STRUCTURE AND MAGNETIC-PROPERTIES OF SPUTTERED THIN-FILMS OF FE0.79GE0.21

被引:6
作者
HAMDEH, HH
OLIVER, SA
FULTZ, B
GAO, ZQ
机构
[1] NORTHEASTERN UNIV,CTR ELECTROMAGNET RES,BOSTON,MA 02115
[2] CALTECH,PASADENA,CA 91125
关键词
D O I
10.1063/1.354298
中图分类号
O59 [应用物理学];
学科分类号
摘要
Films of Fe0.79Ge0.21 with thicknesses of 300 nm were synthesized by ion beam sputtering, and were annealed at temperatures from 200 to 550-degrees-C. The materials were characterized by x-ray diffractometry, Mossbauer spectrometry, vibrating sample magnetometry, ferromagnetic resonance spectrometry, and electrical resistivity measurements. The as-prepared materials comprised chemically disordered bcc crystallites of sizes less than 20 nm, and were found to have a distribution of internal strains. Upon annealing at temperatures of 250-degrees-C and below, there occurred strain relaxation, some evolution of short range chemical order, and an improvement in soft magnetic properties. The coercive field was a minimum for the sample annealed at 250-degrees-C. Crystallite growth occurred at higher annealing temperatures, accompanied by a transition in several measured parameters from those of ultrafine grained materials to those typical of polycrystalline materials. This trend can be explained with the random anisotropy model. Mossbauer and magnetization measurements indicated that the Ge atoms behave as magnetic holes. The Fe-57 hyperfine magnetic field distribution, and its change during chemical ordering, can be calculated approximately with a model of magnetic response. The large local isomer shifts at Fe-57 atoms near Ge atoms suggest that a local depletion of 4s conduction electron density should be incorporated into the model.
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页码:5117 / 5123
页数:7
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