Uncompensated antiferromagnetic spins at the interface in Mn–Ir based exchange biased bilayers
Uncompensated antiferromagnetic spins at the interface in Mn–Ir based exchange biased bilayers
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DOI：
10.1063/1.2710216
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发表时间：
2007-04
影响因子：
3.2
通讯作者：
M. Tsunoda;S. Yoshitaki;Y. Ashizawa;C. Mitsumata;Tetsuya Nakamura;H. Osawa;T. Hirono;Dong Young Kim;M. Takahashi
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文献类型：
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作者：
M. Tsunoda;S. Yoshitaki;Y. Ashizawa;C. Mitsumata;Tetsuya Nakamura;H. Osawa;T. Hirono;Dong Young Kim;M. Takahashi
利用透射模式的X射线磁性圆二色性谱（XMCD）研究了Mn-Ir/铁磁（FM）双层膜中未补偿反铁磁（AFM）自旋的微观起源.随着AFM层厚度的增加，Mn L边的共振吸收幅度自然增加，但XMCD幅度变化不大。当FM层材料被修改时，Mn L边缘的XMCD信号不仅在其幅度上而且在其符号上都发生了急剧变化。没有FM层，XMCD信号消失。这些事实清楚地意味着，未补偿的Mn组分是通过FM和AFM层之间的交换相互作用引起的，并且定位在非常界面处。在经典海森堡模型框架下的微磁学模拟很好地支持了上述结论。
The microscopic origin of the uncompensated antiferromagnetic (AFM) spins was investigated by means of the x-ray magnetic circular dichroism (XMCD) spectroscopy with transmission mode for Mn–Ir/ferromagnetic (FM) bilayers. As the AFM layer thickness increases, resonant absorption magnitude of Mn L edge naturally increases, but the XMCD magnitude does not change so much. When the FM layer material is modified, the XMCD signal of Mn L edge drastically changes not only in its magnitude but also in its sign. The XMCD signal vanishes without the FM layer. These facts clearly mean that the uncompensated Mn components are induced through the exchange interaction between the FM and the AFM layers and are localized at the very interface. Micromagnetic simulation within the framework of the classical Heisenberg model well supported the above conclusion.