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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Microstructure and magnetism: structure-properties correlations in two-phase Co-S nanocrystalline films
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Microstructure and magnetism: structure-properties correlations in two-phase Co-S nanocrystalline films

机译：微观结构和磁性：两相Co-S纳米晶膜的结构-性能相关性

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摘要

Microstructure, magnetic hysteresis, magnetic anisotropy and magnetic domain structures of Co-S alloy films were investigated in as-prepared state and after annealing. SEM and TEM investigations show that as-prepared films consist of columnar Co nanocrystallites (3-4.5 nm), nanofibrous structure, grown in an amorphous or highly disordered Co-S matrix. For as-prepared films, the hysteresis loops indicate that magnetization is approximately linear with the applied magnetic field up to saturation and both coercivity and remanence are very low. Films displayed long-range, wavy stripe-like, magnetic domain structure and magnetic percolation. The stripe-like domains are closure domains, which transport the magnetic flux of the underlying domains. The domain structure is the result of the competition between perpendicular magnetic anisotropy (PMA), on one side, and dipolar exchange interaction mediated by the soft ferromagnetic amorphous matrix (indirect exchange interaction), on the other side. The structural origin of PMA is mainly attributed to the magnetoelastic anisotropy associated with an in-plane internal biaxial tensile stress and negative magnetostriction. Magnetic properties evolve with annealing temperature as a result of the microstructure change and of the exchange magnetic interaction increase in the films. The results suggest that a nanocrystalline Co-S film behave as a two-phase heterogeneous system which shares some features of both continuous and discontinuous magnetic systems.
机译：研究了Co-S合金薄膜在制备后和退火后的组织，磁滞，磁各向异性和磁畴结构。 SEM和TEM研究表明，所制备的薄膜由在无定形或高度无序的Co-S基质中生长的圆柱状Co纳米晶体（3-4.5 nm），纳米纤维结构组成。对于准备好的薄膜，磁滞回线表明，磁化强度与所施加的磁场直至饱和几乎呈线性关系，矫顽力和剩磁都非常低。薄膜显示出长距离的，波浪状的条纹，磁畴结构和磁渗透。条纹状磁畴是闭合磁畴，其传输下面磁畴的磁通量。磁畴结构是一方面垂直磁各向异性（PMA）与另一侧软铁磁非晶基质介导的偶极交换相互作用（间接交换相互作用）之间竞争的结果。 PMA的结构起源主要归因于与面内双轴拉伸应力和负磁致伸缩有关的磁弹性各向异性。薄膜的微观结构改变和交换磁性相互作用的增加，使磁性随退火温度而变化。结果表明，纳米晶Co-S膜表现为两相异质系统，该系统具有连续和不连续磁系统的某些特征。

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