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Journal Articles

Neutron imaging of generated water inside polymer electrolyte fuel cell using newly-developed gas diffusion layer with gas flow channels during power generation

Nasu, Mitsunori*; Yanai, Hiroshi*; Hirayama, Naoki*; Adachi, Hironori*; Kakizawa, Yu*; Shirase, Yuto*; Nishiyama, Hiromichi*; Kawamoto, Teppei*; Inukai, Junji*; Shinohara, Takenao; et al.

Journal of Power Sources, 530, p.231251_1 - 231251_11, 2022/05

 Times Cited Count:9 Percentile:86.76(Chemistry, Physical)

Journal Articles

Thermoelectric generation based on spin Seebeck effects

Uchida, Kenichi*; Adachi, Hiroto; Kikkawa, Takashi*; Kirihara, Akihiro*; Ishida, Masahiko*; Yorozu, Shinichi*; Maekawa, Sadamichi; Saito, Eiji*

Proceedings of the IEEE, 104(10), p.1946 - 1973, 2016/10

 Times Cited Count:205 Percentile:99.23(Engineering, Electrical & Electronic)

Journal Articles

Origin of the spin Seebeck effect in compensated ferrimagnets

Gepr$"a$gs, S.*; Kehlberger, A.*; Coletta, F.*; Qiu, Z.*; Guo, E.-J.*; Schulz, T.*; Mix, C.*; Meyer, S.*; Kamra, A.*; Althammer, M.*; et al.

Nature Communications (Internet), 7, p.10452_1 - 10452_6, 2016/02

 Times Cited Count:137 Percentile:97.22(Multidisciplinary Sciences)

Journal Articles

Unconventional scaling and significant enhancement of the spin Seebeck effect in multilayers

Ramos, R.*; Kikkawa, Takashi*; Aguirre, M.*; Lucas, I.*; Anad$'o$n, A.*; Oyake, Takafumi*; Uchida, Kenichi*; Adachi, Hiroto; Shiomi, Junichiro*; Algarabel, P. A.*; et al.

Physical Review B, 92(22), p.220407_1 - 220407_5, 2015/12

 Times Cited Count:65 Percentile:90.77(Materials Science, Multidisciplinary)

Journal Articles

Magnon instability driven by heat current in magnetic bilayers

Onuma, Yuichi*; Adachi, Hiroto; Saito, Eiji; Maekawa, Sadamichi

Physical Review B, 92(22), p.224404_1 - 224404_8, 2015/12

 Times Cited Count:8 Percentile:36.79(Materials Science, Multidisciplinary)

Journal Articles

Thermal effects in Spintronics; Physics and applications

Adachi, Hiroto; Maekawa, Sadamichi

Handbook of Spintronics, p.1553 - 1576, 2015/09

Journal Articles

Theory of unidirectional spin heat conveyer

Adachi, Hiroto; Maekawa, Sadamichi

Journal of Applied Physics, 117(17), p.17C710_1 - 17C710_4, 2015/05

 Times Cited Count:6 Percentile:28.05(Physics, Applied)

We theoretically investigate the unidirectional spin heat conveyer effect recently reported in the literature that emerges from the Damon-Eshbach spin wave on the surface of a magnetic material. We develop a simple phenomenological approach to heat transfer dynamics in a coupled system of phonons and the Damon-Eshbach spin wave, and demonstrate that there arises a direction-selective heat flow as a result of the competition between an isotropic heat diffusion by phonons and unidirectional heat drift by the spin wave. The phenomenological approach can account for the asymmetric local temperature distribution observed in the experiment.

Journal Articles

Generation of spin currents by surface plasmon resonance

Uchida, Kenichi*; Adachi, Hiroto; Kikuchi, Daisuke*; Ito, Shun*; Qiu, Z.*; Maekawa, Sadamichi; Saito, Eiji

Nature Communications (Internet), 6, p.5910_1 - 5910_8, 2015/01

 Times Cited Count:46 Percentile:85.79(Multidisciplinary Sciences)

Journal Articles

Theory of the acoustic spin pumping

Adachi, Hiroto; Maekawa, Sadamichi

Solid State Communications, 198, p.22 - 25, 2014/11

 Times Cited Count:6 Percentile:28.97(Physics, Condensed Matter)

Spin pumping refers to the spin current injection driven by magnetization dynamics from a ferromagnet into adjacent nonmagnetic conductors. Conventionally, ferromagnetic resonance is used to drive the magnetization dynamics and the spin pumping. Recently a new type of spin pumping driven by acoustic waves, i.e., the acoustic spin pumping, has been reported. We present a linear-response theory of the acoustic spin pumping.

