Novel torque magnetometry for uniaxial anisotropy constants of thin films and its application to FePt granular thin films
Novel torque magnetometry for uniaxial anisotropy constants of thin films and its application to FePt granular thin films
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DOI：
10.7567/apex.11.033002
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发表时间：
2018-02
影响因子：
2.3
通讯作者：
T. Ono;N. Kikuchi;S. Okamoto;O. Kitakami;T. Shimatsu
中科院分区：
文献类型：
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作者：
T. Ono;N. Kikuchi;S. Okamoto;O. Kitakami;T. Shimatsu
提出了一种基于转矩磁强计的技术，用于精确确定垂直磁化薄膜的单轴磁各向异性常数，Ku，特别是Ku大于106 J/m3，通过电检测的异常霍尔效应和磁场方向的精确确定。该技术可以测量几个纳米厚的多晶薄膜的Ku值。此外，评价了预期可用于高密度磁记录介质的FePt-C颗粒膜的Ku值。在450 °C下制备的4 nm厚FePt-C薄膜的本征Ku值在碳含量高达34 vol % C时约为3 MJ/m3。
A technique based on torque magnetometry is proposed for precise determination of the uniaxial magnetic anisotropy constant, Ku, of perpendicularly magnetized thin films, in particular for Ku larger than 106 J/m3, by electrical detection of the anomalous Hall effect and exact determination of the magnetic field direction. This technique can measure the Ku value of several-nanometer-thick polycrystalline films. Further, the Ku value of FePt–C granular films, which are expected to be useful for high-density magnetic recording media, is evaluated. The intrinsic Ku value of 4-nm-thick FePt–C thin films fabricated at 450 °C is approximately 3 MJ/m3 for carbon contents up to 34 vol % C.