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  1. Article ; Online: Scalable spin Seebeck thermoelectric generation using Fe-oxide nanoparticle assembled film on flexible substrate.

    Kurokawa, Yuichiro / Tahara, Yusuke / Hamada, Yuki / Fujimoto, Masahiro / Yuasa, Hiromi

    Scientific reports

    2022  Volume 12, Issue 1, Page(s) 16605

    Abstract: We fabricated ... ...

    Abstract We fabricated Fe
    Language English
    Publishing date 2022-10-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-21200-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Online: Coexistence of large anomalous Nernst effect and large coercive force in amorphous ferrimagnetic TbCo alloy films

    Odagiri, Miho / Imaeda, Hiroto / Yagmur, Ahmet / Kurokawa, Yuichiro / Sumi, Satoshi / Awano, Hiroyuki / Tanabe, Kenji

    2024  

    Abstract: The Anomalous Nernst Effect (ANE) has garnered significant interest for practical applications, particularly in energy harvesting and heat flux sensing. For these applications, it is crucial for the module to operate without an external magnetic field, ... ...

    Abstract The Anomalous Nernst Effect (ANE) has garnered significant interest for practical applications, particularly in energy harvesting and heat flux sensing. For these applications, it is crucial for the module to operate without an external magnetic field, necessitating a combination of a large ANE and a substantial coercive force. However, most materials exhibiting a large ANE typically have a relatively small coercive force. In our research, we have explored the ANE in amorphous ferrimagnetic TbCo alloy films, noting that the coercive force peaks at the magnetization compensation point (MCP). We observed that transverse Seebeck coefficients are amplified with Tb doping, reaching more than 1.0 uV/K over a wide composition range near the MCP, which is three times greater than that of pure Co. Our findings indicate that this enhancement is primarily due to direct conversion, a product of the transverse thermoelectric component and electrical resistivity. TbCo films present several significant advantages for practical use: a large ANE, the capability to exhibit both positive and negative ANE, the flexibility to be deposited on any substrate due to their amorphous nature, a low thermal conductivity, and a large coercive force. These attributes make TbCo films a promising material for advancing ANE-based technologies.
    Keywords Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Materials Science
    Subject code 621
    Publishing date 2024-01-09
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Ultra-wide-band millimeter-wave generator using spin torque oscillator with strong interlayer exchange couplings.

    Kurokawa, Yuichiro / Yamada, Keisuke / Taniguchi, Tomohiro / Horiike, Shu / Tanaka, Terumitsu / Yuasa, Hiromi

    Scientific reports

    2022  Volume 12, Issue 1, Page(s) 10849

    Abstract: Recent increased development interest in millimeter-wave oscillator devices has necessitated realization of small oscillators with high frequency, wide frequency tunability, and room-temperature operation. Spin-torque oscillators (STOs) are fascinating ... ...

    Abstract Recent increased development interest in millimeter-wave oscillator devices has necessitated realization of small oscillators with high frequency, wide frequency tunability, and room-temperature operation. Spin-torque oscillators (STOs) are fascinating candidates for such applications because of their nanometer size and suitability for room-temperature operation. However, their oscillation frequency and tunable range are limited to the order of 100 MHz-10 GHz. Here, we propose use of bilinear (J
    Language English
    Publishing date 2022-07-19
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-15014-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: Large anomalous Nernst effect in non-crystalline Gd-Fe ferrimagnetic alloy films for flexible thermoelectric applications

    Kurokawa, Yuichiro / Fujimoto, Masahiro / Hamada, Yuki / Yuasa, Hiromi

    2021  

    Abstract: The anomalous Nernst effect (ANE), a heat-charge conversion mechanism based on a magnetic metal, has been extensively studied for application in thin thermoelectric devices. The low magnetization and fabrication at room temperature are important for ... ...

    Abstract The anomalous Nernst effect (ANE), a heat-charge conversion mechanism based on a magnetic metal, has been extensively studied for application in thin thermoelectric devices. The low magnetization and fabrication at room temperature are important for flexible ANE thermoelectric devices on plastic substrates. Therefore, we investigated the ANE in ferrimagnetic GdxFe100-x films with low magnetization in this study by systematically varying the Gd composition x. Although the Gd33Fe67 film with a Gd composition close to magnetic compensation composition exhibited very low magnetization, an ANE coefficient |S_ANE| of 2.13 uV/K was obtained, which is close to the highest value reported thus far. Finally, we demonstrated the ANE in a Gd33Fe67 film deposited on a flexible sheet. A sufficient ANE voltage was obtained while maintaining the flexibility of the sample, indicating the potential application of this material in thermoelectric devices exploiting the ANE of Gd-Fe films.

    Comment: 25 pages, 8 figures
    Keywords Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2021-07-12
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  5. Book ; Online: Interfacial Dzyaloshinskii-Moriya interaction and chiral magnetic textures in a ferrimagnetic insulator

    Ding, Shilei / Ross, Andrew / Lebrun, Romain / Becker, Sven / Lee, Kyujoon / Boventer, Isabella / Das, Souvik / Kurokawa, Yuichiro / Gupta, Shruti / Yang, Jinbo / Jakob, Gerhard / Kläui, Mathias

    2019  

    Abstract: The interfacial Dzyaloshinskii-Moriya interaction (DMI) in multilayers of heavy metal and ferromagnetic metals enables the stabilization of novel chiral spin structures such as skyrmions. Magnetic insulators, on the other hand can exhibit enhanced ... ...

    Abstract The interfacial Dzyaloshinskii-Moriya interaction (DMI) in multilayers of heavy metal and ferromagnetic metals enables the stabilization of novel chiral spin structures such as skyrmions. Magnetic insulators, on the other hand can exhibit enhanced dynamics and properties such as lower magnetic damping and therefore it is of interest to combine the properties enabled by interfacial DMI with insulating systems. Here, we demonstrate the presence of interfacial DMI in heterostructures that include insulating magnetic layers. We use a bilayer of perpendicularly magnetized insulating thulium iron garnet (TmIG) and the heavy metal platinum, and find a surprisingly strong interfacial DMI that, combined with spin-orbit torque results, in efficient switching. The interfacial origin is confirmed through thickness dependence measurements of the DMI, revealing the characteristic 1/thickness dependence with one order of magnitude longer decay length compared to metallic layers. We combine chiral spin structures and spin-orbit torques for efficient switching and identify skyrmions that allow us to establish the GGG/TmIG interface as the origin of the DMI.
    Keywords Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2019-06-17
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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