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Handoko, D.,Lee, S.-H.,Kalanda, N. A.,Yu, S.-C.,Oh, S. K.,Kim, D.-H.,Yang, D. S.,Petrov, A. V.,Yarmolich, M. V.,Demyanov, S. E. IEEE 2015 IEEE transactions on magnetics Vol.51 No.11
<P>We report our investigation on structural and magnetic properties of double perovskite Sr<SUB>2</SUB>FeMoO<SUB>6</SUB> (SFMO) films fabricated at different annealing temperatures. Structural properties have been investigated by means of X-ray absorption near-edge spectra and extended X-ray fine structure, where a change of oxidation state has been observed depending on the annealing temperature. It is found that the oxidation state becomes more deficient for a lower annealing temperature, indicating a lower number of unoccupied Fe states with decreasing Mo coordination number. Ordering degree of Fe and Mo ions in SFMO films is found to strongly correlate to the oxidation state, resulting in the subsequent magnetic property change.</P>
Tran Dang Thanh,오석근,김동현,유성조,S.E. Demyanov,N.A. Kalanda,M.V. Yarmolich,L.V. Kovalev 한국물리학회 2014 Current Applied Physics Vol.14 No.6
In this work, the magnetic properties and critical behavior around ferromagneticeparamagnetic (FM ePM) phase transition in Ba1.7La0.3FeMoO6 compound have been investigated in detail. This compound exhibits a second-order magnetic phase transition with Curie temperature TC ¼ 345 K. The critical exponents b, g, and d that are determined by using the modified Arrott plots (MAP), the KouveleFisher (KF) and the critical isotherm analysis agree very well. Our results indicate a coexistence of short-range and long-range ferromagnetic (FM) interactions in Ba1.7La0.3FeMoO6 compound. The existence of long-range FM interactions in this compound can be associated with the crystal structure of materials with longrange Fe/Mo ordering parameter and strength of double-exchange interaction, whereas the existence of the short-range FM interactions can be explained by magnetic inhomogeneity and FM clusters.