Microscopic Theory for the Markovian Decay of Magnetization Fluctuations in Nanomagnets

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dc.creatorRousochatzakis, Ioannis
dc.date2007-09-06
dc.date2007-10-29
dc.date.accessioned2026-07-07T09:28:43Z
dc.date.available2026-07-07T09:28:43Z
dc.descriptionWe present a microscopic theory for the phonon-driven decay of the magnetization fluctuations in a wide class of nanomagnets where the dominant energy is set by isotropic exchange and/or uniaxial anisotropy. Based on the Zwanzig-Mori projection formalism, the theory reveals that the magnetization fluctuations are governed by a single decay rate $ω_c$, which we further identify with the zero-frequency portion of the associated self-energy. This dynamical decoupling from the remaining slow degrees of freedom is attributed to a conservation law and the discreteness of the energy spectrum, and explains the omnipresent mono-exponential decay of the magnetization over several decades in time, as observed experimentally. A physically transparent analytical expression for $ω_c$ is derived which highlights the three specific mechanisms of the slowing down effect which are known so far in nanomagnets.
dc.description7 pages
dc.identifierhttps://arxiv.org/abs/0709.0914
dc.identifierhttp://arxiv.org/abs/0709.0914
dc.identifierPhys. Rev. B 76, 214431 (2007)
dc.identifierdoi:10.1103/PhysRevB.76.214431
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/157524
dc.subjectMesoscale and Nanoscale Physics
dc.subjectOther Condensed Matter
dc.titleMicroscopic Theory for the Markovian Decay of Magnetization Fluctuations in Nanomagnets
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