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Oyanagi, Koichi*; Takahashi, Saburo*; Kikkawa, Takashi*; Saito, Eiji
Physical Review B, 107(1), p.014423_1 - 014423_8, 2023/01
Times Cited Count：10 Percentile：85.88(Materials Science, Multidisciplinary)Kikkawa, Takashi*; Reitz, D.*; Ito, Hiroaki*; Makiuchi, Takahiko*; Sugimoto, Takaaki*; Tsunekawa, Kakeru*; Daimon, Shunsuke*; Oyanagi, Koichi*; Ramos, R.*; Takahashi, Saburo*; et al.
Nature Communications (Internet), 12, p.4356_1 - 4356_7, 2021/07
Times Cited Count：19 Percentile：82.93(Multidisciplinary Sciences)Oyanagi, Koichi*; Takahashi, Saburo*; Cornelissen, L. J.*; Shan, J.*; Daimon, Shunsuke*; Kikkawa, Takashi*; Bauer, G. E. W.*; Van Wees, B. J.*; Saito, Eiji
Nature Communications (Internet), 10, p.4740_1 - 4740_6, 2019/10
Times Cited Count：46 Percentile：89.71(Multidisciplinary Sciences)Kameda, Mai*; Hirobe, Daichi*; Daimon, Shunsuke*; Shiomi, Yuki*; Takahashi, Saburo*; Saito, Eiji
Journal of Magnetism and Magnetic Materials, 476, p.459 - 463, 2019/04
Times Cited Count：1 Percentile：4.14(Materials Science, Multidisciplinary)Lustikova, J.*; Shiomi, Yuki*; Yokoi, Naoto*; Kabeya, Noriyuki*; Kimura, Noriaki*; Ienaga, Koichiro*; Kaneko, Shinichi*; Okuma, Satoshi*; Takahashi, Saburo*; Saito, Eiji
Nature Communications (Internet), 9, p.4922_1 - 4922_6, 2018/11
Times Cited Count：38 Percentile：86.41(Multidisciplinary Sciences)Shiomi, Yuki*; Lustikova, J.*; Watanabe, Shingo*; Hirobe, Daichi*; Takahashi, Saburo*; Saito, Eiji
Nature Physics, 15(1), p.22 - 26, 2018/10
Times Cited Count：20 Percentile：76.34(Physics, Multidisciplinary)Gu, B.; Takahashi, Saburo*; Maekawa, Sadamichi
Physical Review B, 96(21), p.214423_1 - 214423_6, 2017/12
Times Cited Count：9 Percentile：40.37(Materials Science, Multidisciplinary)Watanabe, Shingo*; Hirobe, Daichi*; Shiomi, Yuki*; Iguchi, Ryo*; Daimon, Shunsuke*; Kameda, Mai*; Takahashi, Saburo*; Saito, Eiji
Scientific Reports (Internet), 7, p.4576_1 - 4576_6, 2017/07
Times Cited Count：6 Percentile：27.46(Multidisciplinary Sciences)Kobayashi, Nobukiyo*; Masumoto, Hiroshi*; Takahashi, Saburo*; Maekawa, Sadamichi
Scientific Reports (Internet), 6, p.34227_1 - 34227_7, 2016/09
Times Cited Count：34 Percentile：76.19(Multidisciplinary Sciences)Chen, Y.-T.*; Takahashi, Saburo*; Nakayama, Hiroyasu*; Althammer, M.*; Goennenwein, S. T. B.*; Saito, Eiji; Bauer, G. E. W.*
Journal of Physics; Condensed Matter, 28(10), p.103004_1 - 103004_15, 2016/03
Times Cited Count：89 Percentile：62.10(Physics, Condensed Matter)We review the so-called spin Hall magnetoresistance (SMR) in bilayers of a magnetic insulator and a metal, in which spin currents are generated in the normal metal by the spin Hall effect. The associated angular momentum transfer to the ferromagnetic layer and thereby the electrical resistance is modulated by the angle between the applied current and the magnetization direction. The SMR provides a convenient tool to non-invasively measure the magnetization direction and spin-transfer torque to an insulator. We introduce the minimal theoretical instruments to calculate the SMR, i.e. spin diffusion theory and quantum mechanical boundary conditions. This leads to a small set of parameters that can be fitted to experiments. We discuss the limitations of the theory as well as alternative mechanisms such as the ferromagnetic proximity effect and Rashba spin-orbit torques, and point out new developments.
