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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Exchange Bias in Weakly Interlayer-Coupled van der Waals Magnet Fe3GeTe2
Hyung Keun Gweon1, Sang Yeop Lee1, Hee Young Kwon1
1Center for Spintronics, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea.
Nano Letters
|February 11, 2021
Summary
van der Waals magnetic materials exhibit unique exchange bias effects due to their layered structure. This discovery advances the potential for practical two-dimensional spintronics applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Van der Waals (vdW) magnetic materials offer a unique platform for exploring low-dimensional magnetism.
- Distinguishing magnetic characteristics of vdW materials from conventional thin films remain under-explored.
Purpose of the Study:
- To investigate magnetic properties unique to vdW magnetic materials.
- To examine the exchange bias effect at the ferromagnetic-antiferromagnetic interface in vdW systems.
Main Methods:
- Studied exchange bias in naturally oxidized vdW ferromagnet Fe3GeTe2.
- Analyzed the antiferromagnetic ordering in the surface oxide layer.
- Investigated the magnitude and thickness dependence of the exchange bias effect.
Main Results:
- Observed exchange bias in Fe3GeTe2, attributed to surface oxide antiferromagnetism.
- The observed exchange bias exhibited unusual thickness dependence, differing from conventional thin films.
- A mechanism involving weak interlayer magnetic coupling in vdW magnets was proposed.
Conclusions:
- The study demonstrates distinct magnetic properties of vdW materials compared to conventional systems.
- Robust and sizable exchange bias persisting to high temperatures was achieved.
- This finding represents a significant advance for practical two-dimensional spintronics.
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