研究成果

　物理学部門での研究成果は こちら

[九州大学着任前の論文] 　[稲盛センターでの研究成果]

学術論文

A. Barman, T. Kimura, Y. Otani, Y. Fukuma, K. Akahane and S. Meguro:

"Benchtop time-resolved magneto-optical Kerr magnetometer."

Rev. Sci. Inst. 79, 123905 (2008).

T. Yang, T. Kimura and Y. Otani:

"Highly efficient nonlocal spin injection and pure-spin-current-induced magnetization switching."

Nat. Phys. 11, 851 (2008).

T. Kimura and Y. Otani:

"Local domain structure of exchange coupled NiFe/CoO nanowire probed by nonlocal spin valve measurement."

J. Appl. Phys. 103, 083915 (2008).

K. Ohnishi, T. Kimura and Y. Otani:

"Improvement of superconductive properties of mesoscopic Nb wires by Ti passivation layers."

Appl. Phys. Exp. 1, 021701 (2008).

T. Kimura, T. Sato and Y. Otani:

"Temperature evolution of spin relaxation in NiFe/Cu lateral spin valve."

Phys. Rev. Lett. 100, 066602 (2008).

Y. Togawa, T. Kimura, K. Harada, T. Matsuda, A. Tonomura, Y. Otaniand T. Akashi:

"Current-excited magnetization reversal under in-plane magnetic field in a nanoscaled ferromagnetic wire."

Appl. Phys. Lett. 92, 012505 (2008).

T. Kimura, Y. Otani and L. Vila:

"Spin current absorption and spin Hall effect in ferromagentic/nonmagnetic hybrid structures."

J. Appl. Phys. 103, 07F310 (2008).

K. Fukumoto, T. Matsushita, H. Osawa, T. Nakamura, T. Muro, K. Arai, T. Kimura, Y. Otani and T. Kinoshita:

"Construction and development of a time-resolved x-ray magnetic circular dichroism-photoelectron emission microscopy system using femtosecond laser pulses at BL25SU SPring-8."

Rev. Sci. Instrum. 79, 063903 (2008).

M. Hara, T. Kimura and Y. Otani:

"Detection of paired domain walls in a ferromagnetic ring by a bend resistance measurement."

Physica E 40, 1108 (2008).

L. Vila, T. Kimura and Y. Otani:

"Evolution of the spin Hall effect in Pt nanowires: Size and temperature effects."

Phys. Rev. Lett. 99, 226604 (2007).

T. Kimura and Y. Otani:

"Large spin accumulation in a Permally/Silver lateral spin valve."

Phys. Rev. Lett. 99, 196604 (2007).

T. Yang, A. Hirohata, L. Vila, T. Kimura and Y. Otani:

"Vertical stack of Co nanorings with current-perpendicular-to-plane giant magnetoresistance: Experiment and micromagnetic simulation."

Phys. Rev. B 76, 172401 (2007).

T. Kimura, Y. Otani and P. M. Levy:

"Electrical control of the direction of spin accumulation."

Phys. Rev. Lett. 99, 166601 (2007).

K. Aoshima, N. Funabashi, K. Machida, Y. Miyamoto, N. Kawamura, K. Kuga, N. Shimidzu, F. Sato, T. Kimura and Y. Otani:

"Spin transfer switching in current-perpendicular-to-plane spin valve observed by magneto-optical Kerr effect using visible light."

Appl. Phys. Lett. 91, 052507 (2007).

M. Hara, T. Kimura and Y. Otani:

"Controlled depinning of domain walls in a ferromagnetic ring circuit."

Appl. Phys. Lett. 90, 242504 (2007).

T. Kimura and Y. Otani:

"Magnetization process of single magnetic ring detected by nonlocal spin valve measurement."

J. Appl. Phys. 101, 126102 (2007).

T. Yang, A. Hirohata, T. Kimura and Y. Otani:

"Domain formation induced by perpendicular spin injection."

J. Magn. Magn. Mater. 310, E690 (2007).

M. Hara, J. Shibata, T. Kimura and Y. Otani:

"Rotational dynamics of paired nano-domain walls confined in an elliptical ring."

J. Magn. Magn. Mater. 310, 2451 (2007).

T. Ishida, T. Kimura and Y. Otani:

"Spin-current induced vortex displacement and annihilation in micro-scale Permalloy disk."

J. Magn. Magn. Mater. 310, 2431 (2007).

T. Kimura, Y. Otani, T. Sato, S. Takahashi and S. Maekawa:

"Room temperature reversible spin Hall effect."

