Mechanisms of fast coherent magnetization inversion in ferronanomagnets

•The coupling with the passive resonator is the fastest relaxation mechanism.•The radiation friction has a strong effect on the system in the presence of other mechanisms.•The radiation friction can be comparable to the radiation damping at certain conditions.•For the system with high anisotropy, th...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2017-11, Vol.441, p.604-608
Main Authors: Baydin, A., Henner, V., Sumanasekera, G.
Format: Article
Language:English
Subjects:
Anisotropy
Coherent magnetic relaxation
Data storage
Dipole interactions
Dipoles
Equations of motion
Ferromagnetism
Ferronanomagnets
Friction
Landau-Lifshitz relaxation
Magnetic fields
Magnetic induction
Magnetic moments
Magnetic recording
Magnetic relaxation
Magnetization
Nanoparticles
Numerical analysis
Radiation
Radiation damping
Radiation friction
Studies
Citations: Items that this one cites
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Summary:•The coupling with the passive resonator is the fastest relaxation mechanism.•The radiation friction has a strong effect on the system in the presence of other mechanisms.•The radiation friction can be comparable to the radiation damping at certain conditions.•For the system with high anisotropy, the Landau-Lifshitz relaxation prevails. Magnetic nanoparticles have a wide range of potential applications. The fast magnetization inversion is the goal of magnetic recording and other data storage, logic and communication applications operating at GHz frequencies. Here, we present theoretical studies on mechanisms of fast coherent magnetization inversion in the system of ferromagnetic nanoparticles composed of molecules or clusters with high magnetic moments. The possibilities to accelerate magnetic relaxation are considered: the feedback field from a resonator, radiation friction and Landau-Lifshitz relaxation. Equations of motion for the interparticle dipole-dipole interactions are solved numerically and the role of these relaxation mechanisms has been examined. Radiation friction is shown to be an important factor at certain conditions.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2017.06.045