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PreprintCC BY 4.0arXiv

Stability-threshold control of helicity-selective antiferromagnetic resonance

  • Masato Todani
  • Satoshi Iihama
  • Yuto Moritake
  • Takeo Kato
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Abstract

We study helicity-selective antiferromagnetic resonance in an antiferromagnetic-insulator/nonmagnetic-metal junction with sublattice-dependent damping and spin-orbit torque. By formulating the linearized Landau--Lifshitz--Gilbert equation as a 2x2 non-Hermitian eigenvalue problem, we analyze the complex resonance frequencies and the stability threshold, using MnF2 parameters as a representative example of a uniaxial antiferromagnet. We show that the absorption is strongly enhanced near the stability threshold, where one helicity mode becomes weakly damped, leading to linewidth narrowing and pronounced helicity selectivity in the sub-THz regime. The selected helicity can be switched by reversing the current direction, which reverses the spin-orbit torque acting on the interfacial sublattice. These results identify stability-threshold control as a design principle for electrically tunable helicity-selective antiferromagnetic resonance in uniaxial antiferromagnets.

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Cite

BibTeXRIS
BibTeX
@misc{todani2026stabilitythreshold,
  title = {{Stability-threshold control of helicity-selective antiferromagnetic resonance}},
  author = {Masato Todani and Satoshi Iihama and Yuto Moritake and Takeo Kato},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2607.07488},
  eprint = {2607.07488},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.07488},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Stability-threshold control of helicity-selective antiferromagnetic resonance
AU  - Masato Todani
AU  - Satoshi Iihama
AU  - Yuto Moritake
AU  - Takeo Kato
PY  - 2026
DA  - 2026/09/02
PB  - arXiv
DO  - 10.48550/arxiv.2607.07488
UR  - https://arxiv.org/abs/2607.07488
AB  - We study helicity-selective antiferromagnetic resonance in an antiferromagnetic-insulator/nonmagnetic-metal junction with sublattice-dependent damping and spin-orbit torque. By formulating the linearized Landau--Lifshitz--Gilbert equation as a 2x2 non-Hermitian eigenvalue problem, we analyze the complex resonance frequencies and the stability threshold, using MnF_2 parameters as a representative example of a uniaxial antiferromagnet. We show that the absorption is strongly enhanced near the stability threshold, where one helicity mode becomes weakly damped, leading to linewidth narrowing and pronounced helicity selectivity in the sub-THz regime. The selected helicity can be switched by reversing the current direction, which reverses the spin-orbit torque acting on the interfacial sublattice. These results identify stability-threshold control as a design principle for electrically tunable helicity-selective antiferromagnetic resonance in uniaxial antiferromagnets.
ER  -