Magnon transport and thermoelectric effects in ultrathin Tm3Fe5 O12/Pt nonlocal devices
Entity
UAM. Departamento de Física de la Materia CondensadaPublisher
American Physical SocietyDate
2022-10-01Citation
10.1103/PhysRevResearch.4.043214
Physical Review Research 4.4 (2022): 043214
ISSN
2643-1564 (online)DOI
10.1103/PhysRevResearch.4.043214Funded by
The possibility of electrically exciting and detecting magnon currents in magnetic insulators has opened exciting perspectives for transporting spin information in electronic devices. However, the role of the magnetic field and the nonlocal thermal gradients on the magnon transport remain unclear. Here, by performing nonlocal harmonic voltage measurements, we investigate magnon transport in perpendicularly magnetized ultrathin Tm3Fe5O12 (TmIG) films coupled to Pt electrodes. We show that the first harmonic nonlocal voltage captures spin-driven magnon transport in TmIG, as expected, and the second harmonic is dominated by thermoelectric voltages driven by current-induced thermal gradients at the detector. The magnon diffusion length in TmIG is found to be λm∼0.3μm at 0.5 T and gradually decays to λm∼0.2μm at 0.8 T, which we attribute to the suppression of the magnon relaxation time due to the increase of the Gilbert damping with field. By performing current-, magnetic field-, and distance-dependent nonlocal and local measurements we demonstrate that the second harmonic nonlocal voltage exhibits five thermoelectric contributions, which originate from the nonlocal spin Seebeck effect and the ordinary, planar, spin, and anomalous Nernst effects. Our work provides a guide on how to disentangle magnon signals from diverse thermoelectric voltages of spin and magnetic origin in nonlocal magnon devices, and establish the scaling laws of the thermoelectric voltages in metal/insulator bilayersProject
info:eu-repo/grantAgreement/EC/H2020/694955/ERC//INSEETO; Gobierno de España. PID2021-122980OA-C53Editor's Version
https://doi.org/10.1103/PhysRevResearch.4.043214Subjects
Electronics Devices; Harmonic Voltages; Magnetic Insulator; Magnetic-Field; Pt-Electrodes; Thermoelectric Voltage; FísicaRights
© 2022 authorsAbstract
The possibility of electrically exciting and detecting magnon currents in magnetic insulators has opened exciting perspectives for transporting spin information in electronic devices. However, the role of the magnetic field and the nonlocal thermal gradients on the magnon transport remain unclear. Here, by performing nonlocal harmonic voltage measurements, we investigate magnon transport in perpendicularly magnetized ultrathin Tm3Fe5O12 (TmIG) films coupled to Pt electrodes. We show that the first harmonic nonlocal voltage captures spin-driven magnon transport in TmIG, as expected, and the second harmonic is dominated by thermoelectric voltages driven by current-induced thermal gradients at the detector. The magnon diffusion length in TmIG is found to be λm∼0.3μm at 0.5 T and gradually decays to λm∼0.2μm at 0.8 T, which we attribute to the suppression of the magnon relaxation time due to the increase of the Gilbert damping with field. By performing current-, magnetic field-, and distance-dependent nonlocal and local measurements we demonstrate that the second harmonic nonlocal voltage exhibits five thermoelectric contributions, which originate from the nonlocal spin Seebeck effect and the ordinary, planar, spin, and anomalous Nernst effects. Our work provides a guide on how to disentangle magnon signals from diverse thermoelectric voltages of spin and magnetic origin in nonlocal magnon devices, and establish the scaling laws of the thermoelectric voltages in metal/insulator bilayers
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Google Scholar:Gao, Jialiang
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Lambert, Charles-Henri
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Schlitz, Richard
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Fiebig, Manfred
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Gambardella, Pietro
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Vélez Centoral, Saul
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