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Journal Articles

Spin colossal magnetoresistance in an antiferromagnetic insulator

Qiu, Z.*; Hou, D.*; Barker, J.*; Yamamoto, Kei; Gomonay, O.*; Saito, Eiji*

Nature Materials, 17(7), p.577 - 580, 2018/05

 Times Cited Count:71 Percentile:96.98(Chemistry, Physical)

Colossal magnetoresistance (CMR) refers to a large change in electrical conductivity induced by a magnetic field in the vicinity of a metal-insulator transition. CMR occurs due to a correlation between the magnetic structure and electron conduction and has inspired extensive studies for decades. Here, in the antiferromagnetic insulator Cr$$_{2}$$O$$_{3}$$, we found a sharp transition between conducting and nonconducting states for spin currents at room temperature. The spin-current transmission changes by two orders of magnitude within a narrow temperature window of 14K around the Neel temperature. The spin conductor-nonconductor transition can be modulated by a magnetic field, giving an isothermal change of spin-current transmission of up to 500%, effectively an on-off switch for spin currents.

Journal Articles

Antiferromagnetic anisotropy determination by spin Hall magnetoresistance

Wang, H.*; Hou, D.*; Qiu, Z.*; Kikkawa, Takashi*; Saito, Eiji; Jin, X.*

Journal of Applied Physics, 122(8), p.083907_1 - 083907_6, 2017/08

 Times Cited Count:2 Percentile:14.14(Physics, Applied)

Journal Articles

Time-resolved study of field-induced suppression of longitudinal spin Seebeck effect

Hioki, Tomosato*; Iguchi, Ryo*; Qiu, Z.*; Hou, D.*; Uchida, Kenichi*; Saito, Eiji

Applied Physics Express, 10(7), p.073002_1 - 073002_4, 2017/06

 Times Cited Count:9 Percentile:53.89(Physics, Applied)

Journal Articles

Detection of induced paramagnetic moments in Pt on Y$$_{3}$$Fe$$_{5}$$O$$_{12}$$ via X-ray magnetic circular dichroism

Kikkawa, Takashi*; Suzuki, Motohiro*; Okabayashi, Jun*; Uchida, Kenichi*; Kikuchi, Daisuke*; Qiu, Z.*; Saito, Eiji

Physical Review B, 95(21), p.214416_1 - 214416_7, 2017/06

 Times Cited Count:9 Percentile:53.89(Materials Science, Multidisciplinary)

Journal Articles

Tunable sign change of spin hall magnetoresistance in Pt/NiO/YIG structures

Hou, D.*; Qiu, Z.*; Barker, J.*; Sato, Koji*; Yamamoto, Kei; V$'e$lez, S.*; Gomez-Perez, J. M.*; Hueso, L. E.*; Casanova, F.*; Saito, Eiji

Physical Review Letters, 118(14), p.147202_1 - 147202_6, 2017/04

 Times Cited Count:85 Percentile:98(Physics, Multidisciplinary)

Journal Articles

Fabrication and magnetic control of Y$$_3$$Fe$$_5$$O$$_{12}$$ cantilevers

Seo, Y.-J.*; Harii, Kazuya; Takahashi, Ryo*; Chudo, Hiroyuki; Oyanagi, Koichi*; Qiu, Z.*; Ono, Takahito*; Shiomi, Yuki*; Saito, Eiji

Applied Physics Letters, 110(13), p.132409_1 - 132409_4, 2017/03

 Times Cited Count:12 Percentile:63.51(Physics, Applied)

We have fabricated ferrite cantilevers in which their vibrational properties can be controlled by external magnetic fields. Submicron-scale cantilever structures were made from Y$$_3$$Fe$$_5$$O$$_{12}$$ films by physical etching combined with the use of a focused ion beam milling technique. We found that the cantilevers exhibit two resonance modes which correspond to horizontal and vertical vibrations. Under external magnetic fields, the resonance frequency of the horizontal mode increases, while that of the vertical mode decreases, quantitatively consistent with our numerical simulation for magnetic forces. The changes in resonance frequencies with magnetic fields reach a few percent, showing that an efficient magnetic control of resonance frequencies was achieved.

Journal Articles

Magnon polarons in the spin Seebeck effect

Kikkawa, Takashi*; Shen, K.*; Flebus, B.*; Duine, R. A.*; Uchida, Kenichi*; Qiu, Z.*; Bauer, G. E. W.*; Saito, Eiji

Physical Review Letters, 117(20), p.207203_1 - 207203_6, 2016/11

 Times Cited Count:87 Percentile:96.97(Physics, Multidisciplinary)

Journal Articles

Spin-current probe for phase transition in an insulator

Qiu, Z.*; Li, J.*; Hou, D.*; Arenholz, E.*; N'Diaye, A. T.*; Tan, A.*; Uchida, Kenichi*; Sato, Koji*; Okamoto, Satoshi*; Tserkovnyak, Y.*; et al.

