Enhanced Exchange Bias Effect by Modulating Relative Ratio of Magnetic Ions in Y2Co2−xMnxO6 (x = 1.0–1.9). Issue 7 (18th March 2019)

• Record Type: Journal Article
• Authors: Oh, Sang Hyub; Moon, Jae Young; Oh, Dong Gun; Choi, Young Jai; Lee, Nara
• Is Part Of: Physica status solidi. Volume 13:Issue 7(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-03-18
• Subjects: double perovskites -- exchange bias effect -- magnetization -- Y2CoMnO6; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.201900008
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : It has recently been reported that the exchange bias (EB) phenomenon in double‐perovskite Y2 CoMnO6 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 Y2 Co2 − x Mn x O6 ( 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 Mn 3+ –O 2− –Mn 3+ bonds. The dependence of the EB effect on the cooling field reveals the maximum EB field at 2 K to be H EB = 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. Abstract : Enhanced exchange bias effect is demonstrated by modulating the relative ratio of transition‐metal ions in Y2 Co2− x Mn x O6 ( x = 1.0–1.9). The large exchange bias effect originates from the adjusted proportions of ferromagnetic and antiferromagnetic phases and the improved interfacial pinning of exchange coupling in the cluster‐glass state. The obtained results provide a foundation for exploring suitable compounds for magnetic functional applications.