Negative magnetization and zero-field cooled exchange bias effect in Co0.8Cu0.2Cr2O4 ceramics

作者：Wang, L. G.; Zhu, C. M.; Tian, Z. M.; Luo, H.; Bao, D. L. G. C.; Yuan, S. L.^*

来源：Applied Physics Letters, 2015, 107(15): 152406.

DOI：10.1063/1.4933262

• REVERSAL

The negative magnetization and zero-field cooled exchange bias (ZFC EB) effect are observed in Co0.8Cu0.2Cr2O4 polycrystalline ceramics. 20% Cu substitution for Co in CoCr2O4 leads to the evident magnetization reversal at the compensation temperature (T-comp similar to 50K) 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 similar to 2300 Oe at 50K, This unconventional EB effect can be attributed to the coupling interaction between the two sublattices.

• 出版日期2015-10-12
• 单位华中科技大学