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Substantially Enhanced Spin Polarization in Epitaxial CrTe2 Quantum Films
Xiaoqian Zhang1, Qiangsheng Lu2, Zhen-Xiong Shen3,4
1Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing, 211189, China.
Researchers probed spin polarization in 2D van der Waals (vdW) magnets like CrTe2. They found enhanced spin polarization in ultrathin films, crucial for low-power spintronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Spintronics
Background:
- 2D van der Waals (vdW) magnets are crucial for low-power electronics.
- High effective spin polarization is needed for advanced spintronic devices.
- Direct probing of spin polarization in 2D magnets remains underexplored.
Purpose of the Study:
- To directly probe spin polarization in 2D vdW ferromagnets.
- To investigate the influence of film thickness on spin polarization.
- To establish 2D ferromagnetic atomic layers as a platform for spintronic devices.
Main Methods:
- Utilized Mott polarimetry to probe spin degrees of freedom in CrTe2 thin films.
- Performed atomic-layer-dependent, spin-resolved measurements.
- Conducted theoretical analysis to corroborate experimental findings.
Main Results:
- Observed pronounced spin-splitting in 50 ML CrTe2 thin films with 7.9% out-of-plane polarization.
- Discovered significantly enhanced spin polarization (23.4%) in a 3 ML CrTe2 film without external magnetic field.
- Correlated spin polarization with film thickness, highlighting the role of magnetic anisotropy and interlayer interactions.
Conclusions:
- Demonstrated intrinsic effective spin polarization in CrTe2 ultrathin films.
- Highlighted the critical influence of film thickness on spin polarization.
- Established 2D ferromagnetic atomic layers as a promising material for vdW-based spintronics.
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