Magnetic ordering in ultrathin cobalt film covered by an overlayer of noble metals

矫顽力 凝聚态物理 磁化 材料科学 成核 磁各向异性 磁畴 克尔效应 覆盖层 单一领域 磁力显微镜 磁场 化学 冶金 物理 有机化学 量子力学 非线性系统
作者
M. Kisielewski,A. Maziewski,Z. Kurant,M. Tekielak,A. Wawro,L. T. Baczewski
出处
期刊:Journal of Applied Physics [American Institute of Physics]
卷期号:93 (10): 7628-7630 被引量:23
标识
DOI:10.1063/1.1543914
摘要

The spatial distribution of magnetic properties studied by polar Kerr-effect-based magnetometry are carried out on an ultrathin cobalt wedge covered with a silver wedge whose slopes are perpendicular to each other and subsequently capped with a gold layer. The coercivity field was studied as a function of both cobalt thickness d and silver thickness h. A few monolayers of Ag were found to have a substantial influence on the coercivity field. A similar strong influence of silver coverage on the magnetic anisotropy field was observed. Domain structure evolution during magnetization reversal is investigated using an optical microscope. With an increase of the magnetic field, a magnetization reversal process occurs: first by domain nucleation and next by a domain wall movement towards the higher coercivity region of the sample. Changes of the fractal dimension of the domain wall as well as nucleation center density are investigated. A rapid increase of these parameters is observed while d increases towards the value of spin reorientation transition, which goes from easy-axis to easy-plane magnetization. Similar strong changes were observed while decreasing d to the lowest thickness available for observation. The problem discussed here, of tuning magnetic properties by silver–gold structure, is important from both a general physics and an application point of view, especially because of the possibilities for magnetic film patterning.
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