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Tuning the Exchange Bias Effect in 2D van der Waals Ferro‐/Antiferromagnetic Fe3GeTe2/CrOCl Heterostructures
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Tuning the Exchange Bias Effect in 2D van der Waals Ferro‐/Antiferromagnetic Fe3GeTe2/CrOCl Heterostructures
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Journal Article
Tuning the Exchange Bias Effect in 2D van der Waals Ferro‐/Antiferromagnetic Fe3GeTe2/CrOCl Heterostructures
2022
Overview
The exchange bias effect is extremely expected in 2D van der Waals (vdW) ferromagnetic (FM)/antiferromagnetic (AFM) heterostructures due to the high‐quality interface. CrOCl possesses strong magnetic anisotropy at 2D limit, and is an ideal antiferromagnet for constructing FM/AFM heterostructures to explore the exchange bias effect. Here, the exchange bias effect in Fe3GeTe2 (FGT)/CrOCl heterostructures through both anomalous Hall effect (AHE) and reflective magnetic circular dichroism (RMCD) measurements is studied. In the AHE measurements, the exchange bias field (HEB) at 3 K exhibits a distinct increase from ≈150 Oe to ≈450 Oe after air exposure, and such variation is attributed to the formation of an oxidized layer in FGT by analyzing the cross‐sectional microstructure. The HEB is successfully tuned by changing the FGT/CrOCl thickness and the cooling field. Furthermore, a larger HEB of ≈750 Oe at 1.7 K in FGT/CrOCl heterostructure through RMCD measurements is observed, and it is proposed that the larger HEB in RMCD measurements is related to the distribution of uncompensated spins at the interface. This work reveals several intriguing phenomena of the exchange bias effect in 2D vdW magnetic systems, which paves the way for the study of related spintronic devices. The exchange bias effect in ferro‐/antiferromagnetic Fe3GeTe2 (FGT)/CrOCl heterostructure is thoroughly studied through anomalous Hall effect and reflective magnetic circular dichroism (RMCD) measurements. The bias field (HEB) reveals anomaly increase with the presence of an oxidized layer in FGT. The larger HEB in the RMCD measurements can be related to the distribution of uncompensated spins.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
Subject
