Acquisition of vector hysteresis loops from micro-arrays of nano-magnets
Acquisition of vector hysteresis loops from micro-arrays of nano-magnets
复制标题
从纳米磁体微阵列获取矢量磁滞回线
DOI：
10.1016/j.jmmm.2006.03.030
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发表时间：
2006
影响因子：
2.7
通讯作者：
J. Katine
中科院分区：
文献类型：
--
作者：
P. Keatley;V. Kruglyak;R. Hicken;J. Childress;J. Katine
改进的扫描克尔显微镜被用作静态克尔磁力计，以获取尺寸范围为 123 nm 至 10 μm 的方形 Si/Ta(50Å)/Co80Fe20(40Å)/Ni88Fe12(108Å)/Ta(100Å) 元件的面内矢量磁滞回线。纳米级元件排列成4μm大小的方形阵列。激光束聚焦到亚微米点，同时用包含分束偏振器和两个象限光电二极管的光桥检测器记录偏振变化。矫顽场表现出从10μm元件的11Oe到123nm元件的170Oe的非单调增加。随着单元尺寸的减小，观察到通过平行于易面内单轴各向异性轴和硬面内单轴各向异性轴施加场而获得的环的形状变得更加相似。
A modified scanning Kerr microscope has been used as a static Kerr magnetometer to acquire in-plane vector hysteresis loops from square Si/Ta(50Å)/Co80Fe20(40Å)/Ni88Fe12(108Å)/Ta(100Å) elements with size ranging from 123nm to 10μm. The nanoscale elements were arranged in square arrays of 4μm size. The laser beam was focused to a sub-micron spot, while polarization changes were recorded with an optical bridge detector containing a beam-splitting polarizer and two quadrant photodiodes. The coercive field exhibited a non-monotonic increase from 11Oe in the 10μm element to 170Oe in the 123nm elements. Loops acquired with the field applied parallel to the easy and hard in-plane uniaxial anisotropy axes were observed to become more similar in shape as the element size decreased.