Effects of antiferromagnetic spin rotation on the anisotropy of ferromagnetic/antiferromagnetic bilayers
Effects of antiferromagnetic spin rotation on the anisotropy of ferromagnetic/antiferromagnetic bilayers
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DOI：
10.1103/physrevb.71.220410
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发表时间：
2004-10
影响因子：
3.7
通讯作者：
S. Urazhdin;C. Chien
中科院分区：
文献类型：
--
作者：
S. Urazhdin;C. Chien
在外延(111)取向的${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}∕{\mathrm{Fe}}_{50}{\mathrm{Mn}}_{50}$双层中，我们分离了两种不同的行为：厚层中的单向各向异性（交换偏差） ${\mathrm{Fe}}_{50}{\mathrm{Mn}}_{50}$ 并增强了薄 ${\mathrm{Fe}}_{50}{\mathrm{Mn}}_{50}$ 的矫顽力。通过测量对旋转磁场的磁化响应，我们定量确定了相关的各向异性，并证明增强的矫顽力与${\mathrm{Fe}}_{50}{\mathrm{Mn}}_{50}$的可旋转未补偿自旋有关。我们证明了各向异性随温度变化的后果，并将我们的结果与其他交换偏置系统联系起来。
In epitaxial (111)-oriented ${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}∕{\mathrm{Fe}}_{50}{\mathrm{Mn}}_{50}$ bilayers, we separate two distinct behaviors: unidirectional anisotropy (exchange bias) in thick ${\mathrm{Fe}}_{50}{\mathrm{Mn}}_{50}$ and enhanced coercivity in thin ${\mathrm{Fe}}_{50}{\mathrm{Mn}}_{50}$. By measuring the magnetization response to a rotating magnetic field, we quantitatively determine the relevant anisotropies and demonstrate that the enhanced coercivity is related to the rotatable uncompensated spins of ${\mathrm{Fe}}_{50}{\mathrm{Mn}}_{50}$. We demonstrate the consequences of the variation of anisotropy with temperature and relate our results to other exchange-biased systems.