Phase and particle size distribution in magnetoresistive Fe-Cu granular alloys investigated by Mossbauer spectroscopy

被引:9
作者
Rogalski, MS [1 ]
deAzevedo, MMP [1 ]
Sousa, JB [1 ]
机构
[1] INST ATOM PHYS, R-76900 BUCHAREST, ROMANIA
关键词
magnetoresistance; Mossbauer spectroscopy; Fe-Cu granular alloy;
D O I
10.1016/S0304-8853(97)80004-2
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The size distribution of ferromagnetic particles in granular Fe-Cu alloys is derived from the hyperfine field distribution of Fe-57 Mossbauer spectra, on the grounds of collective magnetic excitations associated with the spectral line broadening. A good agreement with the X-ray diffraction results is found for the average particle size estimated from the Mossbauer data. The magnetoresistance of a splat-cooled Fe25Cu75 alloy reaches a maximum of 3% after appropriate annealing and its evolution is correlated with the various Fe phases (ferro, para and superparamagnetic) and particle sizes identified by the Mossbauer data.
引用
收藏
页码:L257 / L263
页数:7
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