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

Ostler, Thomas; Ellis, Matthew O. A.; Hinzke, Denise; Nowak, Ulrich

doi:10.1103/physrevb.90.094402

Cited by 26 publications

(19 citation statements)

References 41 publications

(85 reference statements)

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“…In order to effect a qualitative illustration of surface effects we use the damping calculated from the Landau-Lifshitz-Bloch equation [17]. An analytical solution to the variation of damping with temperature exists in the LLB description, as given by Garanin [17] and Ostler et al [16]. The effective damping as derived within the LLB description is given by:…”

Section: Grid-search Methodsmentioning

confidence: 99%

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Model of Magnetic Damping and Anisotropy at Elevated Temperatures: Application to Granular FePt Films

et al. 2020

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Understanding the damping mechanism in finite size systems and its dependence on temperature is a critical step in the development of magnetic nanotechnologies. In this work, nano-sized materials are modeled via atomistic spin dynamics, the damping parameter being extracted from Ferromagnetic Resonance (FMR) simulations applied for FePt systems, generally used for heat-assisted magnetic recording media (HAMR). We find that the damping increases rapidly close to T C and the effect is enhanced with decreasing system size, which is ascribed to scattering at the grain boundaries. Additionally, FMR methods provide the temperature dependence of both damping and the anisotropy, important for the development of HAMR. Semi-analytical calculations show that, in the presence of a grain size distribution, the FMR linewidth can decrease close to the Curie temperature due to a loss of inhomogeneous line broadening. Although FePt has been used in this study, the results presented in the current work are general and valid for any ferromagnetic material.

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Section: Grid-search Methodsmentioning

confidence: 99%

“…Ostler et al [16] have successfully calculated the temperature dependence of damping in FePt bulk and thin-film systems based on the Landau-Lifshitz-Bloch (LLB) equation [17], showing an increased damping for thin-film systems, in comparison with the bulk case. The LLB equation is derived for a bulk material.…”

Section: Introductionmentioning

confidence: 99%

Model of Magnetic Damping and Anisotropy at Elevated Temperatures: Application to Granular FePt Films

et al. 2020

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“…One example is ferromagnetic resonance, where the LLB equation was used by Ostler et al [131] to derive analytic expressions for temperature-dependent absorption spectra as probed by ferromagnetic resonance. By constructing a multimacrospin model the study was extended to investigate the effects on the damping and resonance frequency in micrometre-sized structures.…”

Section: Other Applicationsmentioning

confidence: 99%

Fundamentals and applications of the Landau–Lifshitz–Bloch equation

Atxitia

Hinzke

Nowak

2016

J. Phys. D: Appl. Phys.

102

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The influence of thermal excitations on magnetic materials is a topic of increasing relevance in the theory of magnetism. The Landau-Lifshitz-Bloch equation describes magnetisation dynamics at finite temperatures. It can be considered as an extension of already established micromagnetic methods with a comparable numerical effort. This review is a brief summary of this new field of research, with a focus on the fundamentals of the Landau-Lifshitz-Bloch equation, its connection with the stochastic Landau-Lifshitz equation, and its applications in modern magnetism.

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“…[15]. The micromagnetic model was constructed using the Landau-Lifshitz-Bloch equation of motion for magnetic macrospins [19,20] [21].…”

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confidence: 99%

Strain Induced Vortex Core Switching in Planar Magnetostrictive Nanostructures

et al. 2015

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The dynamics of magnetic vortex cores is of great interest because the gyrotropic mode has applications in spin torque driven magnetic microwave oscillators, and also provides a means to flip the direction of the core for use in magnetic storage devices. Here, we propose a new means of stimulating magnetization reversal of the vortex core by applying a time-varying strain gradient to planar structures of the magnetostrictive material Fe(81)Ga(19) (Galfenol), coupled to an underlying piezoelectric layer. Using micromagnetic simulations we have shown that the vortex core state can be deterministically reversed by electric field control of the time-dependent strain-induced anisotropy.

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

Cited by 26 publications

References 41 publications

Model of Magnetic Damping and Anisotropy at Elevated Temperatures: Application to Granular FePt Films

Model of Magnetic Damping and Anisotropy at Elevated Temperatures: Application to Granular FePt Films

Fundamentals and applications of the Landau–Lifshitz–Bloch equation

Strain Induced Vortex Core Switching in Planar Magnetostrictive Nanostructures

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