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  1. Article ; Online: Observation of Omnidirectional Exchange Bias at All-Antiferromagnetic Polycrystalline Heterointerface.

    Asakura, Mihiro / Higo, Tomoya / Matsuo, Takumi / Uesugi, Ryota / Nishio-Hamane, Daisuke / Nakatsuji, Satoru

    Advanced materials (Deerfield Beach, Fla.)

    2024  , Page(s) e2400301

    Abstract: Due to promising functionalities that may dramatically enhance spintronics performance, antiferromagnets are the subject of intensive research for developing the next-generation active elements to replace ferromagnets. In particular, the recent ... ...

    Abstract Due to promising functionalities that may dramatically enhance spintronics performance, antiferromagnets are the subject of intensive research for developing the next-generation active elements to replace ferromagnets. In particular, the recent experimental demonstration of tunneling magnetoresistance and electrical switching using chiral antiferromagnets has sparked expectations for the practical integration of antiferromagnetic materials into device architectures. To further develop the technology to manipulate the magnetic anisotropies in all-antiferromagnetic devices, it is essential to realize exchange bias through the interface between antiferromagnetic multilayers. Here, the first observation on the omnidirectional exchange bias at an all-antiferromagnetic polycrystalline heterointerface is reported. This experiment demonstrates that the interfacial energy causing the exchange bias between the chiral-antiferromagnet Mn
    Language English
    Publishing date 2024-03-26
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.202400301
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Roll-to-Roll Printing of Anomalous Nernst Thermopile for Direct Sensing of Perpendicular Heat Flux.

    Tanaka, Hirokazu / Higo, Tomoya / Uesugi, Ryota / Yamagata, Kazuto / Nakanishi, Yosuke / Machinaga, Hironobu / Nakatsuji, Satoru

    Advanced materials (Deerfield Beach, Fla.)

    2023  Volume 35, Issue 38, Page(s) e2303416

    Abstract: The anomalous Nernst effect (ANE) converts heat flux perpendicular to the plane into electricity, in sharp contrast with the Seebeck effect (SE), enabling mass production, large area, and flexibility of their devices through ordinary thin-film ... ...

    Abstract The anomalous Nernst effect (ANE) converts heat flux perpendicular to the plane into electricity, in sharp contrast with the Seebeck effect (SE), enabling mass production, large area, and flexibility of their devices through ordinary thin-film fabrication techniques. Heat flux sensors, one of the most promising applications of ANE, are powerful devices for evaluating heat flow and can lead to energy savings through efficient thermal management. In reality, however, SE caused by the in-plane heat flux is always superimposed on the measurement signal, making it difficult to evaluate the perpendicular heat flux. Here, ANE-type heat flux sensors that selectively detect a perpendicular heat flux are fabricated by adjusting the net Seebeck coefficient in their thermopile circuit with mass-producible roll-to-roll sputtering methods. The direct sensing of perpendicular heat flux using ANE-based flexible thermopiles, as well as their simple fabrication process, paves the way for the practical application of thin-film thermoelectric devices.
    Language English
    Publishing date 2023-07-24
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.202303416
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Room-temperature terahertz anomalous Hall effect in Weyl antiferromagnet Mn

    Matsuda, Takuya / Kanda, Natsuki / Higo, Tomoya / Armitage, N P / Nakatsuji, Satoru / Matsunaga, Ryusuke

    Nature communications

    2020  Volume 11, Issue 1, Page(s) 909

    Abstract: Antiferromagnetic spin motion at terahertz (THz) frequencies attracts growing interests for fast spintronics, however, their smaller responses to external field inhibit device application. Recently the noncollinear antiferromagnet ... ...

    Abstract Antiferromagnetic spin motion at terahertz (THz) frequencies attracts growing interests for fast spintronics, however, their smaller responses to external field inhibit device application. Recently the noncollinear antiferromagnet Mn
    Language English
    Publishing date 2020-02-14
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-020-14690-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Ultrafast Dynamics of Intrinsic Anomalous Hall Effect in the Topological Antiferromagnet Mn_{3}Sn.

    Matsuda, Takuya / Higo, Tomoya / Koretsune, Takashi / Kanda, Natsuki / Hirai, Yoshua / Peng, Hanyi / Matsuo, Takumi / Yoshikawa, Naotaka / Shimano, Ryo / Nakatsuji, Satoru / Matsunaga, Ryusuke

    Physical review letters

    2023  Volume 130, Issue 12, Page(s) 126302

    Abstract: We investigate ultrafast dynamics of the anomalous Hall effect (AHE) in the topological antiferromagnet Mn_{3}Sn with sub-100 fs time resolution. Optical pulse excitations largely elevate the electron temperature up to 700 K, and terahertz probe pulses ... ...

