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Exchange bias effect in CaMn1-xRexO3

Abstract : Exchange bias effect in CaMn1-xRexO3 (x <= 0.1) has been investigated. The effect is very small in the samples doped at x = 0.02 and 0.04, but increases monotonously with further increase in Re doping. For x = 0.1, both vertical and horizontal shifts in hysteresis loop of field cooled sample decrease monotonously with increasing temperature and vanish above 70 K, while coercivity disappears only above 90 K upon approaching the N ' eel temperature. Exchange bias field, coercivity, and remanence asymmetry depend sensitively on temperature and maximal measuring field. Magnetic training effect has been studied for x = 0.06, 0.08, 0.1 samples and analyzed using a spin relaxation model. The observed exchange bias is attributed to the low-temperature phase separation into ferromagnetic clusters and the G-type and/or C-type antiferromagnetic matrix.
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Submitted on : Wednesday, June 1, 2022 - 4:54:48 PM
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V. Markovich, I. Fita, A. Wisniewski, R. Puzniak, Christine Martin, et al.. Exchange bias effect in CaMn1-xRexO3. AIP Advances, American Institute of Physics- AIP Publishing LLC, 2017, 7 (5), pp.055801. ⟨10.1063/1.4972798⟩. ⟨hal-02175451⟩



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