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Phenomenology of reactive and dissipative nutation in antiferromagnets
Abstract
We formulate equations of motion for uniform magnetization dynamics in multisublattice magnets, with emphasis on a recently proposed inertial damping torque. We include intra- and intersublattice contributions to Gilbert damping, reactive inertia, and inertial damping. For a two-sublattice uniaxial antiferromagnet in an easy-axis static magnetic field, we derive the dynamical magnetic susceptibilities and approximate eigenfrequencies across all field-dependent equilibrium phases. In particular, we show how inertial damping affects the relaxation of the nutational modes and propose an experimental protocol to determine the dynamical coefficients.
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BibTeX
@misc{syljuasen2026phenomenology,
title = {{Phenomenology of reactive and dissipative nutation in antiferromagnets}},
author = {Erlend Syljuåsen and Hans Gløckner Giil and Arne Brataas},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.06145},
eprint = {2610.06145},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.06145},
}
RIS
TY - UNPB
TI - Phenomenology of reactive and dissipative nutation in antiferromagnets
AU - Erlend Syljuåsen
AU - Hans Gløckner Giil
AU - Arne Brataas
PY - 2026
DA - 2026/10/05
PB - arXiv
DO - 10.48550/arxiv.2610.06145
UR - https://arxiv.org/abs/2610.06145
AB - We formulate equations of motion for uniform magnetization dynamics in multisublattice magnets, with emphasis on a recently proposed inertial damping torque. We include intra- and intersublattice contributions to Gilbert damping, reactive inertia, and inertial damping. For a two-sublattice uniaxial antiferromagnet in an easy-axis static magnetic field, we derive the dynamical magnetic susceptibilities and approximate eigenfrequencies across all field-dependent equilibrium phases. In particular, we show how inertial damping affects the relaxation of the nutational modes and propose an experimental protocol to determine the dynamical coefficients.
ER -