Spin stress contribution to the lattice dynamics of FePt

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dc.contributor.authorvon Reppert, Alexandercs
dc.contributor.authorWillig, Lisacs
dc.contributor.authorPudell, Jan Etiennecs
dc.contributor.authorZeuschner, Steffen Peercs
dc.contributor.authorSellge, Gabrielcs
dc.contributor.authorGanss, Fabiancs
dc.contributor.authorHellwig, Olafcs
dc.contributor.authorArregi Uribeetxebarria, Jon Andercs
dc.contributor.authorUhlíř, Vojtěchcs
dc.contributor.authorCrut, Aureliencs
dc.contributor.authorBargheer, Matiascs
dc.coverage.issue28cs
dc.coverage.volume6cs
dc.date.accessioned2021-05-12T14:54:17Z
dc.date.available2021-05-12T14:54:17Z
dc.date.issued2020-06-01cs
dc.description.abstractInvar-behavior occurring in many magnetic materials has long been of interest to materials science. Here, we show not only invar behavior of a continuous film of FePt but also even negative thermal expansion of FePt nanograins upon equilibrium heating. Yet, both samples exhibit pronounced transient expansion upon laser heating in femtosecond x-ray diffraction experiments. We show that the granular microstructure is essential to support the contractive out-of-plane stresses originating from in-plane expansion via the Poisson effect that add to the uniaxial contractive stress driven by spin disorder. We prove the spin contribution by saturating the magnetic excitations with a first laser pulse and then detecting the purely expansive response to a second pulse. The contractive spin stress is reestablished on the same 100-ps time scale that we observe for the recovery of the ferromagnetic order. Finite-element modeling of the mechanical response of FePt nanosystems confirms the morphology dependence of the dynamics.en
dc.formattextcs
dc.format.extent1-7cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationScience Advances. 2020, vol. 6, issue 28, p. 1-7.en
dc.identifier.doi10.1126/sciadv.aba1142cs
dc.identifier.issn2375-2548cs
dc.identifier.other165274cs
dc.identifier.urihttp://hdl.handle.net/11012/196729
dc.language.isoencs
dc.publisherAAAScs
dc.relation.ispartofScience Advancescs
dc.relation.urihttps://advances.sciencemag.org/content/6/28/eaba1142cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/2375-2548/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectTHERMAL-EXPANSIONen
dc.subjectORIGINen
dc.titleSpin stress contribution to the lattice dynamics of FePten
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-165274en
sync.item.dbtypeVAVen
sync.item.insts2021.05.12 16:54:16en
sync.item.modts2021.05.12 16:14:09en
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Nanomagnetismus a spintronikacs
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Ústav fyzikálního inženýrstvícs
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