Magnetization reversal and nonexponential relaxation via instabilities of internal spin waves in nanomagnets

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dc.creatorGaranin, D. A.
dc.creatorKachkachi, H.
dc.creatorReynaud, L.
dc.date2006-09-04
dc.date2008-05-05
dc.date.accessioned2026-07-07T09:36:44Z
dc.date.available2026-07-07T09:36:44Z
dc.descriptionA magnetic particle with atomic spins ordered in an unstable direction is an example of a false vacuum that decays via excitation of internal spin waves. Coupled evolution of the particle's magnetization (or the vacuum state) and spin waves, considered in the time-dependent vacuum frame, leads to a peculiar relaxation that is very fast at the beginning but slows down to a nonexponential long tail at the end. The two main scenarios are linear and exponential spin-wave instabilities. For the former, the longitudinal and transverse relaxation rates have been obtained analytically. Numerical simulations show that the particle's magnetization strongly decreases in the middle of reversal and then recovers.
dc.description6 EPL pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0609074
dc.identifierhttp://arxiv.org/abs/cond-mat/0609074
dc.identifierEurophys. Letters 82 (2008) 17007
dc.identifierdoi:10.1209/0295-5075/82/17007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/160222
dc.subjectStatistical Mechanics
dc.subjectMaterials Science
dc.titleMagnetization reversal and nonexponential relaxation via instabilities of internal spin waves in nanomagnets
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