Phys. Rev. Lett. 98, 156601 (2007).

T. Kimura, Y. Otani H. Masaki, T. Ishida, R. Antos and J. Shibata:

"Vortex motion in chilarity-controlled pair of magnetic disks."

Appl. Phys. Lett. 90, 132501 (2007).

T. Kimura and Y. Otani:

"Spin transport in lateral ferromagnetic/nonmagnetic hybrid structures." (invited)

J. Phys.: Condens. Matter 19, 165216 (2007).

T. Yang, A. Hirohata, M. Hara, T. Kimura and Y. Otani:

"Current-induced vortex-vortex switching in a nanopillar comprising two Co nano-ring."

Appl. Phys. Lett. 90, 092505 (2007).

T. Kimura and Y. Otani:

"Domain wall nucleation assisted by nonlocal spin injection."

J. Phys. D: Appl. Phys. 40, 1285 (2007).

Y. Togawa, T. Kimura, K. Harada, T. Akashi, T. Matsuda, A. Tonomura and Y. Otani:

"Domain nucleation and annihilation in uniformly magnetized state under current pulses in narrow ferromagnetic wires."

Jpn. J. Appl. Phys. 45, L1322 (2006).

T. Yang, M. Hara, A. Hirohata, T. Kimura and Y. Otani:

"Magnetic characterization and switching of Co nanorings in current-perpendicular-to-plane configuration."

Appl. Phys. Lett. 90, 022504 (2006).

T. Yang, A. Hirohata, T. Kimura and Y. Otani:

"Manipulating spin current in the magnetic nanopillar."

J. Nanosci. Nanotechnol. 7, 259 (2007).

T. Yang, A. Hirohata, T. Kimura and Y. Otani:

"Estimation of local and nonlocal contributions to the current-induced magnetization switching."

Phys. Rev. B 74, 153301 (2006).

T. Yang, A. Hirohata, T. Kimura and Y. Otani:

"Spin-transfer-induced magnetic domain formation."

J. Appl. Phys. 100, 073906 (2006).

R. Antos, J. Mistrik, T. Yamaguchi, M. Veis, E. Liskova, S. Visnovsky, J. Pistora, B. Hillebrands, S. O. Demokritov, T. Kimura and Y. Otani:

"Magneto-optical spectroscopic scatterometry for analyzing patterned magnetic nanostructures."

J. Magn. Soc. Jpn. 30, 630 (2006).

M. Hara, J. Shibata, T. Kimura and Y. Otani:

"Control of domain wall pinning by a switchable magnetic gate."

Appl. Phys. Lett. 89, 192504 (2006).

Y. Togawa, T. Kimura, K. Harada, T. Akashi, T. Matsuda, A. Tonomura and Y. Otani:

"Current-excited magnetization dynamics in narrow ferromagnetic wires."

Jpn. J. Appl. Phys. 45, L683 (2006).

T. Ishida, T. Kimura and Y. Otani:

"Current-induced vortex displacement and annihilation in a single permalloy disk."

Phys. Rev. B 74, 014424 (2006).

Y. Otani and T. Kimura:

"Manipulation of the magnetic state of a small ferromagnetic particle by means of nonlocal spin-injection techniques." (invited)

J. Appl. Phys. 99, 08G506 (2006).

T. Kimura, Y. Otani and J. Hamrle:

Enhancement of spin accumulation in a nonmagnetic layer by reducing junction size."

Phys. Rev. B 73, 132405 (2006).

T. Yang, A. Hirohata, T. Kimura and Y. Otani:

"Influence of capping layer on the current-induced magnetization switching in magnetic nanopillars."

J. Appl. Phys. 99, 073708 (2006).

M.Hara, J.Shibata,T. Kimura and Y.Otani:

"Detection of magnetic state in a nano-scale ferromagnetic ring by using ballistic semiconductor two-dimensional electron gas."

Appl. Phys. Lett. 88, 082501 (2006).

T. Kimura, Y. Otani and J. Hamrle:

"Switching magnetization of nanoscale ferromagnetic particle using nonlocal spin injection."

Phys. Rev. Lett. 96, 037201 (2006).

T. Yang, J. Hamrle, T. Kimura and Y. Otani:

"Roles of spin-polarized current and spin accumulation in the current-induced magnetization switcing."

J. Magn. Magn. Mater. 301, 389 (2006).

J. Hamrle, T. Kimura, T. Yang and Y. Otani:

"Three-dimensional distribution of the spin-polarized current inside nanostructures."

