COLLINEARITY AND SPIN FREEZING

An overview will be given on recent Mossbauer and magnetization investigation of the applied field dependence of the magnetic properties of typical systems without strong magnetic anisotropy and showing the absence of magnetic saturation in high fields (including iron-rich spin glass (amorphous Fe_(93)Zr_7), soft ferromagnets (amorphous Fe_(88)Zr₁₂ Fe_(70)Ni_(20)Zr_(10) and Fe_(88)B₁₂) and pure Fe). The results emphasize that shape anisotropy due to surface irregularities causes misalignment between the magnetization and the applied field in the otherwise collinear magnetic structure.