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| MAGNETIC PROPERTIES AND M()SSBAUER SPECTRA OF AMORPHOUS (Fe_(1-x)Co_x)_(78)Si_(9.5)B_(12.5) ALLOYS |
| GUO Huiqun; SHEN Baogen; YU Boliang; ZHAN Wenshan; PAN Xiaoshuo (Institute of physics; Academia Sinica; Beijing) (Manuscript received 15 July; 1983) |
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Cite this article:
GUO Huiqun; SHEN Baogen; YU Boliang; ZHAN Wenshan; PAN Xiaoshuo (Institute of physics; Academia Sinica; Beijing) (Manuscript received 15 July; 1983). MAGNETIC PROPERTIES AND M()SSBAUER SPECTRA OF AMORPHOUS (Fe_(1-x)Co_x)_(78)Si_(9.5)B_(12.5) ALLOYS. Acta Metall Sin, 1984, 20(4): 333-339.
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Abstract Thermomagnetic measurements of the amorphous (Fe_(1-x)Co_x)_(78)Si_(9.5)B_(12.5) alloys were made on a magnetic balance in the temperature range from 77 to 1200K under the external field 12 kOe. Conventional Fe~(57) M()ssbauer spectroscopy in a transmission geometry was employed at room temperature. It was found that the average moment per magnetic atom in units of the Bohr magneton decreased from 2.1μ_B for Fe_(78)Si_(9.5)B_(12.5) alloy to 1.2μ_B for Co_(78)Si_(9.5)B_(12.5) with increasing Co content. The variation of T_C with transition metal content for a fixed metalloid composition may be described by the moecular field model. The average hyperfine field at Fe nucleus with increasing Co content of x up to 0.7 first increased from 250 to 278.5 kOe, and then decreased to 262 kOe for x=0.9. Assuming the magnetic moment μ_(Co) per Co atom is independent of content, it was obtained that the magnetic moment μ_(Fe) per Fe atom increased with increasing Co content and gradually approaches to the saturation value, which is 2.6μ_B for x=0.9. The relation between the average hyperfine field (■)_f and the average moment (■) per magnetic atom fol lows equation of (■)_f/(■)=h_0+h_1μ_(Fe)/(■). The values of h_0=42.5kOe and h_1=80kOe were given using the least squares method. It was obtained from M(■)ssbauer spectrum that the angle of magnetization with respect to the plane of the ribbon decreased with increasing Co content, showing the stress-anisotropy energy decreased with increasing Co content.
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Received: 18 April 1984
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