Takahashi, Ryo*; Matsuo, Mamoru; Ono, Masao; Harii, Kazuya; Chudo, Hiroyuki; Okayasu, Satoru; Ieda, Junichi; Takahashi, Saburo*; Maekawa, Sadamichi; Saito, Eiji
Nature Physics, 12, p.52 - 56, 2016/01
Times Cited Count：114 Percentile：96.19(Physics, Multidisciplinary)Kobayashi, Nobukiyo*; Masumoto, Hiroshi*; Takahashi, Saburo*; Maekawa, Sadamichi
Nature Communications (Internet), 5, p.4417_1 - 4417_6, 2014/07
Times Cited Count：57 Percentile：87.86(Multidisciplinary Sciences)The electric and magnetic properties of matter are of great interest for materials science and their use in electronic applications. Large dielectric and magnetoelectric responses of materials at room temperature are a great advantage for electromagnetic device applications. Here we present a study of FeCo-MgF nanogranular films exhibiting giant dielectric and magnetoelectric responses at room temperature; with dielectric constant 
'=490 and magnetoelectric response 
'/'
=3%. In these films, Fe-Co alloy-based nanometer-sized magnetic granules are dispersed in a Mg-fluoride-based insulator matrix. Insulating nanogranular films are a new class of multifunctional materials. The giant responses are caused by spin-dependent charge oscillation between magnetic granules via quantum-mechanical tunnelling. A possible application of such insulating nanogranular materials with giant response is in the construction of a tunable device, in which impedance components such as capacitance and inductance are tunable at room temperature.
Kim, J.*; Sinha, J.*; Mitani, Seiji*; Hayashi, Masamitsu*; Takahashi, Saburo*; Maekawa, Sadamichi; Yamanouchi, Michihiko*; Ohno, Hideo*
Physical Review B, 89(17), p.174424_1 - 174424_8, 2014/05
Times Cited Count：95 Percentile：93.90(Materials Science, Multidisciplinary)We have studied the underlayer thickness and temperature dependencies of the current-induced effective field in CoFeB/MgO heterostructures with Ta-based underlayers. The underlayer thickness at which the effective field saturates is found to be different between the two orthogonal components of the effective field; i.e., the dampinglike term tends to saturate at a smaller underlayer thickness than the fieldlike term. For large underlayer thickness films in which the effective field saturates, we find that the measurement temperature significantly influences the size of the effective field. A striking difference is found in the temperature dependence of the two components: the dampinglike term decreases whereas the fieldlike term increases with increasing temperature. Using a simple spin diffusion-spin transfer model, we find that all of these results can be accounted for provided the real and imaginary parts of an effective spin mixing conductance are negative. These results imply that either spin transport in this system is different from conventional metallic interfaces or effects other than spin diffusion into the magnetic layer need to be taken into account in order to model the system accurately.
Izuchi, Hiroshi*; Fukuma, Yasuhiro*; Takahashi, Saburo*; Maekawa, Sadamichi; Otani, Yoshichika*
Physical Review B, 89(8), p.081308_1 - 081308_5, 2014/02
Times Cited Count：25 Percentile：68.85(Materials Science, Multidisciplinary)Chen, Y.-T.*; Takahashi, Saburo*; Nakayama, Hiroyasu*; Althammer, M.*; Goennenwein, S. T. B.*; Saito, Eiji; Bauer, G. E. W.*
Physical Review B, 87(14), p.144411_1 - 144411_9, 2013/04
Times Cited Count：664 Percentile：99.71(Materials Science, Multidisciplinary)We present a theory of the spin Hall magnetoresistance (SMR) in multilayers made from an insulating ferromagnet F, such as yttrium iron garnet (YIG), and a normal metal N with spin-orbit interactions, such as platinum (Pt). The SMR is induced by the simultaneous action of spin Hall and inverse spin Hall effects and therefore a nonequilibrium proximity phenomenon. We compute the SMR in F|N and F|N|F layered systems, treating N by spin-diffusion theory with quantum mechanical boundary conditions at the interfaces in terms of the spin-mixing conductance. Our results explain the experimentally observed spin Hall magnetoresistance in N|F bilayers. For F|N|F spin valves we predict an enhanced SMR amplitude when magnetizations are collinear. The SMR and the spin-transfer torques in these trilayers can be controlled by the magnetic configuration.
Maekawa, Sadamichi; Takahashi, Saburo
Spin Current (2nd Edition), p.194 - 208, 2012/10
Takahashi, Saburo*; Maekawa, Sadamichi
Japanese Journal of Applied Physics, 51(1), p.010110_1 - 010110_7, 2012/01
Times Cited Count：25 Percentile：68.46(Physics, Applied)Ando, Kazuya*; Takahashi, Saburo; Ieda, Junichi; Kurebayashi, Hidekazu*; Trypiniotis, T.*; Barnes, C. H. W.*; Maekawa, Sadamichi; Saito, Eiji
Nature Materials, 10(9), p.655 - 659, 2011/09
Times Cited Count：258 Percentile：98.66(Chemistry, Physical)Hikino, Shinichi*; Mori, Michiyasu; Takahashi, Saburo; Maekawa, Sadamichi
Journal of the Physical Society of Japan, 80(7), p.074707_1 - 074707_8, 2011/07
Times Cited Count：7 Percentile：46.51(Physics, Multidisciplinary)Fukuma, Yasuhiro*; Le, W.*; Izuchi, Hiroshi*; Takahashi, Saburo; Maekawa, Sadamichi; Otani, Yoshichika*
Nature Materials, 10(7), p.527 - 531, 2011/07
Times Cited Count：168 Percentile：97.26(Chemistry, Physical)
