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 Néel 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.
Highlights
The exchange bias (EB) effect manifests itself by shifts in the isothermal magnetization vs applied field curves along the field direction and sometimes along the magnetization axis, as well as by an enhancement of the coercive field HC in the field cooled (FC) process
We report on EB effect in CMRO system
In particular we report on the temperature dependence of hysteresis loops in various maximal magnetic fields HMAX, up to 50 kOe and on training effect (TE) for x = 0.06, 0.08 and 0.1 samples
Summary
The exchange bias (EB) phenomenon, discovered by Meiklejohn and Bean,[1] has been intensively studied because of its importance for the magnetic information storage technologies.[2,3,4,5] Usually, the EB effect manifests itself by shifts in the isothermal magnetization vs applied field curves along the field direction and sometimes along the magnetization axis, as well as by an enhancement of the coercive field HC in the field cooled (FC) process. Gorodetsky1 1Department of Physics, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel 2Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, Poland 3Laboratoire CRISMAT, UMR 6508, ISMRA, 14050 Caen Cedex, France (Presented 2 November 2016; received 31 August 2016; accepted 22 September 2016; published online 20 December 2016)
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