Journal Articles

Enhanced dc spin pumping into a fluctuating ferromagnet near Tc

Onuma, Yuichi*; Adachi, Hiroto; Saito, Eiji; Maekawa, Sadamichi

Physical Review B, 89(17), p.174417_1 - 174417_10, 2014/05

 Times Cited Count:91 Percentile:94.36(Materials Science, Multidisciplinary)

Journal Articles

Thermal engineering of non-local resistance in lateral spin valves

Kasai, Shinya*; Hirayama, Yusuke*; Takahashi, Yukiko*; Mitani, Seiji*; Hono, Kazuhiro*; Adachi, Hiroto; Ieda, Junichi; Maekawa, Sadamichi

Applied Physics Letters, 104(16), p.162410_1 - 162410_4, 2014/04

 Times Cited Count:14 Percentile:53.45(Physics, Applied)

Journal Articles

Separation of longitudinal spin Seebeck effect from anomalous Nernst effect; Determination of origin of transverse thermoelectric voltage in metal/insulator junctions

Kikkawa, Takashi*; Uchida, Kenichi*; Daimon, Shunsuke*; Shiomi, Yuki*; Adachi, Hiroto; Qiu, Z.*; Hou, D.*; Jin, X.-F.*; Maekawa, Sadamichi; Saito, Eiji

Physical Review B, 88(21), p.214403_1 - 214403_11, 2013/12

 Times Cited Count:120 Percentile:96.28(Materials Science, Multidisciplinary)

Journal Articles

Spin-wave spin current in magnetic insulators

Uchida, Kenichi*; Adachi, Hiroto; Kajiwara, Yosuke*; Maekawa, Sadamichi; Saito, Eiji

Solid State Physics, 64; Recent Advances in Magnetic Insulators; From Spintronics to Microwave Applications, p.1 - 27, 2013/11

 Times Cited Count:11 Percentile:16.28(Physics, Condensed Matter)

Journal Articles

Spin current; Experimental and theoretical aspects

Maekawa, Sadamichi; Adachi, Hiroto; Uchida, Kenichi*; Ieda, Junichi; Saito, Eiji

Journal of the Physical Society of Japan, 82(10), p.102002_1 - 102002_23, 2013/10

 Times Cited Count:84 Percentile:79.19(Physics, Multidisciplinary)

Journal Articles

Linear-response theory of the longitudinal spin Seebeck effect

Adachi, Hiroto; Maekawa, Sadamichi

Journal of the Korean Physical Society, 62(12), p.1753 - 1758, 2013/06

 Times Cited Count:12 Percentile:61.18(Physics, Multidisciplinary)

Journal Articles

Heat and spin

Maekawa, Sadamichi; Adachi, Hiroto

Journal of the Korean Physical Society, 62(12), p.1985 - 1989, 2013/06

 Times Cited Count:0 Percentile:0(Physics, Multidisciplinary)

Journal Articles

Unidirectional spin-wave heat conveyer

An, Toshu*; Vasyuchka, V. I.*; Uchida, Kenichi*; Chumak, A. V.*; Yamaguchi, Kazuya*; Harii, Kazuya; Oe, Junichiro*; Jungfleisch, M. B.*; Kajiwara, Yosuke*; Adachi, Hiroto; et al.

Nature Materials, 12(6), p.549 - 553, 2013/06

 Times Cited Count:122 Percentile:96.28(Chemistry, Physical)

Journal Articles

Theory of the spin Seebeck effect

Adachi, Hiroto; Uchida, Kenichi*; Saito, Eiji; Maekawa, Sadamichi

Reports on Progress in Physics, 76(3), p.036501_1 - 036501_20, 2013/03

 Times Cited Count:336 Percentile:96.24(Physics, Multidisciplinary)

The spin Seebeck effect refers to the generation of a spin voltage caused by a temperature gradient in a ferromagnet, which enables the thermal injection of spin currents from the ferromagnet into an attached nonmagnetic metal over a macroscopic scale of several millimeters. The inverse spin Hall effect converts the injected spin current into a transverse charge voltage, thereby producing electromotive force as in the conventional charge Seebeck device. Recent theoretical and experimental efforts have shown that the magnon and phonon degrees of freedom play crucial roles in the spin Seebeck effect. In this paper, we present the theoretical basis for understanding the spin Seebeck effect and briefly discuss other thermal spin effects.

Journal Articles

Observation of the spin Seebeck effect in epitaxial Fe$$_{3}$$O$$_{4}$$ thin films

Ramos, R.*; Kikkawa, Takashi*; Uchida, Kenichi*; Adachi, Hiroto; Lucas, I.*; Aguirre, M.*; Algarabel, P.*; Morell$'o$n, L.*; Maekawa, Sadamichi; Saito, Eiji; et al.

Applied Physics Letters, 102(7), p.072413_1 - 072413_5, 2013/02

 Times Cited Count:147 Percentile:97.22(Physics, Applied)

Journal Articles

Spin Seebeck effect in antiferromagnets and compensated ferrimagnets

Onuma, Yuichi; Adachi, Hiroto; Saito, Eiji; Maekawa, Sadamichi

Physical Review B, 87(1), p.014423_1 - 014423_7, 2013/01

 Times Cited Count:113 Percentile:95.95(Materials Science, Multidisciplinary)

60 (Records 1-20 displayed on this page)