Development of the rectifying device for spin dynamics using asymmetric potential

• Project/Area Number: 17104005
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: OTANI Yoshichika The University of Tokyo, 物性研究所, 教授 (60245610)
• Co-Investigator(Kenkyū-buntansha): KIMURA Takashi 東京大学, 物性研究所, 助教 (80360535) ; HAMRLE Jaroslav 理化学研究所, フロンティア研究システム, 研究員 ; HARA Masahiro 理化学研究所, フロンティア研究システム, 研究員 (90392167) ; NORI Franco 理化学研究所, フロンティア研究システム, チームリーダー (50415262)
• Project Period (FY): 2005 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥80,080,000 (Direct Cost: ¥61,600,000、Indirect Cost: ¥18,480,000); Fiscal Year 2009: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000); Fiscal Year 2008: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000); Fiscal Year 2007: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000); Fiscal Year 2006: ¥18,850,000 (Direct Cost: ¥14,500,000、Indirect Cost: ¥4,350,000); Fiscal Year 2005: ¥38,870,000 (Direct Cost: ¥29,900,000、Indirect Cost: ¥8,970,000)
• Keywords: 金属スピントロニクス / 金属ナノ磁性 / スピンホール効果 / ナノ磁壁 / 非対称ポテンシャル / スピントロニクス / 分子モーター / ラチェット駆動 / スピン流 / 磁壁モーター / スピントルク

Research Abstract

We have performed research projects related to 3 topics below :
1. Ratchet dynamics of paired domain walls in a magnetic elliptic ring.
We have established the flashing ratchet which induces the rotary motion of paired magnetic domain walls in an elliptic ring structure and the local magnetometry based on the bend resistance measurement of 2 DEG cross beneath the ring. Thereby we tried to detect the spin motive force as an example of application. However the magnitude of the induced current by the spin motive force was too small to experimentally detect by using the technique established in the present study. The detection remained as a future task.
2. Control of domain wall pinning by a switchable magnetic gate.
We have demonstrated experimentally and numerically a switchable magnetic gate whereby the domain wall pinning can be magnetostatically activated by altering the magnetic alignment of paired magnetic wires from parallel to antiparallel. This magnetic gate could be a building block of the domain wall ratchet and logic devices.
3. Spin rectifying device.
We have demonstrated that spin rectification from unpolarized to polarized spin currents by using the spin Hall Effects. After optimizing the spin absorption technique applied to the lateral spin valve structure, we succeeded in observing at room temperature the spin Hall Effect in a platinum nano-wire which is 1000 times larger than the effect observed in semiconductors.

Research Products

• [Journal Article] Simulations of the dynamic switching of vortex chirality in magnetic nanodisks by a uniform field pulse (2009)
  • Author(s): R.Antos, Y.Otani
  • Journal Title: Phys.Rev.B 80
  • Peer Reviewed
• [Journal Article] Coherent Suppression of Magnetization Precession in Presence of Spin Waves in a Ni_<81>Fe_<19> Microwire (2009)
  • Author(s): A.Barman, T.Kimura, Y.Fukuma, Y.Otani
  • Journal Title: IEEE Trans.Magn. 45 Pages: 4104-4107
  • Peer Reviewed
• [Journal Article] Spin Hall effect in Molybdenum wires (2009)
  • Author(s): M.Morota, K.Ohnishi, T.Kimura, Y.Otani
  • Journal Title: J.Appl.Phys. 105
  • Peer Reviewed
• [Journal Article] Giant spin-accumulation signal and pure spin-current-induced reversible magnetization switching (2008)
  • Author(s): T. Yang, T. Kimura and Y. Otani,
