Stripe-to-bubble transition of magnetic domains at the spin reorientation of (Fe/Ni)/Cu/Ni/Cu(001)
Stripe-to-bubble transition of magnetic domains at the spin reorientation of (Fe/Ni)/Cu/Ni/Cu(001)
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(Fe/Ni)/Cu/Ni/Cu(001) 自旋重定向时磁畴从条带到气泡的转变
DOI：
10.1103/physrevb.79.014429
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发表时间：
2009-01
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用光电子显微镜研究了(Fe/Ni)/Cu/Ni/Cu(001)自旋重取向相变(SRT)过程中的磁畴演化。当(Fe/Ni)层表现出SRT时，垂直磁化的Ni层与(Fe/Ni)层之间的层间耦合作用相当于施加在(Fe/Ni)层上的虚拟垂直磁场。我们发现垂直虚磁场破坏了(Fe/Ni)条形磁畴的上下对称性，从而在薄膜的法向诱导出净磁化强度。此外，当虚拟磁场增加到超过临界场时，条状域相演化为泡状域相。尽管临界场依赖于Fe膜的厚度，但我们发现少数磁畴的面积分数表现出一个普适的值，它决定了条纹到气泡的相变。
Magnetic domain evolution at the spin reorientation transition (SRT) of (Fe/Ni)/Cu/Ni/Cu(001) is investigated using photoemission electron microscopy. While the (Fe/Ni) layer exhibits the SRT, the interlayer coupling of the perpendicularly magnetized Ni layer to the (Fe/Ni) layer serves as a virtual perpendicular magnetic field exerted on the (Fe/Ni) layer. We find that the perpendicular virtual magnetic field breaks the up-down symmetry of the (Fe/Ni) stripe domains to induce a net magnetization in the normal direction of the film. Moreover, as the virtual magnetic field increases to exceed a critical field, the stripe domain phase evolves into a bubble domain phase. Although the critical field depends on the Fe film thickness, we show that the area fraction of the minority domain exhibits a universal value that determines the stripe-to-bubble phase transition.