Precession damping in [Co60Fe40/Pt]5 multilayers with varying magnetic homogeneity investigated with femtosecond laser pulses

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dc.creatorMariana Andrade Boense Tavares
dc.creatorLeandro Hostalácio Freire de Andrade
dc.creatorMaximiliano Delany Martins
dc.creatorGustavo Foscolo de Moura Gomes
dc.creatorLuis Eugenio Fernandez Outon
dc.creatorFranklin Massami Matinaga
dc.date.accessioned2025-02-26T15:11:41Z
dc.date.accessioned2025-09-08T23:34:59Z
dc.date.available2025-02-26T15:11:41Z
dc.date.issued2019
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.format.mimetypepdf
dc.identifier.doihttps://doi.org/10.1063/1.5130458
dc.identifier.issn2158-3226
dc.identifier.urihttps://hdl.handle.net/1843/80456
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofAIP Advances
dc.rightsAcesso Aberto
dc.subjectAnisotropia
dc.subjectMagnetismo
dc.subject.otherMagnetic anisotropy
dc.subject.otherMagnetic materials
dc.subject.otherMagnetic ordering
dc.subject.otherMagnetization dynamics
dc.subject.otherSpin pumping
dc.subject.otherMagnetic force microscopy
dc.subject.otherMagnetron sputtering
dc.subject.otherLandau-Lifshitz-Gilbert equation
dc.subject.otherFemtosecond lasers
dc.subject.otherPhotoexcitations
dc.titlePrecession damping in [Co60Fe40/Pt]5 multilayers with varying magnetic homogeneity investigated with femtosecond laser pulses
dc.typeArtigo de periódico
local.citation.epage125322-4
local.citation.issue12
local.citation.spage125322-1
local.citation.volume9
local.description.resumoWe report on the ultrafast magnetization dynamics of [Co60Fe40/Pt]5 multilayers studied with femtosecond laser pulses. The samples were grown at room temperature by DC magnetron sputtering with Ta capping and Pt buffer layers and present the same thickness and perpendicular magnetic anisotropy as determined by vibrating sample magnetometry. Controlled growth rate of the Pt buffer layer modified the anisotropy fields and magnetic domain sizes as measured by magnetic force microscopy (MFM). An estimation of the average magnetic domain sizes was obtained from the profile of the self-correlation transform of the MFM images. For multilayers having an average magnetic domain size of 490 nm, we report a damped precession of the magnetization which decays with a time constant of ∼100 ps and which has a frequency which varies from 8.4 GHz to 17.0 GHz as the external field increases from 192 mT to 398 mT. Fitting the precession dynamics with the Landau-Lifshitz-Gilbert equation we evaluated the damping α, which decreases from 0.18 to 0.05 with increasing magnetic domain sizes (127 nm to 490 nm). These α values are higher than for single layers suggesting an enhanced scattering and spin pumping effects from the Pt adjacent layers. In addition, the precession frequency increases from 2.04 GHz to 11.50 GHz as the anisotropy field of the multilayers increases from 6.5 kOe to 13.0 kOe. Finally, a comparative analysis between micromagnetic simulations and MFM images allowed us to determine the exchange stiffness (Aex) in the [Co60Fe40/Pt]5 multilayers.
local.identifier.orcidhttps://orcid.org/0000-0001-9857-3373
local.identifier.orcidhttps://orcid.org/0000-0001-6600-6921
local.identifier.orcidhttps://orcid.org/0000-0003-4010-8043
local.identifier.orcidhttps://orcid.org/0000-0002-2869-6092
local.identifier.orcidhttps://orcid.org/0000-0003-3264-337X
local.identifier.orcidhttps://orcid.org/0000-0002-0507-2471
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://pubs.aip.org/aip/adv/article/9/12/125322/1077172/Precession-damping-in-Co60Fe40-Pt-5-multilayers

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