  • Journal Title: Nature Physics 4 Pages: 851-854
  • Peer Reviewed
• [Journal Article] Current-excited magnetization reversal under in-plane magnetic field in a nanoscaled ferromagnetic wire (2008)
  • Author(s): Y. Togawa, T. Kimura, K. Harada, T. Matsuda, A. Tonomura, Y. Otani and T. Akashi
  • Journal Title: Appl. Phys. Lett. 92
  • Peer Reviewed
• [Journal Article] Spin current absorption and spin Hall effects in ferromagentic/nonmagnetic hybrid structures(invited) (2008)
  • Author(s): T. Kimura, Y. Otani and L. Vila
  • Journal Title: J. Appl. Phys. 103
  • Peer Reviewed
• [Journal Article] Evolution of the spin Hall effect in Ptnanowires : Size and temperature effects (2007)
  • Author(s): L. Vila, T. Kimura, Y. Otani
  • Journal Title: Phys.Rev.Lett. 99
• [Journal Article] Controlled depinning of domain walls in a ferromagnetic ring circuit (2007)
  • Author(s): M. Hara, T. Kimura, Y. Otani
  • Journal Title: Appl.Phys.Lett. 90
• [Journal Article] Room temperature reversible spin Hall effect (2007)
  • Author(s): T. Kimura, Y. Otani, T. Sato, S. Takahashi, S. Maekawa
  • Journal Title: Phys.Rev.Lett. 98
• [Journal Article] Rotational dynamics of paired nano-dom ain walls confined in an elliptical ring (2007)
  • Author(s): M. Hara, J. Shibata, T. Kimura, Y. Otani
  • Journal Title: J.Magn.Magn.Mater. 310 Pages: 2451-2452
• [Journal Article] Magnetization process in a ferromagnetic disk measured by a semiconductor two-dimensional electron gas (2007)
  • Author(s): M. Hara, Y. Otani
  • Journal Title: J.Appl.Phys. 101
• [Journal Article] Domain wall nucleation assisted by nonlocal spin injection (2007)
  • Author(s): T. Kimura, Y. Otani
  • Journal Title: J.Phys.D : Appl.Phys.: Special Issue 40 Pages: 1285-1288
• [Journal Article] Evolution of the spin Hall effect in Pt nanowires:Size and temperature effects (2007)
  • Author(s): L.Vila, T.Kimura and Y.Otani
  • Journal Title: Phys.Rev.Lett 99
  • Peer Reviewed
• [Journal Article] Controlled depinning of domain walls in a ferromagnetic ring circuit (2007)
  • Author(s): M.Hara, T.Kimura and Y.Otani
  • Journal Title: Appl.Phys.Lett 90
  • Peer Reviewed
• [Journal Article] Large spin accumulation in a Permalloy/Silver lateral spin valve (2007)
  • Author(s): T.Kimura, and Y.Otani
  • Journal Title: Phys.Rev.Lett 99
  • Peer Reviewed
• [Journal Article] Domain wall nucleation assisted by nonlocal spin injection (2007)
  • Author(s): T.Kimura, Y.Otani
  • Journal Title: J. Phys. D : Appl. Phys. 40 Pages: 1285-1288
• [Journal Article] Magnetization process in a ferromagnetic disk measured by a semiconductor two-dimensional electron gas (2007)
  • Author(s): M.Hara, Y.Otani
  • Journal Title: J. Appl. Phys. 101
• [Journal Article] Rotational dynamics of paired nano-domain walls confined in an elliptical ring (2007)
  • Author(s): M.Hara, J.Shibata, T.Kimura, Y.Otani
  • Journal Title: J. Magn. Magn. Mater. 310 Pages: 2451-2452
• [Journal Article] Room temperature reversible spin Hall effect (2007)
  • Author(s): T.Kimura, Y.Otani, T.Sato, S.Takahashi, S.Maekawa
  • Journal Title: Phys. Rev. Lett. 98
• [Journal Article] Control of domain wall pinning by a switchable magnetic gate (2006)
  • Author(s): M. Hara, J. Shibata, T. Kimura, Y. Otani
  • Journal Title: Appl.Phys.Lett. 89
• [Journal Article] Detection of magnetic state in a nano-scale ferromagnetic ring by using ballistic semiconductor two-dimensional electron gas (2006)