    Abstract We investigate ultrafast dynamics of the anomalous Hall effect (AHE) in the topological antiferromagnet Mn_{3}Sn with sub-100 fs time resolution. Optical pulse excitations largely elevate the electron temperature up to 700 K, and terahertz probe pulses clearly resolve ultrafast suppression of the AHE before demagnetization. The result is well reproduced by microscopic calculation of the intrinsic Berry-curvature mechanism while the extrinsic contribution is clearly excluded. Our work opens a new avenue for the study of nonequilibrium AHE to identify the microscopic origin by drastic control of the electron temperature by light.
    Language English
    Publishing date 2023-04-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.130.126302
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Octupole-driven magnetoresistance in an antiferromagnetic tunnel junction.

    Chen, Xianzhe / Higo, Tomoya / Tanaka, Katsuhiro / Nomoto, Takuya / Tsai, Hanshen / Idzuchi, Hiroshi / Shiga, Masanobu / Sakamoto, Shoya / Ando, Ryoya / Kosaki, Hidetoshi / Matsuo, Takumi / Nishio-Hamane, Daisuke / Arita, Ryotaro / Miwa, Shinji / Nakatsuji, Satoru

    Nature

    2023  Volume 613, Issue 7944, Page(s) 490–495

    Abstract: The tunnelling electric current passing through a magnetic tunnel junction (MTJ) is strongly dependent on the relative orientation of magnetizations in ferromagnetic electrodes sandwiching an insulating barrier, rendering efficient readout of spintronics ...

    Abstract The tunnelling electric current passing through a magnetic tunnel junction (MTJ) is strongly dependent on the relative orientation of magnetizations in ferromagnetic electrodes sandwiching an insulating barrier, rendering efficient readout of spintronics devices
    Language English
    Publishing date 2023-01-18
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-022-05463-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.A 26: Show issues Location:
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  6. Article ; Online: Giant field-like torque by the out-of-plane magnetic spin Hall effect in a topological antiferromagnet.

    Kondou, Kouta / Chen, Hua / Tomita, Takahiro / Ikhlas, Muhammad / Higo, Tomoya / MacDonald, Allan H / Nakatsuji, Satoru / Otani, YoshiChika

    Nature communications

    2021  Volume 12, Issue 1, Page(s) 6491

    Abstract: Spin-orbit torques (SOT) enable efficient electrical control of the magnetic state of ferromagnets, ferrimagnets and antiferromagnets. However, the conventional SOT has severe limitation that only in-plane spins accumulate near the surface, whether ... ...

    Abstract Spin-orbit torques (SOT) enable efficient electrical control of the magnetic state of ferromagnets, ferrimagnets and antiferromagnets. However, the conventional SOT has severe limitation that only in-plane spins accumulate near the surface, whether interpreted as a spin Hall effect (SHE) or as an Edelstein effect. Such a SOT is not suitable for controlling perpendicular magnetization, which would be more beneficial for realizing low-power-consumption memory devices. Here we report the observation of a giant magnetic-field-like SOT in a topological antiferromagnet Mn
    Language English
    Publishing date 2021-11-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-021-26453-y
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  7. Article ; Online: Perpendicular full switching of chiral antiferromagnetic order by current.

    Higo, Tomoya / Kondou, Kouta / Nomoto, Takuya / Shiga, Masanobu / Sakamoto, Shoya / Chen, Xianzhe / Nishio-Hamane, Daisuke / Arita, Ryotaro / Otani, Yoshichika / Miwa, Shinji / Nakatsuji, Satoru

    Nature

    2022  Volume 607, Issue 7919, Page(s) 474–479

    Abstract: Electrical control of a magnetic state of matter lays the foundation for information technologies and for understanding of spintronic phenomena. Spin-orbit torque provides an efficient mechanism for the electrical manipulation of magnetic ... ...

    Abstract Electrical control of a magnetic state of matter lays the foundation for information technologies and for understanding of spintronic phenomena. Spin-orbit torque provides an efficient mechanism for the electrical manipulation of magnetic orders
    Language English
    Publishing date 2022-07-20
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-022-04864-1
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    Zs.A 26: Show issues Location:
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  8. Article ; Online: Large anomalous Hall effect in a non-collinear antiferromagnet at room temperature.

    Nakatsuji, Satoru / Kiyohara, Naoki / Higo, Tomoya

    Nature

    2015  Volume 527, Issue 7577, Page(s) 212–215

    Abstract: In ferromagnetic conductors, an electric current may induce a transverse voltage drop in zero applied magnetic field: this anomalous Hall effect is observed to be proportional to magnetization, and thus is not usually seen in antiferromagnets in zero ... ...

