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Evidence for room temperature ferromagnetism in CuxZn1-xO from magnetic studies in CuxZn1-xO/CuO composite

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5 Author(s)
Seehra, M.S. ; Department of Physics, West Virginia University, Morgantown, West Virginia 26506-6315 ; Dutta, P. ; Singh, V. ; Zhang, Y.
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Magnetic studies in bulk 57% CuxZn1-xO/43% CuO composite prepared chemically with x=0.10 (0.03) are reported. Temperature dependence of the magnetic susceptibility shows clear signature of the Néel temperature TN≃230 K for pure CuO. Hysteresis loop studies in the zero-field-cooled sample show room-temperature ferromagnetism with coercivity Hc≃50 Oe at 300 K with strong temperature dependence for T≪300 K. A negative exchange bias He at 5 K is observed when the sample is cooled from RT in H=20 kOe, and its temperature dependence yields He→0 at TN=230 K of CuO. These results and the temperature dependence of remanence Mr provide strong evidence that the CuxZn1-xO phase with x≃0.10 is a ferromagnet with Tc≃400 K. An electron magnetic resonance signal due to Cu2+ substituting for Zn2+ in CuxZn1-xO is also observed.

Published in:

Journal of Applied Physics  (Volume:101 ,  Issue: 9 )