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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
Published on: July 5, 2019
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Layer-resolved magnetic proximity effect in van der Waals heterostructures
Ding Zhong1, Kyle L Seyler1, Xiayu Linpeng1
1Department of Physics, University of Washington, Seattle, WA, USA.
Nature Nanotechnology
|January 29, 2020
Summary
We demonstrate layer-resolved magnetic proximity effects in WSe2/CrI3 heterostructures. Monolayer WSe2 acts as a sensor to map magnetic domains in layered antiferromagnets.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Phenomena
Background:
- Magnetic proximity effects are crucial for spintronic, superconducting, excitonic, and topological phenomena in heterostructures.
- These effects depend heavily on interfacial electronic properties like wavefunction overlap and band alignment.
- The development of magnetic two-dimensional materials enables new avenues for studying proximity effects in van der Waals heterostructures.
Purpose of the Study:
- To investigate layer-resolved magnetic proximity effects in heterostructures composed of monolayer WSe2 and bi/trilayer CrI3.
- To explore the control of interfacial magnetic order and its influence on electronic properties.
- To utilize monolayer WSe2 as a magnetic sensor for mapping antiferromagnetic domain structures.
Main Methods:
- Fabrication of van der Waals heterostructures using monolayer WSe2 and bi/trilayer CrI3.
- Application of magnetic fields to control individual layer magnetization in CrI3.
- Utilizing reflective magnetic circular dichroism (RMCD) measurements.
- Employing monolayer WSe2 as a spatially sensitive magnetic sensor.
Main Results:
- Demonstrated layer-resolved magnetic proximity effects, where spin-dependent charge transfer is dominated by the interfacial CrI3 layer.
- Showcased that the proximity exchange field is sensitive to the overall layered magnetic structure of CrI3.
- Successfully mapped layered antiferromagnetic domain structures at zero magnetic field and antiferromagnetic/ferromagnetic domains at finite fields using WSe2 as a sensor.
Conclusions:
- Monolayer WSe2 can serve as an effective magnetic sensor for probing interfacial magnetic order in van der Waals heterostructures.
- The study provides a method for controlling proximity effects through van der Waals engineering.
- Revealed insights into the manipulation of magnetic order in layered antiferromagnetic materials.
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