Energy barrier and reversal mechanism in Co∕Pt multilayer nanodot
Energy barrier and reversal mechanism in Co∕Pt multilayer nanodot
复制标题
Co∕Pt多层纳米点的能垒和反转机制
DOI：
10.1063/1.2831785
复制
发表时间：
2008
影响因子：
3.2
通讯作者：
S. Sugimoto
中科院分区：
文献类型：
--
作者：
S. Okamoto;Toshiaki Kato;N. Kikuchi;O. Kitakami;N. Tezuka;S. Sugimoto
利用反常霍耳效应测量技术研究了单个纳米磁体Co ScinPt的反转行为。[Co（0.6-1.4nm）scinPt（2nm）]3多层膜被光刻成直径为200 nm的单点。随着Co厚度的减小，量子点的磁各向异性Ku值从1.3×107变化到2.6× 107 ergscincc。从矩形磁化曲线和Stoner-Wohlfarth型的反转场的角度依赖性，磁化反转的点的结论是进行了一个反向胚胎的成核和立即膨胀。通过反转概率实验评估的磁化反转能垒Eb（0）随着Ku单调增加，并且在300 K和100 K下对Ku的依赖性几乎相同。这些结果表明，反转机制是简单的磁各向异性Ku的主导，是在这个温度范围内是不变的。这种行为可以定性地解释，通过考虑的核…
We have studied the reversal behavior in a single nanomagnet of Co∕Pt by using anomalous Hall effect measurement technique. [Co(0.6–1.4nm)∕Pt(2nm)]3 multilayer films were lithographically patterned into single dots with the diameter of 200nm. The magnetic anisotropy Ku of the dots was varied from 1.3×107 to 2.6×107erg∕cc by decreasing the Co thickness. From the rectangular magnetization curve and the Stoner–Wohlfarth–type angular dependence of reversal field, the magnetization reversal of the dot was concluded to proceed by the nucleation of a reversed embryo and its immediate expansion. The energy barrier Eb(0) for the magnetization reversal evaluated by the reversal probability experiment increased monotonically with Ku and showed the almost same dependence on Ku both at 300 and 100K. These results suggest that the reversal mechanism is simply dominated by the magnetic anisotropy Ku and is invariable in this temperature range. This behavior of Eb(0) can be qualitatively explained by considering the nucl...