J. Appl. Phys. 98, 064301 (2005).

T. Yang, J. Hamrle, T. Kimura,and Y. Otani:

"Influence of top electrode on the current-induced magnetic switching in magnetic nanopillars."

Appl. Phys. Lett. 87, 162502 (2005).

T. Kimura, Y. Otani and J. Hamrle:

"Determination of magnetic vortex chirality using lateral spin valve geometry."

Appl. Phys. Lett. 87, 172506 (2005).

T. Kimura, J. Hamrle and Y. Otani:

"Influence of Au capping layer on spin accumulation in a lateral spin-valve structure."

IEEE Trans. Magn. 41, 2600 (2005).

T. Kimura, J. Hamrle and Y. Otani:

"Estimation of spin-diffusion length from the magnitude of spin-current absorption: multiterminal ferromagnetic/nonferromagnetic hybrid structures."

Phys. Rev. B 72, 014461 (2005).

J. Hamrle, T. Kimura, T. Yang and Y. Otani:

"Three-dimensional distribution of spin-polarized current inside (Cu/Co) pillar structures."

Phys. Rev. B 71, 094434 (2005).

T. Yang, T. Kimura and Y. Otani:

"Spin-injection-induced intermediate state in a Co nanopillar."

J. Appl. Phys. 97, 064304 (2005).

J. Hamrle, T. Kimura, Y. Otani, K. Tsukagoshi and Y. Aoyagi:

"Current distribution inside Py/Cu lateral spin-valve device."

Phys. Rev. B 71, 094402 (2005).

T. Kimura, J. Hamrle and Y. Otani:

"Spin-polarized current induced in a single ferromagnetic strip due to inhomogeneous spin injection."

J. Appl. Phys. 97, 076102 (2005).

T. Kimura, J. Hamrle, Y. Otani, K. Tsukagoshi and Y. Aoyagi:

"Effect of probe configuration on spin accumulation in lateral spin valve structure."

J. Magn. Magn. Mater. 286, 88 (2005).

T. Kimura, J. Hamrle, Y. Otani, K. Tsukagoshi and Y. Aoyagi:

"Enhancement of non-local spin-valve signal using spin accumulation in local spin-valve configuration."

Appl. Phys. Lett. 85, 5382 (2004).

T. Kimura, J. Hamrle, Y. Otani, K. Tsukagoshi and Y. Aoyagi:

"Suppression of spin accumulation in non-magnet due to ferromagnetic ohmic contact."

Appl. Phys. Lett. 85, 3795 (2004).

T. Kimura, J. Hamrle, Y. Otani, K. Tsukagoshi and Y. Aoyagi:

"Spin-dependent boundary resistance in the lateral spin valve structure."

Appl. Phys. Lett. 85, 3501 (2004).

T. Kimura, Y. Otani, K. Tsukagoshi and Y. Aoyagi:

"Non-local Hall resistance measured in submicron-scale nonmagnetic/ferromagnetic junctions."

J. Magn. Magn. Mater. 272-276, E1333 (2004).

T. Kimura, Y. Otani, I. Yagi, K. Tsukagoshi and Y. Aoyagi:

"Domain wall drag due to dc current injection into ferromagnetic nano-wires."

J. Magn. Magn. Mater. 272-276, E1347 (2004).

赤羽 浩一, 木村 崇，大谷 義近:

「高感度マイクロKerr磁化測定装置の開発」

日本応用磁気学会誌 28, 122 (2004).

T. Kimura, Y. Otani, I. Yagi, K. Tsukagoshi and Y. Aoyagi:

"Spin current assisted domain wall depinning in a submicron magnetic wire."

J. Appl. Phys. 94, 7947 (2003).

T. Kimura, Y. Otani, K. Tsukagoshi and Y. Aoyagi:

"Suppressed pinning field of a trapped domain wall due to dc current injection."

J. Appl. Phys. 94, 7266 (2003).

M. Itou, M. Kasai, T. Kimura, J. Yanagisawa, F. Wakaya, Y. Yuba and K. Gamo:

"Maskless Mn implantation in GaAs using focused Mn ion beam."

Nucl. Instr. and Meth. in Phys. Res. B 206, 1013 (2003).

T. Kimura, F. Wakaya and K. Gamo:

"Fabrication of Spin-Current-Induced Domain-Wall-Nucleation Device in Planar Configuration."

