Measurement of the heat flux normalized spin Seebeck coefficient of thin films as a function of temperature

Venkat, Guru; Cox, Chris D.; Sola, Alessandro; Basso, Vittorio; Morrison, Kelly

doi:10.1063/5.0007989

Cited by 4 publications

(1 citation statement)

References 27 publications

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“…However, the estimation of , which is used to determine S SSE , is complicated because the Fe 3 O 4 NP layer is much thinner than the substrate material. There are several methods to estimate a sample independent of the spin Seebeck coefficient without determining the of the thin magnetic layer; for example, the heat flux normalized spin Seebeck coefficient 46 . In this study, to estimate S SSE , we calculated a temperature gradient for Fe 3 O 4 NP-assembled film using the following equation 47 : where and are the thermal conductivity of polyimide and Fe 3 O 4 NP-assembled films, respectively.…”

Section: Resultsmentioning

confidence: 99%

Scalable spin Seebeck thermoelectric generation using Fe-oxide nanoparticle assembled film on flexible substrate

Kurokawa

Tahara

Hamada

et al. 2022

Sci Rep

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We fabricated Fe3O4 nanoparticle (NP)-assembled films on flexible polyimide sheets with Pt or Ta cap layer using a spin coating method and DC sputtering. The films were elaborated for spin Seebeck thermoelectric generator applications, and their spin Seebeck voltages were observed. We showed that the thermoelectric power of [Pt film/Fe3O4 NP]n multilayered films increases with increasing number of stacking n. Additionally, we prepared spin Seebeck thermopile devices in which the Fe3O4 NP-assembled films capped by Pt and Ta are connected alternately in series. We demonstrated that spin Seebeck voltages of the thermopile devices are larger than those of single [Pt or Ta film/Fe3O4 NP]n piece. Our results indicate that the spin Seebeck thermoelectric power of Fe3O4 NPs can be enhanced using a simple fabrication process without lithography technique.

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Section: Resultsmentioning

confidence: 99%

Scalable spin Seebeck thermoelectric generation using Fe-oxide nanoparticle assembled film on flexible substrate

Kurokawa

Tahara

Hamada

et al. 2022

Sci Rep

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Spin and spin current—From fundamentals to recent progress

Maekawa

Kikkawa

Chudo

et al. 2023

Journal of Applied Physics

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Along with the progress of spin science and spintronics research, the flow of electron spins, i.e., spin current, has attracted interest. New phenomena and electronic states were explained in succession using the concept of spin current. Moreover, as many of the conventionally known spintronics phenomena became well organized based on spin current, it has rapidly been recognized as an essential concept in a wide range of condensed matter physics. In this article, we focus on recent developments in the physics of spin, spin current, and their related phenomena, where the conversion between spin angular momentum and different forms of angular momentum plays an essential role. Starting with an introduction to spin current, we first discuss the recent progress in spintronic phenomena driven by spin-exchange coupling: spin pumping, topological Hall torque, and emergent inductor. We, then, extend our discussion to the interaction/interconversion of spins with heat, lattice vibrations, and charge current and address recent progress and perspectives on the spin Seebeck and Peltier effects. Next, we review the interaction between mechanical motion and electron/nuclear spins and argue the difference between the Barnett field and rotational Doppler effect. We show that the Barnett effect reveals the angular momentum compensation temperature, at which the net angular momentum is quenched in ferrimagnets.

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Polycrystalline MnBi as a transverse thermoelectric material

et al. 2023

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To assess the potential of polycrystalline MnBi as a transverse thermoelectric material, we have experimentally investigated its anomalous Nernst effect (ANE) by means of the heat flux method. We prepared MnBi samples by powder metallurgy; this technique allows the preparation of samples in arbitrary shapes with the possibility to tailor their magnetic properties. In the material exhibiting the highest remanent magnetization, we found a value of the ANE thermopower of −1.1 μV/K at 1 T, after the compensation of the ordinary Nernst effect from pure bismuth present inside the polycrystalline sample. This value is comparable with those reported in the literature for single crystals.

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Measurement of the heat flux normalized spin Seebeck coefficient of thin films as a function of temperature

Abstract: New algorithm using L1 regularization for measuring electron energy spectra Review of Scientific Instruments 91, 075116 (2020);

Cited by 4 publications

References 27 publications

Scalable spin Seebeck thermoelectric generation using Fe-oxide nanoparticle assembled film on flexible substrate

Scalable spin Seebeck thermoelectric generation using Fe-oxide nanoparticle assembled film on flexible substrate

Spin and spin current—From fundamentals to recent progress

Polycrystalline MnBi as a transverse thermoelectric material

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