RECENT PUBLICATIONS


preprints

Quantitative characterization of the spin orbit torque using harmonic Hall voltage measurements.
M. Hayashi, J. Kim, M. Yamanouchi, H. Ohno.
arXiv:1310.4879.

Interface control of the magnetic chirality in TaN|CoFeB|MgO heterosctructures.
J. Torrejon, J. Kim, J. Sinha, M. Yamanouchi, S. Mitani, M. Hayashi, H. Ohno.
arXiv:1308.1751.
  • Related materials: Kavli institute for theoretical physics "Concepts of Spintronics", Santa Barbara (2013).


    • 2013

    Large perpendicular magnetic anisotropy at Fe/MgO interface
    J. W. Koo , S. Mitani , T. T. Sasaki , H. Sukegawa , Z. C. Wen , T. Ohkubo , T. Niizeki , K. Inomata and K. Hono
    Appl. Phys. Lett. 103 , 192401 (2013).

    Low-resistive monocrystalline Mg-Al-O barrier magnetic tunnel junctions for spin-transfer magnetization switching
    H. Sukegawa , S. Mitani , T. Ohkubo , K. Inomata and K. Hono
    Appl. Phys. Lett. 103 , 142409 (2013).

    Temperature dependence of magnetoresistive output of pseudo spin valves with Co2Fe(Al1- xSix) Heusler alloys and a Ag spacer
    T. Furubayashi, T. M. Nakatani, H. S. Goripati, H. Sukegawa, Y. K. Takahashi, K. Inomata and K. Hono
    J. Appl. Phys. 114, 123910 (2013).

    Large anisotropic Fe orbital moments in perpendicularly magnetized Co2FeAl Heusler alloy thin films revealed by angular-dependent x-ray magnetic circular dichroism
    J. Okabayashi, H. Sukegawa, Z. Wen, K. Inomata and S. Mitani
    Appl. Phys. Lett. 103, 102402 (2013).

    Enhanced interface perpendicular magnetic anisotropy in Ta-CoFeB-MgO using nitrogen doped Ta underlayers.
    J. Sinha, M. Hayashi, A. Kellock, S. Fukami, M. Yamanouchi, H. Sato, S. Ikeda, S. Mitani, S. Yang, S. S. P. Parkin and H. Ohno.
    Appl. Phys. Lett. 102, 242405 (2013).
  • See more on "Enhanced interface perpendicular magnetic anisotropy"

    • Layer thickness dependence of the current induced effective field vector in Ta|CoFeB|MgO.
    J. Kim, J. Sinha, M. Hayashi, M. Yamanouchi, S. Fukami, T. Suzuki, S. Mitani, and H. Ohno.
    Nature Mater. 12, 240 (2013).
  • See more on "Vector measurments of current induced torques in magnetic heterostructures"
  • Related materials: APS March meeting, Baltimore (2013).



    • 2012

    Evaluation of spin Hall angle and spin diffusion length by using spin current-induced ferromagnetic resonance.
    K. Kondou, H. Sukegawa, S. Mitani, K. Tsukagoshi, S. Kasai.
    APEX. 5, 073002 (2012)
  • See more on "Spin Hall angle of Pt and Pd"

    • Magnetic Tunnel Junctions with Perpendicular Anisotropy Using a Co2FeAl Full-Heusler Alloy.
    Z. C. Wen, H. Sukegawa, S. Kasai, M. Hayashi, S. Mitani, and K. Inomata.
    Appl. Phys. Exp. 5, 063003 (2012).
  • See more on "Magnetic Tunnel Junctions with Perpendicular Co2FeAl Heusler Alloy"

    • Microwave assisted resonant domain wall nucleation in permalloy nanowires.
    M. Hayashi, Y. K. Takahashi, and S. Mitani.
    Appl. Phys. Lett., 101, 172406 (2012).
  • See more on "Resonant domain wall nucleation"

    • Spin-transfer switching in full-Heusler Co2FeAl-based magnetic tunnel junctions.
    H. Sukegawa, Z. C. Wen, K. Kondou, S. Kasai, S. Mitani, and K. Inomata.
    Appl. Phys. Lett. 100 (2012) 182403.
  • See more on "Spin-transfer switching in full-Heusler Co2FeAl-based magnetic tunnel junctions"

    • Time-Domain Observation of the Spinmotive Force in Permalloy Nanowires.
    M. Hayashi, J. Ieda, Y. Yamane, J.Ohe, Y. K. Takahashi, S. Mitani, and S. Maekawa.
    Phys. Rev. Lett. 108, 147202 (2012).
  • See more on "Realtime detection of the Spinmotive force"

    • Spatial control of magnetic anisotropy for current induced domain wall injection in perpendicularly magnetized CoFeB|MgO nanostructures.
    M. Hayashi, M. Yamanouchi, S. Fukami, J. Sinha, S. Mitani, and H. Ohno.
    Appl. Phys. Lett. 100, 192411 (2012).
  • See more on "Spatial control of magnetic anisotropy"

    • Spin polarization and Gilbert damping of Co2Fe(GaxGe1-x) Heusler alloys.
    B. Varaprasad, A. Srinivasan, Y. K. Takahashi, M. Hayashi, A. Rajanikanth, and K. Hono.
    Acta Mater. 60, 6257 (2012).

