Dot size dependence of magnetic properties in microfabricated L10-FePt (001) and L10-FePt (110) dot arrays
Dot size dependence of magnetic properties in microfabricated L10-FePt (001) and L10-FePt (110) dot arrays
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DOI：
10.1063/1.2335391
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发表时间：
2006-08
影响因子：
3.2
通讯作者：
T. Seki;T. Shima;K. Yakushiji;K. Takanashi;G. Li;S. Ishio
中科院分区：
文献类型：
--
作者：
T. Seki;T. Shima;K. Yakushiji;K. Takanashi;G. Li;S. Ishio
利用电子束光刻和氩离子蚀刻技术制备了具有明确几何形状的L10-FePt（001）和L10-FePt（110）点阵列。点的横向大小变化范围从0.2×0.2to5×5μm2。垂直磁化的FePt（001）点的矫顽力（Hc）随点尺寸的减小而增大。另一方面，在平面内磁化的FePt（110）点的情况下，Hc与FePt（001）点的点位大小依赖关系完全不同，Hc随着点位大小的减小而略有下降。在600℃退火后，FePt（001）和FePt（110）点的Hc值都显著增强，但点尺寸依赖性与退火前相似。所有点的磁化反转都是通过反转畴的成核和随后的畴壁扩展发生的。
L10-FePt (001) and L10-FePt (110) dot arrays with well-defined geometry were fabricated through the use of electron beam lithography and Ar ion etching. The lateral size of dots was varied in the range from 0.2×0.2to5×5μm2. Coercivity (Hc) for the perpendicularly magnetized FePt (001) dots increases with decreasing the dot size. In the case of the FePt (110) dots with in-plane magnetization, on the other hand, the dot size dependence of Hc is completely different from that for FePt (001) dots: Hc shows a slight decrease as the dot size decreases. After annealing at 600°C, the values of Hc for both FePt (001) and FePt (110) dots are remarkably enhanced although the dot size dependence shows similar behavior to that before annealing. The magnetization reversal for all the dots occurs through the nucleation of reversed domains and subsequent domain wall propagation.