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Reversed exchange-bias effect associated with magnetization reversal in the weak ferrimagnet LuFe0.5Cr0.5O3

Abstract : The exchange-bias (EB) effect with sign reversalwas found in LuFe0.5Cr0.5O3 ferrite-chromite, which is a weak ferrimagnet below T-N = 265K, exhibiting antiparallel orientation of the ferromagnetic (FM) moments of the Fe and Cr sublattices due to opposite sign of the Fe-Cr Dzyaloshinskii vector, as compared to that of the Fe-Fe and Cr-Cr. The weak FM moments of the studied compound compensate each other at temperature T-comp = 230 K, leading to the net magnetic moment reversal and to observed negative magnetization, at moderate applied fields, below T-comp. Both vertical and horizontal shifts from the origin were gotten in the field-cooled magnetization hysteresis loops. The EB sign was found to be positive below T-comp and negative above T-comp, with nonmonotonic dependence on cooling field H-cool. It sharply increases at small values of magnetic fields up to H-cool similar to 1 kOe, then remains almost unchanged in the range 1-30 kOe and strongly decreases with further increase of H-cool. This unusual behavior results from the competition of various Dzyaloshinskii-Moriya interactions between Fe3+ and Cr3+ ions.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02174410
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Submitted on : Friday, July 5, 2019 - 9:53:21 AM
Last modification on : Friday, April 24, 2020 - 10:28:08 AM

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I. Fita, V. Markovich, A. S. Moskvin, A. Wisniewski, R. Puzniak, et al.. Reversed exchange-bias effect associated with magnetization reversal in the weak ferrimagnet LuFe0.5Cr0.5O3. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2018, 97 (10), ⟨10.1103/PhysRevB.97.104416⟩. ⟨hal-02174410⟩

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