Anomalous exchange bias effect in ferromagnetic VI3 flakes

The exchange bias effect, pivotal in magnetic data storage and sensing devices, has been observed not only in interfacial regions but also in intrinsic ferromagnetic materials. Here, we have uncovered a robust and stable exchange bias effect within the layered van der Waals (vdW) ferromagnet VI3 emp...

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Bibliographic Details
Published in:Applied physics letters 2024-03, Vol.124 (13)
Main Authors: Zhang, Xi, Xia, Xiuquan, Liu, Qiye, He, Yonggang, Wang, Le, Lin, Junhao, Mei, Jia-Wei, Cheng, Yingchun, Dai, Jun-Feng
Format: Article
Language:English
Subjects:
Bias
Coercivity
Controllability
Data storage
Dichroism
Exchanging
Ferromagnetic materials
Hysteresis loops
Magnetic domains
Magnetic fields
Magnets
Sensors
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Summary:The exchange bias effect, pivotal in magnetic data storage and sensing devices, has been observed not only in interfacial regions but also in intrinsic ferromagnetic materials. Here, we have uncovered a robust and stable exchange bias effect within the layered van der Waals (vdW) ferromagnet VI3 employing magnetic circular dichroism microscopy. At 10 K, we observed a significant exchange field of approximately 0.1 T, accompanied by random shifts (positive or negative relative to zero magnetic field) after zero-field cooling. Notably, this effect is effectively controllable after field cooling, with shift direction opposing the applied magnetic field. The presence of strong magnetic anisotropic energy within VI3 results in larger coercivity-bound magnetic domains. These domains dictate the neighboring ferromagnetic alignment and induce shifts in the hysteresis loop. Our study not only contributes to comprehending fundamental nanoscale magnetic interactions but also sheds light on emergent phenomena within layered van der Waals magnets.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0194900