Bibliographic Details
| Title: |
Anatomy of inertial magnons in ferromagnets |
| Authors: |
Lomonosov, Alexey M., Temnov, Vasily V., Wegrowe, Jean-Eric |
| Source: |
Phys. Rev. B 104, 054425 (2021) |
| Publication Year: |
2021 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science |
| More Details: |
We analyze dispersion relations of magnons in ferromagnetic nanostructures with uniaxial anisotropy taking into account inertial terms, i.e. magnetic nutation. Inertial effects are parametrized by damping-independent parameter $\beta$, which allows for an unambiguous discrimination of inertial effects from Gilbert damping parameter $\alpha$. The analysis of magnon dispersion relation shows its two branches are modified by the inertial effect, albeit in different ways. The upper nutation branch starts at $\omega=1/ \beta$, the lower branch coincides with FMR in the long-wavelength limit and deviates from the zero-inertia parabolic dependence $\simeq\omega_{FMR}+Dk^2$ of the exchange magnon. Taking a realistic experimental geometry of magnetic thin films, nanowires and nanodiscs, magnon eigenfrequencies, eigenvectors and $Q$-factors are found to depend on the shape anisotropy. The possibility of phase-matched magneto-elastic excitation of nutation magnons is discussed and the condition was found to depend on $\beta$, exchange stiffness $D$ and the acoustic velocity. |
| Document Type: |
Working Paper |
| DOI: |
10.1103/PhysRevB.104.054425 |
| Access URL: |
http://arxiv.org/abs/2105.07376 |
| Accession Number: |
edsarx.2105.07376 |
| Database: |
arXiv |
