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| CHANGES IN STRUCTURE, MAGNETIC ANISOTROPY AND MAGNETIC DOMAIN OF AMORPHOUS Gd-Co ALLOY FILMS |
| by Li Fanghua; Wang Yinjun; Teng Chenming (Institute of Physics; Academia Sinica) and Gao Junjie (Tianjin University) |
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Cite this article:
by Li Fanghua; Wang Yinjun; Teng Chenming (Institute of Physics; Academia Sinica) and Gao Junjie (Tianjin University). CHANGES IN STRUCTURE, MAGNETIC ANISOTROPY AND MAGNETIC DOMAIN OF AMORPHOUS Gd-Co ALLOY FILMS. Acta Metall Sin, 1981, 17(4): 418-495.
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Abstract Changes in the structure and the magnetic domain patterns in amorphous Gd-Co alloy films after annealing at room temperature in a low vacuum of 10~(-2) mmHg for 2 weeks as well as heating in a high vacuum of 5×10~(-7) mmHg were investigated by electron diffraction and Lorentz electron microscopy. It was found that the phase separation could be achieved either by annealing at room temperature in low vacuum or by heating in high vacuum.The diffraction intensity profiles of the films and their magnetic domain patterns were changed as a result of phase separation. The nearest neighbor coordination number between Gd and Co atoms was obviously decreased, meanwhile the magnetic bubbles in the domain patterns were apparently decreased or even disappeared, resulting in the fact that the in-plane domain appeared. This probes once again that the magnetic anisotropy in amorphous Gd-Co alloy films is definitely related to the nearest neighbor coordination number between Gd and Co atoms and that the latter may be intuitively shown in the electron diffraction intensity profile.It was also found that during heating at 350℃, Co crystallized first with α-Co as its main product and β-Co the subordinate. The α-Co gradually transformed into β-Co with the increase of temperature. The oxidation of Co had not been observed even at 950℃ while Gd was oxidized seriously before its crystallization.No trace of Gd-Co alloy or metal Gd could be found in the whole process of crystallization.The change of the magnetic domain patterns with the heating temperature was shown in the present paper. The influence of both the phase separation and the degree of short range order on the magnetic anisotropy in films was discussed.
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Received: 18 April 1981
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