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自从Néel提出磁性材料存在表面各向异性以来,由于它不仅涉及磁性的基本问题;而且对磁性材料的性能还有重要的影响。所以超细微粉的各向异性的研究日益受到重视。已有
Since Néel proposed the existence of surface anisotropy in magnetic materials, it has not only the basic problem of magnetism but also the important influence on the properties of magnetic materials. Therefore, the research on the anisotropy of ultrafine powder is paid more and more attention. Already