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Strongly enhanced room temperature ferromagnetism with saturate magnetization (Ms) of 0.98emu/g (0.71μB/Co) has been obtained in Zn 0.98 Co 0.02 O powders after annealing in H 2 atmosphere at 500°C for 2h. Co 3 O 4 has been clearly resolved in the as-prepared Zn 0.98 Co 0.02 O powders, and significantly suppressed by the hydrogenation. The structural...
A series of Dy(Co 1-X M X ) 2 (M=Al Si, Ga, Ge) compounds has been prepared by arc melting method. The X-ray diffraction analysis reveals that all samples are in the MgCu 2 -type structure. After the substitution, the Curie temperature increases remarkably. A first-order phase transition changes into a second-order one with increasing X. The magnetic entropy...
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