ナノ構造磁性酸化物層を含むスピンバルブ薄膜の磁気結合

概要

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The exchange bias field and its training effect, the MR ratio as a function of the measured angles, and the interlayer coupling of Fe_<0.7>Co_<0.3>/Cr-nano-oxide-layer (NOL) spin-valves (SVs) were studied to investigate the magnetism and the structure of Fe_<0.7>Co_<0.3>/Cr-NOL. Strong negative interlayer coupling was observed, which suggests Fe_<0.7>Co_<0.3>/Cr-NOLs have very flat surfaces. However, the unusual tendency of the dependence on temperature of the exchange bias field and its training effect were observed due to the twisted coupling through on Fe_<0.7>Co_<0.3>/Cr-NOL. As a result, this suggested that Fe_<0.7>Co_<0.3>/Cr-NOLs include several different magnetic components, such as ferrimagnetic components of Co^<2+>Fe^<3+>_<2-t>Cr^<3+>_tO_4 and Fe^<2+>Fe^<3+><2-t>Cr^<3+>_tO_4 and antiferromagnetic components of Cr_2O_3・Fe_2O_3 and CoO.
2008-09-01