Exchange bias using a spin glass
Exchange bias using a spin glass
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DOI：
10.1038/nmat1809
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发表时间：
2007-01-01
期刊：
影响因子：
41.2
通讯作者：
Stamps, Robert L.
中科院分区：
文献类型：
--
作者：
Ali, Mannan;Adie, Patrick;Stamps, Robert L.
交换偏置通常表现为当铁磁体与反铁磁体接触时观察到的磁共振环位移。在这里，我们报告的观察交换偏置与不寻常的功能的铁磁体与自旋玻璃接触，表明这是一个更大的普遍性的现象。铁磁体的易于测量的性质允许访问它们所耦合的玻璃的内部磁自由度。我们的研究结果表明，Co/CuMn双层膜系统表现出所有丰富的现象，与传统的铁磁/反铁磁系统相关的双磁性增强，偏置场的位移和培训效果。然而，出现了惊人的差异，如在一个小的温度范围内的偏置场的方向反转刚好低于阻断温度。我们认为，所有的功能可以理解的范围内的随机场模型的远程振荡Ruderman-Kittel-Kasuya-Yosida（RKKY）耦合自旋。
Exchange bias is commonly manifested as the hysteresis-loop shift observed when a ferromagnet is in contact with an antiferromagnet. Here, we report observations of exchange bias with unusual features of a ferromagnet in contact with a spin glass, demonstrating that this is a phenomenon of greater generality. The easily measured properties of the ferromagnet allow access to the internal magnetic degrees of freedom of the glass to which they are coupled. Our results show that a Co/CuMn bilayer system exhibits all the rich phenomena of coercivity enhancement, bias-field shifts and training effects associated with a conventional ferromagnet/antiferromagnet system. Nevertheless, striking differences arise, such as an orientation reversal of the bias field in a small temperature range just below the blocking temperature. We argue that all features can be understood within the context of a random-field model for long-ranged oscillatory Ruderman-Kittel-Kasuya-Yosida ( RKKY) coupled spins.