Role of interfacial uncompensated antiferromagnetic spins in unidirectional anisotropy in Ni81Fe19/CoO bilayers (invited)
Role of interfacial uncompensated antiferromagnetic spins in unidirectional anisotropy in Ni81Fe19/CoO bilayers (invited)
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DOI：
10.1063/1.367721
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发表时间：
1998-10
影响因子：
3.2
通讯作者：
K. Takano;R. Kodama;A. Berkowitz;W. Cao;G. Thomas
中科院分区：
文献类型：
--
作者：
K. Takano;R. Kodama;A. Berkowitz;W. Cao;G. Thomas
反铁磁CoO薄膜表面的未补偿自旋在场冷后从T>TN表现出与Ni_（81）Fe_（19）/CoO双层膜交换场相同的热释磁磁化强度。这表明这些界面未补偿的自旋是单向各向异性的原因。这些界面的未补偿的自旋的密度的计算的基础上的模型预测的交换场的正确大小，以及所观察到的平均界面晶粒尺寸的反向依赖。
The uncompensated spins on the surfaces of antiferromagnetic CoO films exhibit a thermoremanent magnetization after field cooling from T>TN that has the same temperature dependence as the exchange field of Ni81Fe19/CoO bilayers after field cooling. This suggests that these interfacial uncompensated spins are responsible for unidirectional anisotropy. A model based on a calculation of the density of these interfacial uncompensated spins predicts the correct magnitude of the exchange field, as well as the observed inverse dependence on average interfacial grain size.