Enhanced Exchange Bias Effect by Modulating Relative Ratio of Magnetic Ions in Y2Co2−xMnxO6 (x = 1.0–1.9)

Sang Hyub Oh, Jae Young Moon, Dong Gun Oh, Young Jai Choi, Nara Lee

Research output: Contribution to journalArticle

Abstract

It has recently been reported that the exchange bias (EB) phenomenon in double-perovskite Y2CoMnO6 ceramic arises from additional antiferromagnetic (AFM) clusters formed by the anti-sites of ionic disorders in the dominant ferromagnetic (FM) phase. To extensively examine the role of ionic orders and versatile magnetic interactions, we measure the magnetic properties of Y2Co2 − xMnxO6 (x = 1.0–1.9) compounds with different relative ratios of the magnetic ions. Upon increasing the ratio of Mn ions, the FM transition temperature is gradually lowered with a greatly enhanced EB effect for x ≥ 1.4. The measurement of heat capacity and AC magnetic susceptibility in the compound with x = 1.5 suggests the formation of magnetic cluster-glass state from short-range FM order with comparable AFM clusters generated by the formation of Mn3+–O2−–Mn3+ bonds. The dependence of the EB effect on the cooling field reveals the maximum EB field at 2 K to be HEB = 3.19 kOe. The large EB effect originates from the adjusted proportions of FM and AFM phases and the improved interfacial pinning of exchange coupling in the cluster-glass state. Our results, based on intricate magnetic correlations and phases, provide essential clues for exploring suitable ceramic compounds for magnetic functional applications.

Original languageEnglish
Article number1900008
JournalPhysica Status Solidi - Rapid Research Letters
Volume13
Issue number7
DOIs
Publication statusPublished - 2019 Jul

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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