Antisite Disorder-induced Exchange Bias Effect in Multiferroic Y2CoMnO6

Abstract

Exchange bias effect in the ferromagnetic double perovskite compound Y${}_2$CoMnO${}_6$, which is also a multiferroic, is reported. The exchange bias, observed below 8~K, is explained as arising due to the interface effect between the ferromagnetic and antiferromagnetic clusters created by {\it antisite} disorder in this material. Below 8~K, prominent ferromagnetic hysteresis with metamagnetic "steps" and significant coercive field, $H_c\approx$ 10~kOe are observed in this compound which has a $T_c\approx$ 75~K. A model based on growth of ferromagnetic domains overcoming the elastic energy of structurally pinned magnetic interfaces, which closely resembles martensitic-like transitions, is adapted to explain the observed effects. The role of {\it antisite} disorder in creating the domain structure leading to exchange bias effect is highlighted in the present work.

4 pages two-column, 4 figures, accepted to Appl. Phys. Lett

References in corpus (3)

• Exchange bias effect in alloys and compounds
• Multicaloric effect in multiferroic Y2CoMnO6
• Metamagnetic behavior and effect of field cooling on sharp magnetization jumps in multiferroic Y2CoMnO6

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