Gutenberg Open Science: Transition of laser-induced terahertz spin currents from torque- to conduction-electron-mediated transport

Please use this identifier to cite or link to this item: http://doi.org/10.25358/openscience-7464

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DC Field	Value	Language
dc.contributor.author	Jimenez-Cavero, Pilar	-
dc.contributor.author	Gueckstock, Oliver	-
dc.contributor.author	Nádvorník, Lukáš	-
dc.contributor.author	Lucas, Irene	-
dc.contributor.author	Seifert, Tom S.	-
dc.contributor.author	Wolf, Martin	-
dc.contributor.author	Rouzegar, Reza	-
dc.contributor.author	Brouwer, Piet W.	-
dc.contributor.author	Becker, Sven	-
dc.contributor.author	Jakob, Gerhard	-
dc.contributor.author	Kläui, Mathias	-
dc.contributor.author	Guo, Chenyang	-
dc.contributor.author	Wan, Caihua	-
dc.contributor.author	Han, Xiufeng	-
dc.contributor.author	Jin, Zuanming	-
dc.contributor.author	Zhao, Hui	-
dc.contributor.author	Wu, Di	-
dc.contributor.author	Morellón, Luis	-
dc.contributor.author	Kampfrath, Tobias	-
dc.date.accessioned	2022-08-01T09:06:30Z	-
dc.date.available	2022-08-01T09:06:30Z	-
dc.date.issued	2022	-
dc.identifier.uri	https://openscience.ub.uni-mainz.de/handle/20.500.12030/7478	-
dc.description.abstract	Spin transport is crucial for future spintronic devices operating at bandwidths up to the terahertz range. In F\|N thin-film stacks made of a ferromagnetic/ferrimagnetic layer F and a normal-metal layer N, spin transport is mediated by (1) spin-polarized conduction electrons and/or (2) torque between electron spins. To identify a crossover from (1) to (2), we study laser-driven spin currents in F\|Pt stacks where F consists of model materials with different degrees of electrical conductivity. For the magnetic insulators yttrium iron garnet, gadolinium iron garnet (GIG) and γ -Fe2O3, identical dynamics is observed. It arises from the terahertz interfacial spin Seebeck effect (SSE), is fully determined by the relaxation of the electrons in the metal layer, and provides a rough estimate of the spin-mixing conductance of the GIG/Pt and γ -Fe2O3/Pt interfaces. Remarkably, in the half-metallic ferrimagnet Fe3O4 (magnetite), our measurements reveal two spin-current components with opposite direction. The slower, positive component exhibits SSE dynamics and is assigned to torque-type magnon excitation of the A- and B-spin sublattices of Fe3O4. The faster, negative component arises from the pyrospintronic effect and can consistently be assigned to ultrafast demagnetization of minority-spin hopping electrons. This observation supports the magneto-electronic model of Fe3O4. In general, our results provide a route to the contact-free separation of torque- and conduction-electron-mediated spin currents.	en_GB
dc.language.iso	eng	de
dc.rights	CC BY	*
dc.rights.uri	https://creativecommons.org/licenses/by/4.0/	*
dc.subject.ddc	530 Physik	de_DE
dc.subject.ddc	530 Physics	en_GB
dc.title	Transition of laser-induced terahertz spin currents from torque- to conduction-electron-mediated transport	en_GB
dc.type	Zeitschriftenaufsatz	de
dc.identifier.doi	http://doi.org/10.25358/openscience-7464	-
jgu.type.contenttype	Scientific article	de
jgu.type.dinitype	article	en_GB
jgu.type.version	Published version	de
jgu.type.resource	Text	de
jgu.organisation.department	FB 08 Physik, Mathematik u. Informatik	de
jgu.organisation.number	7940	-
jgu.organisation.name	Johannes Gutenberg-Universität Mainz	-
jgu.rights.accessrights	openAccess	-
jgu.journal.title	Physical review : B	de
jgu.journal.volume	105	de
jgu.journal.issue	18	de
jgu.pages.alternative	184408	de
jgu.publisher.year	2022	-
jgu.publisher.name	American Physical Society	de
jgu.publisher.place	Ridge, NY	de
jgu.publisher.issn	2469-9950	de
jgu.organisation.place	Mainz	-
jgu.subject.ddccode	530	de
jgu.publisher.doi	10.1103/PhysRevB.105.184408	de
jgu.organisation.ror	https://ror.org/023b0x485	-
Appears in collections:	JGU-Publikationen

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