Publication Date:
2015-10-15
Description:
The negative magnetization and zero-field cooled exchange bias (ZFC EB) effect are observed in Co 0.8 Cu 0.2 Cr 2 O 4 polycrystalline ceramics. 20% Cu substitution for Co in CoCr 2 O 4 leads to the evident magnetization reversal at the compensation temperature (T comp ∼ 50 K) with applied magnetic field of 500 Oe. Besides, T comp decreases monotonously with increasing applied field, and the negative magnetization finally disappears when the field increases to 9000 Oe. Different temperature dependence of sublattice magnetization at different crystallographic sites is proved to induce the magnetization reversal. In addition, ZFC EB effect can be tuned by measuring temperature and presents the maximum of exchange bias field (H EB ) with ∼2300 Oe at 50 K. This unconventional EB effect can be attributed to the coupling interaction between the two sublattices.
Print ISSN:
0003-6951
Electronic ISSN:
1077-3118
Topics:
Physics
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