Sensitive detection of irreversible switching in a single FePt nanosized dot
Sensitive detection of irreversible switching in a single FePt nanosized dot
复制标题
灵敏检测单个 FePt 纳米点的不可逆开关
DOI：
10.1063/1.1580994
复制
发表时间：
2003
影响因子：
4
通讯作者：
K. Fukamichi
中科院分区：
文献类型：
--
作者：
N. Kikuchi;S. Okamoto;O. Kitakami;Y. Shimada;K. Fukamichi
在10~300K温度范围内，通过检测反常霍尔效应，测量了由L10-FePt001单晶薄膜制备的直径为60 nm的孤立单点的磁化强度。在整个温度范围内，直径为60 nm~12μm的孤立单点呈现完美的矩形磁化环，其矫顽力几乎是恒定的，而与直径相差很大。磁化反转的激活能约为4×10−19J，相当于磁化壁能乘以磁化壁厚的平方，表明磁化反转是由交换长度尺寸的反转胚胎形核引起的。
Magnetization of an isolated single dot as small as 60 nm in diameter fabricated from a single crystal L10-FePt(001) film has been measured by detection of the anomalous Hall effect in the temperature range from 10 to 300 K. Over the whole temperature range, the dots with diameter ranging from 60 nm to 12 μm exhibit perfect rectangular magnetization loops with coercivity almost constant regardless of the very large difference in diameter. The activation energy has been evaluated to be about 4×10−19 J, equivalent to the domain-wall energy times the square of the domain-wall thickness, suggesting that the magnetization reversals are initiated by nucleation of reversed embryo with the dimension of the exchange length.