  • Author(s): M. Hara, J. Shibata, T. Kimura, Y. Otani
  • Journal Title: Appl.Phys.Lett 88
• [Journal Article] T. Kimura, Y. Otani, J. Hamrle (2006)
  • Author(s): Switching magnetization of nanoscale ferromagnetic particle using nonlocal spin in jection
  • Journal Title: Phys.Rev.Lett. 96
• [Journal Article] Contral of domain wall pinning by a switchable magnetic gate (2006)
  • Author(s): M.Hara, J.Shibata, T.Kimura, Y.Otani
  • Journal Title: Appl. Phys. Lett. 89
• [Journal Article] Temperature dependence of intrinsic switching current of a Co nanomagnet (2006)
  • Author(s): T.Yang, A.Hirohata, M.Hara, T.Kimura, Y.Otani
  • Journal Title: Appl. Phjys. Lett. 89
• [Journal Article] Switching magnetization of nanoscale ferromagnetic particle using nonlocal spin injection (2006)
  • Author(s): T.Kimura, Y.Otani, J.Hamrle
  • Journal Title: Phys.Rev.Lett. 96
• [Journal Article] Detection of magnetic state in a nano-scale ferromagnetic ring by using ballistic semiconductor two-dimensional electron gas (2006)
  • Author(s): M.Hara, J.Shibata, T.Kimura, Y.Otani
  • Journal Title: Appl.Phys.Lett. 88
• [Journal Article] Determination of magnetic vortex chirality using lateral spin valve geometry (2005)
  • Author(s): T.Kimura, Y.Otani, J.Hamrle
  • Journal Title: Appl.Phys.Lett 87
• [Journal Article] Influence of Au Capping Layer on Spin Accumulation in a Lateral Spin-Valve Structure (2005)
  • Author(s): T.Kimura, J.Hamrle, Y.Otani
  • Journal Title: IEEE Trans.Magn 41 Pages: 2600-2602
• [Journal Article] Estimation of spin-diffusion length from the magnitude of spin-current absorption : Multiterminal ferromagnetic /nonferromagnetic hybrid structures (2005)
  • Author(s): T.Kimura, J.Hamrle, Y.Otani
  • Journal Title: Phys.Rev.B 72
• [Journal Article] Effect of probe configuration on spin accumulation in lateral spin valve structure (2005)
  • Author(s): T.Kimura, J.Hamrle, Y.Otani, K.Tsukagoshi, Y.Aoyagi
  • Journal Title: J.Magn.Magn.Mater. 286 Pages: 88-90
• [Presentation] Efficient spin accumulation and pure-spin-current-induced magnetization switching(in vited) (2009)
  • Author(s): Y.Otani
  • Organizer: 20th International Colloquium on Magnetic Films and Surfaces
  • Place of Presentation: Berlin, Germany
  • Year and Date: 2009-07-23
• [Presentation] Spin current generation and manipulation in magnetic and non-magnetic hybrid nano-structures(invited), (2008)
  • Author(s): Y. Otane
  • Organizer: Spin Phenomena in Reduced Dimensions
  • Place of Presentation: Regensburg, Germany
  • Year and Date: 2008-09-25
• [Presentation] Spin currents, spin dynamics and spin Hall effect in metallic nanostruc tures (2007)
  • Author(s): Y. Otani
  • Organizer: IEEE MML 2007
  • Place of Presentation: University of Western Australia, Perth, Australia (invited)
• [Presentation] Switching behaviors of Co nano-rings in the current-perpendicular-to-plane configuration (2007)
  • Author(s): T. Yang, A. Hirohata, M. Hara, T. Kimura, Y. Otani
  • Organizer: APS March Meeting
  • Place of Presentation: Denver, USA
• [Presentation] Spin Hall effect in metallic systems (2007)
  • Author(s): Y. Otani
  • Organizer: ATI Intern ational workshop & IFCAM Internati onal workshop on Spin currents
  • Place of Presentation: Sendai (invited)
• [Presentation] Magnetic interactions in nano-materials (invited) (2007)
  • Author(s): Y. Otani