J. Vac. Sci. Tech. B 20, 2814 (2002).

T. Kimura, Y. Itagaki, F. Wakaya and K. Gamo:

"Fabrication of Planar-Type Ferromagnet/Nonmagnet/Ferromagnet Structures Using Multiangle Deposition."

Jpn. J. Appl. Phys. 41, 4385 (2002).

T. Kimura, F. Wakaya and K. Gamo:

"Control of magnetization rotation using cross geometry."

J. Magn. Magn. Mater. 248, 286 (2002).

T. Kimura, Y. Itagaki, F. Wakaya and K. Gamo:

"Study of Magnetostastic Interaction in Magnetic Multilayer Using Exchange Anistropy."

Trans. Magn. Soc. Jpn. 2, 49 (2002).

T. Kimura, Y. Itagaki, F. Wakaya and K. Gamo:

"Control of domain structure in magnetic multilayer using submicron-patterned antiferromagnetic structure."

Microelectro. Eng. 61-62, 581 (2002).

T. Kimura, F. Wakaya and K. Gamo:

"Study of Dipole Interaction in Magnetic-Multilayer Wires Using Exchange Anisotropy."

Proceedings of CJSTF 2001, 137 (2001).

T. Kimura, F. Wakaya and K. Gamo:

"Effects of Stray Fields in Flat-End and Pointed-End NiFe/Cu/NiFe/NiO Wires."

Jpn. J. Appl. Phys. 40, 6357 (2001).

T. Kimura, F. Wakaya, K. Gamo:

"Effect of stary field induced by cross shape in a 200-nm-wide Co wire."

J. Magn. Magn. Mater. 236, 262 (2001).

T. Kimura, F. Wakaya and K. Gamo:

"Galvanomagnetic Effect and Magnetization Process in CoO/Co/NiFe Film with Antidot Array."

Jpn. J. Appl. Phys. 40, 4524 (2001).

T. Kimura, Y Itagaki, F. Wakaya and K. Gamo:

"Study of dipole interaction in micron-width NiFe/Cu/NiFe/NiO wire using exchange anisotropy."

Appl. Phys. Lett. 78, 4007 (2001).

木村 崇, 生嶋 君弥, 若家 冨士男, 蒲生 健次:

「サブミクロン強磁性細線におけるホール抵抗の制御」

日本応用磁気学会誌 25, 695 (2001).

T. Kimura, G. Mozumi, F. Wakaya and K. Gamo:

"Effects of Shape Anisotropy in CoO/Co/Cu/NiFe/Cu/Co Wires."

Jpn. J. Appl. Phys. 40, 2241 (2001).

T. Kimura, F. Wakaya and K. Gamo:

"Magnetization Processes in Narrow and Wide Cross-Shaped Wires of Co/Cu/NiFe Structures."

Jpn. J. Appl. Phys. 40, 1246 (2001).

T. Kimura, F. Wakaya, J. Yanagisawa, Y. Yuba and K. Gamo:

"Galvanomagnetic Effect of Submicron Exchange-Coupled Co/Ni Wire."

Jpn. J. Appl. Phys. 39, 6526 (2000).

T. Kimura, F. Wakaya, J. Yanagisawa, Y. Yuba and K. Gamo:

"Magnetization process and resistance jumps in a submicron-scale cross-shaped wire."

J. Magn. Magn. Mater. 222, 79 (2000).

S. Imada, S. Ueda, R. Jung, Y. Saitoh, M. Kotsugi, W. Kuch, J. Gilles, S. Kang, F. Offi, J. Kirschner, H. Daimon, T. Kimura, J. Yanagisawa, K. Gamo and S. Suga:

"Metastable Domain Structures of Ferromagnetic Microstructures Observed by Soft X-Ray Magnetic Circular Dichroism Microscopy."

Jpn. J. Appl. Phys. 39, L585 (2000).

木村 崇, 生嶋 君弥, 若家 冨士男, 蒲生 健次:

「メゾスコピックスケール十字型磁性細線における電流磁気効果」

日本応用磁気学会誌 24, 471 (2000).

T. Kimura, K. Ikushima, F. Wakaya and K. Gamo:

"Resistance Jumps in Planar Hall Effect of Nano-Scale Co Magnetic Wire."

Proceedings of magel '99, 431 (1999).

T. Kimura, F. Wakaya, J. Yanagisawa, Y. Yuba, K. Gamo:

"Exchange Interaction from Current and Voltage Probes in Galvanomagnetic Effect in Poly-Crystal Co Thin Film."

Jpn. J. Appl. Phys. 38, 4737 (1999).