Domain formation and long-range spin disorder in Vitroperm
Domain formation and long-range spin disorder in Vitroperm
复制标题
Vitroperm 中的结构域形成和长程自旋紊乱
DOI：
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发表时间：
2003
期刊：
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通讯作者：
J. Weissmüller
中科院分区：
文献类型：
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作者：
A. Michels;R. N. Viswanath;J. Weissmüller
本文研究了纳米晶软磁体Vitroperm （Fe73Si16B7Nb3Cu1）的小角中子散射与磁场的依赖关系，并对其进行了宏观磁各向异性处理。我们展示了如何分析i)散射截面的径向平均值dΣ/dΩ和ii) dΣ/dΩ的变化作为散射矢量方向的函数的场依赖性，以提供关于畴的净磁化方向和畴内内部自旋无序的单独信息。当外加磁场从饱和开始减小时，我们发现两个独立的过程：畴结构的形成，畴的净磁化沿宏观易轴排列，以及自旋取向的静态、纳米级波动幅度的增加。
We present a study of the magnetic-field dependence of the small-angle neutron scattering of the nanocrystalline soft magnet Vitroperm (Fe73Si16B7Nb3Cu1), which was treated so as to exhibit a macroscopic magnetic anisotropy. We show how the field dependences of i) the radial average of the scattering cross-section dΣ/dΩ and ii) the variation of dΣ/dΩ as a function of the orientation of the scattering vector can be analysed to supply separately information on the orientation of the net magnetisation of the domains and on the internal spin disorder within the domains. As the applied magnetic field is decreased starting from saturation, we find that two processes occur independently: the formation of a domain structure with the net magnetisation of the domains aligned along the macroscopic easy axis and the increase in magnitude of static, nanometer-scale fluctuations of the spin orientation.