  • Organizer: 1^<st> Annual Symposium on Japanese-French Frontiers of Science
  • Place of Presentation: Fujisawa
• [Presentation] Detection of paired domain walls in a ferrmagnetic ring by a bend resistandce measurement (2007)
  • Author(s): M. Hara, T. Klmura and Y. Otani
  • Organizer: 17th lnternational Conference on Electronic Properties of Two-Dimensional Systems(EP2DS-17),
  • Place of Presentation: Genova,Italy
• [Presentation] Manipulation of magnetization and domain walls by non-local spin injection (2006)
  • Author(s): T. Kimura, Y. Otani
  • Organizer: 378^<th> WE-Heraues-Seminar Spin Torque in Magnetic Nanostructures
  • Place of Presentation: Physikzentrum Band Honnef, Germany (invited)
• [Presentation] Spin current manipulation and spin transfer effect in lateral spin valve devices (2006)
  • Author(s): Y. Otani, T. Kimura
  • Organizer: The International Workshop on Spin Transfer (IWST 2006)
  • Place of Presentation: Nacny, France (invited)
• [Presentation] Rotational dynamics of paired nano-domain walls confined in an elliptical ring (2006)
  • Author(s): M. Hara, J. Shibata, T. Kimura, Y. Otani
  • Organizer: International Conference on Magnetism (ICM2006)
  • Place of Presentation: Kyoto
• [Presentation] Domain wall nucleation assisted by non-local spin injection (2006)
  • Author(s): T. Kimura, Y. Otani
  • Organizer: 19^<th> International Colloquium on Magnetic Films and Surfaces (ICMFS2006)
  • Place of Presentation: Sendai
• [Presentation] Controllable domain wall pinning by an adjustable magnetic gate (2006)
  • Author(s): M. Hara, J. Shibata, T. Kimura, Y. Otani
  • Organizer: 19^<th> International Colloquium on Magnetic Films and Surfaces (ICMFS2006)
  • Place of Presentation: Sendai
• [Presentation] Manipulation of spin-current accumulation and spin transfer in lateral geometries (2006)
  • Author(s): Y. Otani
  • Organizer: 3^<rd> Joint European Magnetic Symposis (JEMS06)
  • Place of Presentation: San Sebastian, Spain (invited)
• [Presentation] Spin-current absorption and torque effects in lateral geometries (2006)
  • Author(s): Y. Otani
  • Organizer: 5^<th> International Workshop on Surface Interface and Thin Film Physics
  • Place of Presentation: Shanghai China (invited)
• [Presentation] Spin-transfer induced magnetization reversal in lateral devices (invited) (2006)
  • Author(s): Y. Otani
  • Organizer: Workshop on the latest developments in spin currents in metals and semiconductors
  • Place of Presentation: San Jose, USA
• [Presentation] Spin-torque effects due to pure spin currents in lateral geometries (2006)
  • Author(s): Y. Otani
  • Organizer: APS March Meeting
  • Place of Presentation: Baltimore, USA (invited)
• [Presentation] Manipulation of the magnetic state of a small ferromagnetic particle by means of non-local spin-injection techniques (2005)
  • Author(s): Y. Otani, T. Kimura
  • Organizer: 50^<th> Magnetism and Magnetic Materials Conference
  • Place of Presentation: San Jose, USA
• [Presentation] Magnetization reversal of ferromagnetic nano-dot by non local spin inje ction (2005)
  • Author(s): Y. Otani, T. Kimura
  • Organizer: 8^<th> International Symposium on Foun dations of Quantum Mechanics in the Light of New Technology (ISQM-Tokyo'05)
  • Place of Presentation: Hatoyama, Japan
• [Book] 21世紀の物質科学 (2008)
  • Author(s): 大谷義近, 他
  • Total Pages: 95
  • Publisher: 培風館
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