Magnetic anisotropy of elongated thin ferromagnetic nano-islands for artificial spin ice arrays
Magnetic anisotropy of elongated thin ferromagnetic nano-islands for artificial spin ice arrays
复制标题
用于人造自旋冰阵列的细长铁磁纳米岛的磁各向异性
DOI：
10.1088/0953-8984/24/29/296001
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
A. R. Pereira
中科院分区：
文献类型：
--
作者：
G. Wysin;W. A. Moura;L. Mól;A. R. Pereira
薄细长铁磁纳米岛的能量被认为是一些不同的形状，纵横比和施加的磁场方向。这些纳米岛颗粒是人工自旋冰材料的重要组成部分。对于低温，单个粒子的磁内能的数值评估作为一个粒子的净磁化方向的函数。这导致对（1）沿颗粒长方向的易磁化轴沿着和（2）沿颗粒薄方向的难磁化轴沿着的有效各向异性常数的估计。采用自旋弛豫算法和退磁场的快速傅立叶变换，求解薄系统的微磁学问题。结果表明，利用不同形状的岛来控制自旋冰材料的平衡和动力学是可能的。
The energetics of thin elongated ferromagnetic nano-islands is considered for some different shapes, aspect ratios and applied magnetic field directions. These nano-island particles are important for artificial spin ice materials. For low temperature, the magnetic internal energy of an individual particle is evaluated numerically as a function of the direction of a particle’s net magnetization. This leads to estimations of effective anisotropy constants for (1) the easy axis along the particle’s long direction, and (2) the hard axis along the particle’s thin direction. A spin relaxation algorithm together with fast Fourier transform for the demagnetization field is used to solve the micromagnetics problem for a thin system. The magnetic hysteresis is also found. The results indicate some possibilities for controlling the equilibrium and dynamics in spin ice materials by using different island geometries.
影响因子：
19.6
作者：
Morgan, Jason P.;Stein, Aaron;Marrows, Christopher H.
通讯作者：
Marrows, Christopher H.