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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Magnetic order-dependent phonon properties in 2D magnet CrI3
Ke Wang1, WuXing Zhou2, Yuan Cheng3
1Xidian University, No. 2 Taibai Road, Xi'an, Shaanxi Province 710071, China. wanghai@mail.xidian.edu.cn.
Nanoscale
|June 14, 2021
Summary
Spin influences phononic properties in CrI3 monolayers. Infrared spectra can identify magnetic order, and thermal conductivity changes with magnetic phase, suggesting applications in thermal switching devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Chromium triiodide (CrI3) is a 2D material with interesting magnetic and electronic properties.
- Understanding the interplay between spin and lattice vibrations (phonons) is crucial for novel electronic devices.
Purpose of the Study:
- To theoretically investigate the influence of spin on the phononic properties of CrI3 monolayers.
- To explore the potential of using these spin-phonon interactions for magnetic state identification and thermal management.
Main Methods:
- Systematic theoretical calculations.
- Analysis of infrared-active phonon modes.
- Calculation of thermal expansion coefficients and lattice thermal conductivity.
Main Results:
- Frequencies of two infrared-active modes are significantly dependent on magnetic configuration (ferromagnetic, antiferromagnetic, paramagnetic).
- Thermal expansion coefficients vary distinctly across magnetic phases due to competing phonon modes.
- Lattice thermal conductivity shows sensitivity to magnetic phase, linked to spin-dependent lattice anharmonicity.
Conclusions:
- Infrared spectroscopy can serve as a tool to identify magnetic order in CrI3 monolayers via spin-lattice correlation.
- The observed spin-dependent thermal properties highlight CrI3's potential as a spintronic material for active heat flow control.
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