arXiv subjects

Rubén M. Otxoa de Zuazola

Publications and source records attributed to Rubén M. Otxoa de Zuazola.

2 recordsLinked to original sources

arXiv2020

Pair emission from a relativistic domain wall in antiferromagnets

Magnon emission and excitation by a relativistic domain wall at a constant velocity in antiferromagnet is theoretically studied. A pair emission due to a quadratic magnon coupling is shown to be dominant. The emission corresponds in the comoving frame to a vacuum polarization induced by a zero-energy instability of the Lorentz-boosted anomalous response function. The emission rate is sensitive to the magnon dispersion and wall profile, and is significantly enhanced for a thin wall with velocity close to the effective light velocity. The Ohmic damping constant due to magnon excitation at low velocity is calculated.

cond-mat.mes-hall↗

arXiv2020

Collective coordinate study of spin wave emission from dynamic domain wall

We study theoretically the spin wave emission from a moving domain wall in a ferromagnet. Introducing a deformation mode describing a modulation of the wall thickness in the collective coordinate description, we show that thickness variation couples to the spin wave linearly and induces spin wave emission. The dominant emitted spin wave turns out to be polarized in the out-of wall plane ($ϕ$)-direction. The emission contributes to the Gilbert damping parameter proportional to $\hbarω_ϕ/K$, the ratio of the angular frequency $ω_ϕ$ of $ϕ$ and the easy-axis anisotropy energy $K$.

cond-mat.mes-hall↗