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Realizing multiferroics in α-Ga2S3via hole doping: a first-principles study
Junwen Zhong1,2, Peng Wu1, Zengying Ma2
1College of Chemistry and Materials Science, Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Normal University, Wuhu 241000, China. sfwang@mail.ahnu.edu.cn.
Nanoscale
|February 7, 2024
Summary
Gallium sulfide monolayers can achieve multiferroic properties through hole doping, enabling simultaneous ferroelectricity and ferromagnetism. This discovery offers a new pathway for developing advanced 2D multiferroic materials for future devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Multiferroic materials exhibit simultaneous ferroelectric and ferromagnetic properties, crucial for advanced electronic devices.
- Two-dimensional (2D) materials offer unique properties for next-generation technologies.
- Gallium sulfide (Ga2S3) is explored for its potential multiferroic characteristics.
Purpose of the Study:
- To investigate the potential for multiferroicity in intrinsic ferroelectric alpha-Ga2S3 monolayers.
- To explore methods for achieving stable multiferroic properties in 2D Ga2S3.
- To identify pathways for designing 2D multiferroics for device applications.
Main Methods:
- First-principles calculations were employed to study the electronic and magnetic properties of alpha-Ga2S3 monolayers.
- The effects of intrinsic gallium vacancies and hole doping on multiferroicity were investigated.
- The influence of applied strain on ferroelectric polarization was analyzed.
Main Results:
- Intrinsic gallium vacancies in alpha-Ga2S3 introduce ferromagnetism and out-of-plane polarization but hinder ferroelectric stability.
- Applied strain can regulate spontaneous polarization but does not induce ferromagnetism in pristine monolayers.
- Appropriate hole doping concurrently introduces stable ferromagnetism with a high Curie temperature and robust ferroelectricity.
Conclusions:
- Defect-free alpha-Ga2S3 is a prerequisite for intrinsic multiferroicity.
- Hole doping is a viable strategy to achieve stable 2D multiferroics in alpha-Ga2S3.
- This research presents a promising method for designing 2D multiferroic materials for potential device applications.
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