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测量了超细Fe微粒比饱和磁化强度σs与平均粒径d的关系,发现σs随d的减小而减小;还测量了升温和降温过程中的σ(T),发现σ(T)随T的变化是不可逆的,且始终存在着σr(T)d(T)。上述现象是由于超细Fe微粒的表面覆盖着氧化层,氧化层内存在着自旋钉扎现象所致。The dependence of σs of ultrafine iron particles on their average diameter d is measured. It is found that the smaller the particles, the smaller their σs. The variation of σ with temperature, σ(T), which is irreversible, is also measured both in temperature rising and dropping processes. The experimental results can be explained by spin pinning in the oxide layers.
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