000149142 001__ 149142
000149142 005__ 20250125214313.0
000149142 0247_ $$2doi$$a10.1103/PhysRevB.105.184408
000149142 0248_ $$2sideral$$a129147
000149142 037__ $$aART-2022-129147
000149142 041__ $$aeng
000149142 100__ $$0(orcid)0000-0003-0400-8600$$aJiménez-Cavero, Pilar$$uUniversidad de Zaragoza
000149142 245__ $$aTransition of laser-induced terahertz spin currents from torque- to conduction-electron-mediated transport
000149142 260__ $$c2022
000149142 5060_ $$aAccess copy available to the general public$$fUnrestricted
000149142 5203_ $$aSpin 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 ¿-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 ¿-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. © 2022 authors. Published by the American Physical Society.
000149142 536__ $$9info:eu-repo/grantAgreement/EC/H2020/681917/EU/Ultrafast spin transport and magnetic order controlled by terahertz electromagnetic pulses/TERAMAG$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 681917-TERAMAG$$9info:eu-repo/grantAgreement/ES/MICINN-AEI/PID2020-112914RB-I00
000149142 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000149142 590__ $$a3.7$$b2022
000149142 591__ $$aMATERIALS SCIENCE, MULTIDISCIPLINARY$$b157 / 343 = 0.458$$c2022$$dQ2$$eT2
000149142 591__ $$aPHYSICS, CONDENSED MATTER$$b24 / 67 = 0.358$$c2022$$dQ2$$eT2
000149142 591__ $$aPHYSICS, APPLIED$$b50 / 160 = 0.312$$c2022$$dQ2$$eT1
000149142 592__ $$a1.468$$b2022
000149142 593__ $$aCondensed Matter Physics$$c2022$$dQ1
000149142 593__ $$aElectronic, Optical and Magnetic Materials$$c2022$$dQ1
000149142 594__ $$a6.7$$b2022
000149142 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000149142 700__ $$aGueckstock, Oliver
000149142 700__ $$aNádvorník, Lukas
000149142 700__ $$0(orcid)0000-0003-0271-8713$$aLucas, Irene$$uUniversidad de Zaragoza
000149142 700__ $$aSeifert, Tom S.
000149142 700__ $$aWolf, Martin
000149142 700__ $$aRouzegar, Reza
000149142 700__ $$aBrouwer, Piet W.
000149142 700__ $$aBecker, Sven
000149142 700__ $$aJakob, Gerhard
000149142 700__ $$aKläui, Mathias
000149142 700__ $$aGuo, Chenyang
000149142 700__ $$aWan, Caihua
000149142 700__ $$aHan, Xiufeng
000149142 700__ $$aJin, Zuanming
000149142 700__ $$aZhao, Hui
000149142 700__ $$aWu, Di
000149142 700__ $$0(orcid)0000-0003-3724-508X$$aMorellón, Luis$$uUniversidad de Zaragoza
000149142 700__ $$aKampfrath, Tobias
000149142 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000149142 773__ $$g105, 18 (2022), 184408 [11 pp.]$$pPhys. Rev. B$$tPhysical Review B$$x2469-9950
000149142 8564_ $$s915871$$uhttps://zaguan.unizar.es/record/149142/files/texto_completo.pdf$$yVersión publicada
000149142 8564_ $$s2724736$$uhttps://zaguan.unizar.es/record/149142/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000149142 909CO $$ooai:zaguan.unizar.es:149142$$particulos$$pdriver
000149142 951__ $$a2025-01-25-20:57:15
000149142 980__ $$aARTICLE