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

Ostler, T. A.; Ellis, M. O.A.; Hinzke, D.; Nowak, U.

Abstract

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.

Citation

Ostler, T. A., Ellis, M. O., Hinzke, D., & Nowak, U. (2014). Temperature-dependent ferromagnetic resonance via the Landau-Lifshitz-Bloch equation: Application to FePt. Physical review B: Condensed matter and materials physics, 90(9), Article 094402. https://doi.org/10.1103/PhysRevB.90.094402

• Journal Article Type: Article
• Acceptance Date: Aug 14, 2014
• Online Publication Date: Sep 2, 2014
• Publication Date: Sep 1, 2014
• Deposit Date: Jun 15, 2022
• Journal: Physical Review B - Condensed Matter and Materials Physics
• Print ISSN: 1098-0121
• Electronic ISSN: 1550-235X
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 90
• Issue: 9
• Article Number: 094402
• DOI: https://doi.org/10.1103/PhysRevB.90.094402
• Public URL: https://hull-repository.worktribe.com/output/4014602