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Enhanced Exchange Bias Effect by Modulating Relative Ratio of Magnetic Ions in Y 2 Co 2− x Mn x O 6 ( x = 1.0–1.9)
Author(s) -
Oh Sang Hyub,
Moon Jae Young,
Oh Dong Gun,
Choi Young Jai,
Lee Nara
Publication year - 2019
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201900008
Subject(s) - antiferromagnetism , ferromagnetism , ionic bonding , exchange bias , ion , materials science , cluster (spacecraft) , condensed matter physics , coupling (piping) , phase (matter) , magnetic field , crystallography , analytical chemistry (journal) , chemistry , magnetic anisotropy , magnetization , physics , quantum mechanics , organic chemistry , computer science , metallurgy , programming language , chromatography
It has recently been reported that the exchange bias (EB) phenomenon in double‐perovskite Y 2 CoMnO 6 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 Y 2 Co 2 − x Mn x O 6 ( 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.