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

被引：7

作者：

Singh, Nisha ^{[1
]}

Elliott, Peter ^{[1
]}

Dewhurst, J. Kay ^{[2
]}

Gross, E. K. U. ^{[2
,3
]}

Sharma, Sangeeta ^{[1
]}

机构：

[1] Max Born Inst Nonlinear Opt & Short Pulse Spect, Max Born Str 2A, D-12489 Berlin, Germany

[2] Max Planck Inst Microstruct Phys, Weinberg 2, D-06120 Halle, Germany

[3] Hebrew Univ Jerusalem, Inst Chem, Fritz Haber Ctr Mol Dynam, IL-91904 Jerusalem, Israel

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2020年 / 257卷 / 07期

关键词：

element-specific modes; real-time magnons; real-time time-dependent density functional theory;

D O I：

10.1002/pssb.201900654

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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.

引用

页数：9