模式交换偏置NiO/Ni样品中的涡旋态
Vortex states in patterned exchange biased NiO/Ni samples
摘要：
利用超导量子干涉仪和微磁学模拟研究了交换偏置NiO/Ni正方形阵列的磁化反转。正方形的边长为0.5、1.5和3.0 $μ$ m。NiO/Ni结构表现出涡旋状磁滞回线和微磁学计算表明，这一功能是由于几个涡旋成核的岛屿。此外，与相同的连续NiO/Ni层相比，对于边长为1.5 $μ$ m的正方形的阵列，交换偏置场的符号改变。我们将涡旋形核和交换偏置场的变化归因于形状和单向各向异性之间的相互作用。
英文摘要：
We investigated the magnetization reversal of arrays of exchange biased NiO/Ni squares with superconducting quantum interference device magnetometry and micromagnetic simulations. The edges of the squares were 0.5, 1.5, and 3.0 $μ$m long. The NiO/Ni structures exhibit vortexlike hysteresis loops and micromagnetic calculations show that this feature is due to several vortices nucleating in the islands. Furthermore, for the arrays with squares of 1.5 $μ$m edge length, the sign of the exchange bias field changes, as compared to the same continuous NiO/Ni layer. We attribute the vortex nucleation and the change of the exchange bias field to the interplay between shape and unidirectional anisotropy.
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