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RECENT DEVELOPMENT IN AMORPHOUS MAGNETISM

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This report consists of five topics which have been recently developed by the authors in the amorphous magnetism, i.e., from the fundamental point of view, (i) magnetic properties of amorphous Fe alloys with Y, Lu, La and Zr are investigated, and the possible new magnetic structure will be presented. (ii) The concentration dependence of the Co moment and the concentration independence of the Co-Co exchange constant in amorphous alloys of Co with Y, La and Zr could be indicative of a localized virtual bound state of the Co moment. (iii) Magnetization process of amorphous RE_xCu_<1-x> alloys (RE=Tb, Dy, Ho and Gd) is also shown. From the application point of view, (i) amorphous Fe_xC_<1-x> (0.75≥x≥0.50) were prepared by sputter deposition. Room temperature values for 4πMs ranged from 13000 gauss (x=0.75) to 6500 gauss (x=0.50). Thus the room temperature magnetization is much higher than that for amorphous alloys of Fe with other IV elements. We show that amorphous film of Fe-C can be prepared as low Hc⋍0.10 Oe without the need for post deposition annealing by proper selection of the argon gas pressure. (ii) Effects of substrate bias and annealing on the properties of amorphous GdCo, GdFe and GdCoX (X=Mo, Au and Cu) films are investigated to control the magnitude of uniaxial magnetic anisotropy (Ku), which are useful for magnetic bubble device and magnetic-optic applications.

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