Investigation of the local Fe magnetic moments at the grain boundaries of the Ca2FeReO6 double perovskite

Autor:	Kannadka Ramesha, Julio C. Cezar, Jagannatha Gopalakrishnan, E. Granado, C. Azimonte
Rok vydání:	2007
Předmět:	Materials science Magnetic moment Condensed matter physics Magnetic circular dichroism General Physics and Astronomy Crystallography Magnetization Ferromagnetism Electrical resistivity and conductivity visual_art visual_art.visual_art_medium Grain boundary Ceramic Spectroscopy
Zdroj:	Journal of Applied Physics. 101:09H115
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.2714317
Popis:	The local Fe ferromagnetic (FM) moment at the grain boundaries of a ceramic sample of Ca2FeReO6 double perovskite was investigated by means of x-ray magnetic circular dichroism spectroscopy at the Fe L-2,L-3 edges and compared to the overall bulk magnetization. We found that, at the grain boundaries, the Fe FM moments at H=5 T are much smaller than expected and that the MxH curve is harder than in the bulk magnetization. These results suggest a larger degree of Fe/Re antisite disorder at the grain boundaries of this sample, shedding light into the intriguing nonmetallic resistivity behavior despite the reported presence of free carriers. (c) 2007 American Institute of Physics.
Databáze:	OpenAIRE
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