Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4778
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Title: Anomalous second ferromagnetic phase transition as a signature of spinodal decomposition in Fe-doped GeTe diluted magnetic semiconductor
Authors: Tong, F
Hao, JH 
Chen, ZP
Gao, G
Tong, H
Miao, XS
Issue Date: 14-Nov-2011
Source: Applied physics letters, 14 Nov. 2011, v. 99, no. 20, 202508, p. 1-3
Abstract: Structural and magnetic properties of diluted magnetic semiconductor Ge[sub 1-x]Fe[sub x]Te thin films are investigated. The conventional structure analysis shows c-axis orientation with columnar growth of the films and no indication of Fe clusters or second phase. Magnetic measurements combined with theory models reveal that two ferromagnetic phase transitions occur. We consider that the second ferromagnetic phase transition in high Fe content thin film is from a ferromagnetic phase with long range exchange interaction to a superparamagnetic phase with dipole interaction between Fe clusters, which can be viewed as a signature of spinodal decomposition in Ge[sub 1-x]Fe[sub x]Te material.
Keywords: Exchange interactions (electron)
Ferromagnetic materials
Ferromagnetic-paramagnetic transitions
Germanium compounds
Iron compounds
Long-range order
Magnetic thin films
Paramagnetism
Semiconductor thin films
Semimagnetic semiconductors
Spinodal decomposition
Publisher: American Institute of Physics
Journal: Applied physics letters 
ISSN: 0003-6951
EISSN: 1077-3118
DOI: 10.1063/1.3663550
Rights: © 2011 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in F. Tong et al., Appl. Phys. Lett. 99, 202508 (2011) and may be found at http://link.aip.org/link/?apl/99/202508
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