6533b7dafe1ef96bd126d9a3
RESEARCH PRODUCT
Spin eigenexcitations of an antiferromagnetic skyrmion
Olena GomonayJeroen Van Den BrinkJeroen Van Den BrinkJeroen Van Den BrinkKarin Everschor-sitteJairo SinovaVolodymyr P. KravchukVolodymyr P. KravchukDavi R. RodriguesYuri GaidideiDenis D. Shekasubject
PhysicsField (physics)Condensed matter physicsStrongly Correlated Electrons (cond-mat.str-el)SkyrmionMagnonCenter (category theory)FOS: Physical sciences02 engineering and technologyRadiusPhysik (inkl. Astronomie)021001 nanoscience & nanotechnologyCondensed Matter::Mesoscopic Systems and Quantum Hall Effect01 natural sciencesCondensed Matter - Strongly Correlated ElectronsDomain wall (magnetism)0103 physical sciencesContinuum (set theory)010306 general physics0210 nano-technologySpin-½description
We theoretically predict and classify the localized modes of a skyrmion in a collinear uniaxial antiferromagnet and discuss how they can be excited. As a central result, we find two branches of skyrmion eigenmodes with distinct physical properties characterized by being low or high energy excitations. The frequency dependence of the low-energy modes scales as $R_0^{-2}$ for skyrmions with large radius $R_0$. Furthermore, we predict localized high-energy eigenmodes, which have no direct ferromagnetic counterpart. Except for the breathing mode, we find that all localized antiferromagnet skyrmion modes, both in the low and high-energy branch, are doubly degenerated in the absence of a magnetic field and split otherwise. We explain our numerical results for the low-energy modes within a string model representing the skyrmion boundary.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-02-26 |