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Anisotropy driven spin-reorientation, and two-step magnetic ordering in cubic semiconducting
A D Singha1, M S Seehra2, M Skoulatos3
1Department of Physics, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
Abstract:
The nature of magnetism in the cubic spinelCr0.1Mn0.9Fe0.2Co1.8O4is reported based on systematic investigations by means of magnetization (M), ac susceptibility (χ) and heat capacity (CP) measurements, as well as by neutron diffraction. Structural characterization of the sample was done usingx-ray absorption spectroscopy, neutron and synchrotron diffraction. TheMvs.Tvariation in different magnetic fields indicate ferrimagnetic ordering belowTC= 230 K, followed by a magnetic field and anisotropy induced spin reorientation atTSR∼150 K. With increasingTstarting from 2 K, the coercivityHCand anisotropy fieldHdecrease and become negligible forT>TSR. A model to explain theHCvs.Tdata shows thatTSRis due to reorientation ofMalongHwhenH>HK. TheCPvs.Tdata shows a weakλ-type anomaly atTCwith changes in magnetic entropy smaller than those observed belowTSRsuggesting that long-range magnetic ordering is completed belowTSR. ForTSR
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