45° sign switching of effective exchange bias due to competing anisotropies in fully epitaxial Co3FeN/MnN bilayers
45° sign switching of effective exchange bias due to competing anisotropies in fully epitaxial Co3FeN/MnN bilayers
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DOI：
10.1088/1361-648x/aa9ba7
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发表时间：
2018-01
期刊：
影响因子：
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通讯作者：
T. Hajiri;Takuya Yoshida;M. Filianina;S. Jaiswal;B. Borie;H. Asano;Hartmut Zabel;Mathias Klaui
中科院分区：
文献类型：
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作者：
T. Hajiri;Takuya Yoshida;M. Filianina;S. Jaiswal;B. Borie;H. Asano;Hartmut Zabel;Mathias Klaui
我们报告了一个不寻常的角度依赖于铁磁/反铁磁双层膜，其中铁磁和反铁磁外延生长的交换偏置效应。数值模型计算预测交换偏置场的符号切换的大约45°周期，取决于磁晶各向异性和交换耦合常数之间的比率。符号的切换表示铁磁体的四重磁晶各向异性与交换耦合的单向各向异性场之间的竞争。这种预测不寻常的角度依赖性的交换偏置和磁化切换过程中证实了完全外延Co 3FeN/MnN双层膜的纵向和横向磁光克尔效应磁强计的测量。这些结果提供了一个更深入的了解交换耦合现象，在完全外延双层定制的材料，并开辟了一个复杂的开关能量景观工程的各向异性。
We report an unusual angular-dependent exchange bias effect in ferromagnet/antiferromagnet bilayers, where both ferromagnet and antiferromagnet are epitaxially grown. Numerical model calculations predict an approximately 45° period for the sign switching of the exchange-bias field, depending on the ratio between magnetocrystalline anisotropy and exchange-coupling constant. The switching of the sign is indicative of a competition between a fourfold magnetocrystalline anisotropy of the ferromagnet and a unidirectional anisotropy field of the exchange coupling. This predicted unusual angular-dependent exchange bias and its magnetization switching process are confirmed by measurements on fully epitaxial Co3FeN/MnN bilayers by longitudinal and transverse magneto-optic Kerr effect magnetometry. These results provide a deeper understanding of the exchange coupling phenomena in fully epitaxial bilayers with tailored materials and open up a complex switching energy landscape engineering by anisotropies.