We studied the magnetic properties of multiferroic spinel Co0.5Fe0.5Cr2O4, especially focusing on the spin-ordering, spin-reorientation, and charge re-distribution effects. From the Rietveld refinement analysis, the crystal structure was identified to be a normal cubic spinel of Fd-3m. Based on the temperature-dependent measurements of the magnetization and magnetic hyperfine field (Hhf), Curie temperature (TC) of Co0.5Fe0.5Cr2O4 was determined to be around 86 K where Hhf ≅ 0. From the change of slope in the M-T curve, the conical-spiral magnetic ordering temperature was determined to be 20 K, which coincides with Hhf measurement. Also, we have observed the decrease in the slope of the electric quadrupole splitting (ΔEQ) curve above 20 K, suggesting that the change in ΔEQ around TS is originated from charge redistribution due to the spin-relocation associated with the distortion of each tetrahedral site around Fe2+ ion above TS. This indicates that Co0.5Fe0.5Cr2O4 has the noncollinear conical-spiral spin ordering with incommensurate spin structure below TS, while above TS, it has ferrimagnetic spin ordering with commensuration in the collinear state. In addition, the Jahn-teller distortion temperature is measured to be around 155 K, since both ΔEQ and Δ1 of 5T2g band decrease rapidly with increasing temperature and disappear around 155 K.
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7 May 2015
Research Article|
Magnetism and Magnetic Materials|
April 27 2015
Spin reorientation in multiferroic spinel Co0.5Fe0.5Cr2O4 with Mössbauer spectroscopy
Bo Ra Myoung;
Bo Ra Myoung
Department of Physics,
Kookmin University
, Seoul 136-702, South Korea
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Chul Sung Kim
Chul Sung Kim
a)
Department of Physics,
Kookmin University
, Seoul 136-702, South Korea
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]. Tel.: +82-2-910-4752. FAX: +82-2-910-5170.
J. Appl. Phys. 117, 17B741 (2015)
Article history
Received:
September 22 2014
Accepted:
December 12 2014
Citation
Bo Ra Myoung, Chul Sung Kim; Spin reorientation in multiferroic spinel Co0.5Fe0.5Cr2O4 with Mössbauer spectroscopy. J. Appl. Phys. 7 May 2015; 117 (17): 17B741. https://doi.org/10.1063/1.4918968
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