMURA Ji SHI Department of Metallurgy and Ceramics Science Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8552 Japan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The effect of substrate temperature on the structure and magnetic properties of CoPt/AlN multilayer films has been *** crystallinity of CoPt has been improved with increasing substrate temperature from room temperature to 400 ℃.After post-annealing process,L1_0 CoPt structure transformation has also been ***,since the easy magnetic axis of L1_0 CoPt is in[001]orientation,the promotion of L1_0 CoPt transformation causes the change of easy magnetic axis in（111） textured CoPt layers,which impairs the perpendicular magnetic *** optimum substrate temperature should be room temperature to obtain the strongest perpendicular magnetic anisotropy according to the results of the present work.

关键词： CoPt/AlN post-annealing crystallinity magnetic anisotropy

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