Ab-Initio Real-Time Magnon Dynamics in Ferromagnetic and Ferrimagnetic Systems

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Date
2020
Volume
257
Issue
7
Journal
Physica status solidi : B, Basic research
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Publisher
Weinheim : Wiley-VCH
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Abstract

Magnonics—an emerging field of physics—is based on the collective excitations of ordered spins called spin waves. These low-energy excitations carry pure spin currents, paving the way for future technological devices working at low energies and on ultrafast timescales. The traditional ab-initio approach to predict these spin-wave energies is based on linear-response time-dependent density functional theory (LR-TDDFT) in the momentum and frequency regime. Herein, the simulation of magnon dynamics using real-time time-dependent density functional theory is demonstrated, thus extending the domain of ab-initio magnonic studies. Unlike LR-TDDFT, this enables us to observe atom-resolved dynamics of individual magnon modes and, using a supercell approach, the dynamics of several magnon modes can be observed simultaneously. The energies of these magnon modes are concurrent with those found using LR-TDDFT. Next, the complex dynamics of the superposition of magnon modes is studied, before finally studying the element-resolved modes in multisublattice magnetic systems.

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Singh, N., Elliott, P., Dewhurst, J. K., & Gross, E. K. U. (2020). Ab-Initio Real-Time Magnon Dynamics in Ferromagnetic and Ferrimagnetic Systems (Weinheim : Wiley-VCH). Weinheim : Wiley-VCH. https://doi.org//10.1002/pssb.201900654
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CC BY 4.0 Unported