Co2Ni/Si(100)薄膜的磁动力学和磁畴形成

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Ranganadha Gopalarao Tanguturi, Pei-Yuan Tsai, Guan-Ting Pan, Pei-hsun Jiang, Jyh-Shen Tsay
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引用次数: 0

摘要

具有低磁化反转开关能和垂直磁各向异性的磁性薄膜是自旋电子器件非常需要的特性。特别是,对多层膜进行了广泛的研究,以产生具有可调垂直磁各向异性的高效自旋转矩开关。从文献来看,通过微波依赖磁测量合金形式Co/Ni的磁动力学和磁各向异性的一般研究仍然有限。本文报道了Co2Ni/Si(100)的磁动力学和磁畴形成。随着Co2Ni厚度的增加,在接近矫顽力的磁场下,磁畴由随机大小变为条形。考虑有效各向异性能和交换刚度常数,可以计算出临界厚度在19 nm左右,这与条纹状磁畴发生的实验结果相当。极化角越大,共振磁场越强的趋势可以解释为容易磁化的轴更倾向于与薄膜垂直的表面。通过考虑线宽中固有阻尼的贡献,可以确定Co2Ni的阻尼系数,并显示出薄膜中不均匀性对磁化取向的影响。我们对Co2Ni磁性动力学的研究为磁性合金在微波自旋电子器件上的进一步应用铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Magnetic dynamics and magnetic domain formation of Co2Ni/Si(100) films

Magnetic dynamics and magnetic domain formation of Co2Ni/Si(100) films
Magnetic thin films with characteristics such as low switching energy of magnetization reversal accompanying perpendicular magnetic anisotropy are highly desirable for spintronic devices. Particularly, multilayers were extensively studied to produce an efficient spin torque switching with tunable perpendicular magnetic anisotropy. From the literature, the general research regarding magnetic dynamics and magnetic anisotropy by microwave-dependent magnetic measurements of Co/Ni in alloy form remains limited. Here we report on the magnetic dynamics and magnetic domain formation for Co2Ni/Si(100). As the Co2Ni thickness increases, magnetic domains change from random sizes to stripe shape at magnetic field close to the coercive field. By considering effective anisotropy energy and exchange stiffness constant, the critical thickness could be calculated to be around 19 nm that is comparable to experimental result of the occurrence of magnetic domains with a striped shape. The trend of the higher resonance magnetic fields for larger polar angle could be explained by the finding that the easy axis of magnetization is more preferred to the surface normal to the film. By considering the intrinsic damping contribution in the linewidth, the damping coefficient for Co2Ni can be determined here and shows the inhomogeneity influencing the magnetization alignment in the films. Our research work on the magnetic dynamics of Co2Ni may pave the way to further applications of magnetic alloy on microwave-based spintronic devices.
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来源期刊
Journal of Alloys and Compounds
Journal of Alloys and Compounds 工程技术-材料科学:综合
CiteScore
11.10
自引率
14.50%
发文量
5146
审稿时长
67 days
期刊介绍: The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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