Temperature-dependent ferromagnetic resonance via the Landau-Lifshitz-Bloch equation : Application to FePt

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2014
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Ostler, Tom A.
Ellis, Matthew O. A.
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281043
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FEMTOSPIN - Multiscale Modelling of Femtosecond Spin Dynamics
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Physical Review B. 2014, 90(9), 094402. ISSN 0163-1829. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.90.094402
Zusammenfassung

Using the Landau-Lifshitz-Bloch (LLB) equation for ferromagnetic materials, we derive analytic expressions for temperature-dependent absorption spectra as probed by ferromagnetic resonance. By analyzing the resulting expressions, we can predict the variation of the resonance frequency and damping with temperature and coupling to the thermal bath. We base our calculations on the technologically relevant L10FePt, parametrized from atomistic spin dynamics simulations, with the Hamiltonian mapped from ab initio parameters. By constructing a multimacrospin model based on the LLB equation and exploiting GPU acceleration, we extend the study to investigate the effects on the damping and resonance frequency in μm-sized structures.

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530 Physik
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temperature-dependent, ferromagnetic, Landau-Lifshitz-Bloch, FePt
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ISO 690OSTLER, Tom A., Matthew O. A. ELLIS, Denise HINZKE, Ulrich NOWAK, 2014. Temperature-dependent ferromagnetic resonance via the Landau-Lifshitz-Bloch equation : Application to FePt. In: Physical Review B. 2014, 90(9), 094402. ISSN 0163-1829. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.90.094402
BibTex
@article{Ostler2014Tempe-29327,
  year={2014},
  doi={10.1103/PhysRevB.90.094402},
  title={Temperature-dependent ferromagnetic resonance via the Landau-Lifshitz-Bloch equation : Application to FePt},
  number={9},
  volume={90},
  issn={0163-1829},
  journal={Physical Review B},
  author={Ostler, Tom A. and Ellis, Matthew O. A. and Hinzke, Denise and Nowak, Ulrich},
  note={Article Number: 094402}
}
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