Spin‐thermoelectric voltage in longitudinal SSE elements incorporating LPE YIG films and polycrystalline YIG slabs with an ultrathin Pt layer

Imamura, Masaaki; Asada, Hironori; Tashima, Daisuke; Kitagawa, Jiro

doi:10.1002/eej.23232

Cited by 8 publications

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A preparation of films by liquid phase epitaxy (LPE) and the STE voltage measurements have been previously described in [7]. FMR measurements were made at a resonance frequency of 9.4 GHz by using a JEOL (Japan Electron Optics Laboratory Co., Ltd.) JES‐FE2XGS ESR spectrometer with a TE 011 cavity.…”

Section: Methodsmentioning

confidence: 99%

Spin‐Thermoelectric Generation of Insulator‐Based Generators Incorporating a Single‐Crystal Yttrium Iron Garnet Film in Relation to Domain Magnetization Processes

Imamura,

Asada,

Matsuda

et al. 2023

IEEJ Transactions Elec Engng

Self Cite

View full text Add to dashboard Cite

Normalized VSTE–H loops measured for generators fabricated from LPE‐grown yttrium iron garnet Y3–xBixFe5O12 (YIG/Bi:YIG) films agree well with the normalized M–H curves observed for those films by using a vibrating sample magnetometer. VSTE and M are the spin‐thermoelectric (STE) voltage and the YIG/Bi:YIG magnetization depending on an external field H, respectively. The coincidence between VSTE–H loops and M–H curves indicates that VSTE strongly depends on the magnetic property of ferrimagnetic insulator YIG films incorporated in STE generators. We try explaining the STE generation with VSTE–H loops from a viewpoint of domain magnetization processes in single‐crystal YIG/Bi:YIG films grown by liquid phase epitaxy (LPE). We exemplify that our idea about the fundamental mechanism of STE generation in an insulator‐based generator also well explains the mode of spin waves generated under a temperature gradient ∇T parallel to a plane of Pt/YIG bilayer interface. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

show abstract

Section: Methodsmentioning

confidence: 99%

Spin‐Thermoelectric Generation of Insulator‐Based Generators Incorporating a Single‐Crystal Yttrium Iron Garnet Film in Relation to Domain Magnetization Processes

Imamura,

Asada,

Matsuda

et al. 2023

IEEJ Transactions Elec Engng

Self Cite

View full text Add to dashboard Cite

show abstract

Spin‐Thermoelectric Generation Associated with Magnetization Dynamics in the Insulator‐Based Generators Fabricated from Liquid Phase Epitaxial Yttrium Iron Garnet, Bi‐Substituted YIG and Bi‐ and Al‐Substituted YIG Films

Imamura,

Asada,

Matsuda

et al. 2024

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

An insulator‐based spin‐thermoelectric (STE) generator is composed of a thin paramagnetic metal (PM: Pt) layer for generating the STE voltage VSTE via the inverse spin Hall effect and a ferrimagnetic insulator (FMI) film or slab used for producing spin‐wave spin currents due to a temperature gradient . Yttrium iron garnet (YIG) is a key material used for the FMI of STE generators. We examined in detail the ferromagnetic resonance (FMR) properties of YIG (Y3Fe5O12), Bi‐substituted YIG (Y3‐xBixFe5O12) and Bi‐ and Al‐substituted YIG (Y3‐xBixFe5‐yAlyO12) films grown by liquid phase epitaxy (LPE). Bi‐substituted YIG films exhibited the large FMR damping and high STE voltage when the films were incorporated in the STE generator. The LPE‐grown Y2.35Bi0.65Fe5O12 film exhibited the FMR linewidth ΔH of 30 mT and the VSTE of 70 μV for the ∇T of . This paper comprehensively presents the origin of the STE generation in the insulator‐based generators on the basis of the results of FMR and STE measurements. To clarify the origin of STE generation in the generators fabricated from single crystal YIG (YIG, Bi‐substituted YIG and Bi‐ and Al‐substituted YIG) films grown by LPE, three principal factors are explained: (a) thermal energy transfer from the phonon system to the spin system, which strengthens the heat excitation of spin precession, through the spin–orbit coupling enhanced by the growth‐induced magnetic anisotropy of LPE‐grown YIG films, (b) in the YIG films incorporated in the STE generators, the generation of spin‐wave spin currents owing its origin to the ferromagnetic spin exchange interaction acting between neighboring spins due to , and (c) how the spin currents pumped into the Pt layer from the YIG film at the Pt/YIG bilayer interface are affected by the magnetization processes of single crystal YIG films. It is concluded that the STE generation of insulator‐based STE generators can be explained from a viewpoint of the spin dynamics under the effect of in the Pt/YIG bilayer structure. © 2024 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

show abstract

Characteristics of spin-thermoelectric generators enhanced by incorporating liquid phase epitaxial Bi-substituted YIG films as a ferrimagnetic insulator

Imamura

Asada

Nishimura

et al. 2022

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

Spin‐thermoelectric voltage in longitudinal SSE elements incorporating LPE YIG films and polycrystalline YIG slabs with an ultrathin Pt layer

Cited by 8 publications

References 19 publications

Spin‐Thermoelectric Generation of Insulator‐Based Generators Incorporating a Single‐Crystal Yttrium Iron Garnet Film in Relation to Domain Magnetization Processes

Spin‐Thermoelectric Generation of Insulator‐Based Generators Incorporating a Single‐Crystal Yttrium Iron Garnet Film in Relation to Domain Magnetization Processes

Spin‐Thermoelectric Generation Associated with Magnetization Dynamics in the Insulator‐Based Generators Fabricated from Liquid Phase Epitaxial Yttrium Iron Garnet, Bi‐Substituted YIG and Bi‐ and Al‐Substituted YIG Films

Characteristics of spin-thermoelectric generators enhanced by incorporating liquid phase epitaxial Bi-substituted YIG films as a ferrimagnetic insulator

Contact Info

Product

Resources

About