    Abstract In ferromagnetic conductors, an electric current may induce a transverse voltage drop in zero applied magnetic field: this anomalous Hall effect is observed to be proportional to magnetization, and thus is not usually seen in antiferromagnets in zero field. Recent developments in theory and experiment have provided a framework for understanding the anomalous Hall effect using Berry-phase concepts, and this perspective has led to predictions that, under certain conditions, a large anomalous Hall effect may appear in spin liquids and antiferromagnets without net spin magnetization. Although such a spontaneous Hall effect has now been observed in a spin liquid state, a zero-field anomalous Hall effect has hitherto not been reported for antiferromagnets. Here we report empirical evidence for a large anomalous Hall effect in an antiferromagnet that has vanishingly small magnetization. In particular, we find that Mn3Sn, an antiferromagnet that has a non-collinear 120-degree spin order, exhibits a large anomalous Hall conductivity of around 20 per ohm per centimetre at room temperature and more than 100 per ohm per centimetre at low temperatures, reaching the same order of magnitude as in ferromagnetic metals. Notably, the chiral antiferromagnetic state has a very weak and soft ferromagnetic moment of about 0.002 Bohr magnetons per Mn atom (refs 10, 12), allowing us to switch the sign of the Hall effect with a small magnetic field of around a few hundred oersted. This soft response of the large anomalous Hall effect could be useful for various applications including spintronics--for example, to develop a memory device that produces almost no perturbing stray fields.
    Language English
    Publishing date 2015-11-12
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/nature15723
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    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
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  9. Article ; Online: Impact of the Lattice on Magnetic Properties and Possible Spin Nematicity in the S=1 Triangular Antiferromagnet NiGa_{2}S_{4}.

    Valentine, Michael E / Higo, Tomoya / Nambu, Yusuke / Chaudhuri, Dipanjan / Wen, Jiajia / Broholm, Collin / Nakatsuji, Satoru / Drichko, Natalia

    Physical review letters

    2020  Volume 125, Issue 19, Page(s) 197201

    Abstract: NiGa_{2}S_{4} is a triangular lattice S=1 system with strong two dimensionality of the lattice, actively discussed as a candidate to host spin-nematic order brought about by strong quadrupole coupling. Using Raman scattering spectroscopy we identify a ... ...

    Abstract NiGa_{2}S_{4} is a triangular lattice S=1 system with strong two dimensionality of the lattice, actively discussed as a candidate to host spin-nematic order brought about by strong quadrupole coupling. Using Raman scattering spectroscopy we identify a phonon of E_{g} symmetry which can modulate magnetic exchange J_{1} and produce quadrupole coupling. Additionally, our Raman scattering results demonstrate a loss of local inversion symmetry on cooling, which we associate with sulfur vacancies. This will lead to disordered Dzyaloshinskii-Moriya interactions, which can prevent long-range magnetic order. Using magnetic Raman scattering response we identify 160 K as a temperature of an upturn of magnetic correlations. The temperature range below 160 K, but above 50 K where antiferromagnetic correlations start to increase, is a candidate for spin-nematic regime.
    Language English
    Publishing date 2020-11-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.125.197201
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  10. Book ; Online: Room-Temperature Terahertz Anomalous Hall Effect in Weyl Antiferromagnet Mn$_3$Sn Thin Films

    Matsuda, Takuya / Kanda, Natsuki / Higo, Tomoya / Armitage, N. P. / Nakatsuji, Satoru / Matsunaga, Ryusuke

    2019  

    Abstract: Antiferromagnetic spin motion at terahertz (THz) frequencies attracts growing interests for fast spintronics, however their smaller responses to external field inhibit device application. Recently the noncollinear antiferromagnet Mn$_3$Sn, a Weyl ... ...

    Abstract Antiferromagnetic spin motion at terahertz (THz) frequencies attracts growing interests for fast spintronics, however their smaller responses to external field inhibit device application. Recently the noncollinear antiferromagnet Mn$_3$Sn, a Weyl semimetal candidate, was reported to show large anomalous Hall effect (AHE) at room temperature comparable to ferromagnets. Dynamical aspect of such large responses is an important issue to be clarified for future THz data processing. Here the THz anomalous Hall conductivity in Mn$_3$Sn thin films is investigated by polarization-resolved spectroscopy. Large anomalous Hall conductivity Re $\sigma_{xy} (\omega) \sim$ 20 $\rm{\Omega^{-1} cm^{-1}}$ at THz frequencies is clearly observed as polarization rotation. In contrast, Im $\sigma_{xy} (\omega)$ is small up to a few THz, showing that the AHE remains dissipationless over a large frequency range. A peculiar temperature dependence corresponding to the breaking/recovery of symmetry in the spin texture is also discussed. Observation of the THz AHE at room temperature demonstrates the ultrafast readout for the antiferromagnetic spintronics using Mn$_3$Sn and will also open new avenue for studying nonequilibrium dynamics in Weyl antiferromagnets.
    Keywords Condensed Matter - Materials Science
    Subject code 541
    Publishing date 2019-12-29
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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