期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 362, 期 -, 页码 97-103出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2014.03.008
关键词
Magneto-electrics; GaFeO3; High field Mossbauer spectroscopy; Magnetic anisotropy
资金
- CSIR, India
Polycrystalline magneto electric Ga2-xFexO3 (0.8 <= x <= 1.2) ceramics are studied with bulk magnetization and Fe-57 Mossbauer measurements. The ferrimagnetic to paramagnetic transition temperature (T-C), saturation magnetization (M-S) and the magnetic anisotropy values are found to vary significantly with the site-disorder of Fe3+ and Ga3+ cations. With the increase of iron content, increase of T-C and M-S, and decrease of magnetic anisotropy are observed. Using low temperature high magnetic held Fe-57 Mossbauer measurements, individual temperature dependence of hyperfine fields and hence magnetization of the three sub-lattices are measured, it is observed that the three sub-lattices have quite a different temperature dependence resulting in the non-monotonous variation or resultant magnetization as measured by bulk magnetic measurements. Definite evidence, using Fe-57 Mossbauer measurements, is submitted to show that the Fe ions at Fe-2 and Ga-2 sites are responsible for the observed magnetic anisotropy, site-disorder induced magnetism and thermo-magnetic irreversible features in (Ga2-xFeO3)-O-x. (C) 2014 Elsevier B.V. All rights reserved.
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