Nature Communications (Internet), 7, p.12670_1 - 12670_6, 2016/08

 Times Cited Count:107 Percentile:97.44(Multidisciplinary Sciences)

Journal Articles

Observation of temperature-gradient-induced magnetization

Hou, D.*; Qiu, Z.*; Iguchi, Ryo*; Sato, Koji*; Vehstedt, E. K.*; Uchida, Kenichi*; Bauer, G. E. W.*; Saito, Eiji

Nature Communications (Internet), 7, p.12265_1 - 12265_6, 2016/07

 Times Cited Count:10 Percentile:65.26(Multidisciplinary Sciences)

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:100 Percentile:97.17(Multidisciplinary Sciences)

Journal Articles

Enhancement of anomalous Nernst effects in metallic multilayers free from proximity-induced magnetism

Uchida, Kenichi*; Kikkawa, Takashi*; Seki, Takeshi*; Oyake, Takafumi*; Shiomi, Junichiro*; Qiu, Z.*; Takanashi, Koki*; Saito, Eiji

Physical Review B, 92(9), p.094414_1 - 094414_6, 2015/09

 Times Cited Count:57 Percentile:91.98(Materials Science, Multidisciplinary)

Journal Articles

All-oxide spin Seebeck effects

Qiu, Z.*; Hou, D.*; Kikkawa, Takashi*; Uchida, Kenichi*; Saito, Eiji

Applied Physics Express, 8(8), p.083001_1 - 083001_3, 2015/08

 Times Cited Count:23 Percentile:74.03(Physics, Applied)

Journal Articles

Observation of inverse spin Hall effect in ferromagnetic FePt alloys using spin Seebeck effect

Seki, Takeshi*; Uchida, Kenichi*; Kikkawa, Takashi*; Qiu, Z.*; Saito, Eiji; Takanashi, Koki*

Applied Physics Letters, 107(9), p.092401_1 - 092401_4, 2015/08

 Times Cited Count:31 Percentile:81.58(Physics, Applied)

Journal Articles

Critical suppression of spin Seebeck effect by magnetic fields

Kikkawa, Takashi*; Uchida, Kenichi*; Daimon, Shunsuke*; Qiu, Z.*; Shiomi, Yuki*; Saito, Eiji

Physical Review B, 92(6), p.064413_1 - 064413_9, 2015/08

 Times Cited Count:127 Percentile:97.6(Materials Science, Multidisciplinary)

Journal Articles

Intrinsic surface magnetic anisotropy in Y$$_{3}$$Fe$$_{5}$$O$$_{12}$$ as the origin of low-magnetic-field behavior of the spin Seebeck effect

Uchida, Kenichi*; Oe, Junichiro*; Kikkawa, Takashi*; Daimon, Shunsuke*; Hou, D.*; Qiu, Z.*; Saito, Eiji

Physical Review B, 92(1), p.014415_1 - 014415_8, 2015/07

 Times Cited Count:26 Percentile:77.37(Materials Science, Multidisciplinary)

Journal Articles

Spin-current injection and detection in $$kappa$$-(BEDT-TTF)$$_{2}$$Cu[N(CN)$$_{2}$$]Br

Qiu, Z.*; Uruichi, Mikio*; Hou, D.*; Uchida, Kenichi*; Yamamoto, Hiroshi*; Saito, Eiji

AIP Advances (Internet), 5(5), p.057167_1 - 057167_7, 2015/05

 Times Cited Count:14 Percentile:59.87(Nanoscience & Nanotechnology)

Journal Articles

Extending resonant inelastic X-ray scattering to the extreme ultraviolet

Wray, L. A.*; Huang, S.-W.*; Jarrige, I.*; Ikeuchi, Kazuhiko*; Ishii, Kenji; Li, J.*; Qiu, Z. Q.*; Hussain, Z.*; Chuang, Y.-D.*

Frontiers in Physics (Internet), 3, p.32_1 - 32_11, 2015/05

 Times Cited Count:4

Journal Articles

Influence of interface condition on spin-Seebeck effects

Qiu, Z.*; Hou, D.*; Uchida, Kenichi*; Saito, Eiji

Journal of Physics D; Applied Physics, 48(16), p.164013_1 - 164013_5, 2015/04

 Times Cited Count:35 Percentile:84.67(Physics, Applied)

Journal Articles

Enhancement of spin-Seebeck effect by inserting ultra-thin Fe$$_{70}$$Cu$$_{30}$$ interlayer

Kikuchi, Daisuke*; Ishida, Masahiko*; Uchida, Kenichi*; Qiu, Z.*; Murakami, T.*; Saito, Eiji

Applied Physics Letters, 106(8), p.082401_1 - 082401_4, 2015/02

 Times Cited Count:23 Percentile:74.03(Physics, Applied)

Journal Articles

Spin Hall magnetoresistance at high temperatures

Uchida, Kenichi*; Qiu, Z.*; Kikkawa, Takashi*; Iguchi, Ryo*; Saito, Eiji

Applied Physics Letters, 106(5), p.052405_1 - 052405_5, 2015/02

 Times Cited Count:15 Percentile:62.19(Physics, Applied)

30 (Records 1-20 displayed on this page)