自旋-轨道相互作用的局域破缺：Co/FeMn交换偏置的微观起源
Local breaking of the spin-orbit interaction: the microscopic origin of exchange bias in Co/FeMn
摘要：
现代磁性薄膜器件的成功很大程度上归功于界面处的层间耦合和交换相互作用。一个突出的例子是交换偏置（EB），这是在铁磁（F）/反铁磁（AF）系统中发现的磁耦合现象。AF中的未补偿钉扎力矩通过界面耦合到F，导致额外的单向各向异性。结果，F的滞后被移动。这种固定力矩的存在现在被接受，尽管它们的物理性质和起源仍然是未知的。在这里，我们提出了一个彻底的光谱调查的基础上，X射线磁性圆二色性，这是第一次提供直接的信息有关的物理钉扎磁矩。我们的数据清楚地表明，轨道磁矩，这通常是广泛的过渡金属系统淬火，是背后的Co/FeMn交换偏置的驱动力。
英文摘要：
Modern magnetic thin film devices owe their success in large part to effects emerging from interlayer coupling and exchange interaction at interfaces. A prominent example is exchange bias (EB), a magnetic coupling phenomenon found in ferromagnet (F)/antiferromagnet (AF) systems. Uncompensated pinned moments in the AF couple to the F via the interface causing an additional unidirectional anisotropy. As a result, the hysteresis of the F is shifted. The existence of such pinned moments is nowadays accepted although their physical nature and origin is still unknown. Here we present a thorough spectroscopic investigation based on X-ray magnetic circular dichroism which does for the first time provide direct information about the physics of pinned magnetic moments. Our data clearly shows that the orbital magnetic moment, which is usually widely quenched in transition metal systems, is the driving force behind exchange bias in Co/FeMn.
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