Abstract
We report spin-glass (SG) behavior and large exchange bias effect at low temperature (∼2 K) in Fe-doped hexagonal-YMnO3 (YMn0.8Fe0.2O3) thin film. The thin films of YMnO3 and YMn0.8Fe0.2O3 are deposited on Pt(111)/Al2O3(0001) substrate by pulsed laser deposition method. The temperature dependent magnetization measurements show a characteristic peak for YMn0.8Fe0.2O3 film indicating the presence of SG state as confirmed by memory effect measurements. The hysteresis loops reveal high coercivity in YMn0.8Fe0.2O3 as compared to YMnO3 thin film. Field cooled hysteresis loop measurements at 2 K show the presence of exchange bias in YMn0.8Fe0.2O3 thin film. Maximum exchange bias of ∼909 Oe has been observed for hysteresis loop with cooling field of 20 kOe at 2 K. The exchange bias is further confirmed by training effect as well as negative and positive field cooled hysteresis loops. Exchange bias effect in YMn0.8Fe0.2O3 thin film can be attributed to the interaction between spin-glass/Anti-ferromagnetic phases.
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