    Domain wall dynamics driven by spin transfer torque and the spin-orbit field.
    M. Hayashi, Y. Nakatani, S. Fukami, M. Yamanouchi, S. Mitani and H. Ohno.
    J. Phys. Cond. Matter. 24, 024221 (2012).

    All-metallic lateral spin valves using Co2Fe(Ge0.5Ga0.5) Heusler alloy with a large spin signal.
    Y. K. Takahashi, S. Kasai, S. Hirayama, S. Mitani and K. Hono.
    Appl. Phys. Lett. 100, 052405 (2012).



    2011

    Current induced alignment of bi-quadratic interlayer exchange coupled magnetic layers in Heusler based magnetoresistive pillars
    H. S. Goripati, M. Hayashi, T. Furubayashi, T. Taniguchi, H. Sukegawa, Y. K. Takahashi and K. Hono
    J. Appl. Phys. 110, 123914 (2011).

    Structural instability of FeCo ultrathin films grown on MgO(100)
    S. Mitani and T. Niizeki
    J. Phys.: Conf. Ser. 266, 012121 (2011).

    Tunnel magnetoresistance in textured Co2FeAl/MgO/CoFe based magnetic tunnel junctions on a Si/SiO2 amorphous substrate
    Z. C. Wen, H. Sukegawa, S. Mitani and K. Inomata
    Appl. Phys. Lett. 98, 192505 (2011).

    Perpendicular magnetization of Co2FeAl full-Heusler alloy films induced by MgO interface
    Z. C. Wen, H. Sukegawa, S. Mitani and K. Inomata
    Appl. Phys. Lett. 98, 242507 (2011).
  • See more on "Perpendicular magnetic anisotropy in Co2FeAl Heusler alloy"

    • Spin-transfer magnetization switching in ordered alloy-based nanopillar devices
    S. Mitani
    J. Phys. D: Appl. Phys. 44, 384003 (2011).

    Large amplitude microwave emission and reduced nonlinear phase noise in Co2Fe(Ge0.5Ga0.5) Heusler alloy based pseudo spin valve nanopillars
    J. Sinha, M. Hayashi, Y. K. Takahashi, T. Taniguchi, M. Drapeko, S. Mitani and K. Hono
    Appl. Phys. Lett. 99, 162508 (2011).
  • See more on "Narrow linewdith spin torque oscillators using Co2Fe(Ge0.5Ga0.5) Heusler alloy"

    • Correlation between symmetry-selective transport and spin-dependent resonant tunneling in fully epitaxial Cr/ultrathin-Fe/MgO/Fe(001) magnetic tunnel junctions
    T. Niizeki, H. Sukegawa, S. Mitani, N. Tezuka and K. Inomata
    Appl. Phys. Lett. 99, 182508 (2011).
  • See more on "Spin dependent resonant tunneling"

    • Oscillatory antiferromagnetic interlayer exchange coupling in Co2Fe(Al0.5Si0.5)/Ag/Co2Fe(Al0.5Si0.5) films and its application to trilayer magnetoresistive sensor
    T. M. Nakatani, S. Mitani, T. Furubayashi and K. Hono
    Appl. Phys. Lett. 99, 182505 (2011).

    Crystallinity and Transport Properties in Fe/MgAl2O4/Fe(001) Epitaxial Magnetic Tunnel Junctions
    H. Sukegawa, H. Xiu, T. Ohkubo, T. Niizeki, S. Kasai, T. Furubayashi, S. Mitani, K. Inomata, and K. Hono
    J. Magn. Soc. Jpn., 35, 254-259 (2011).

    Dynamics of coupled vortices in a pair of ferromagnetic disks
    S. Sugimoto, Y. Fukuma, S. Kasai, T. Kimura, A. Barman, and Y. Otani
    Phys. Rev. Lett. 106, 197203 (2011).

    Large magnetoresistance in current-perpendicular-to-plane pseudospin valve using a Co2Fe(Ge0.5Ga0.5) Heusler alloy
    Y. K. Takahashi, A. Srinivasan, B. Varaprasad, A. Rajanikanth, N. Hase, T. M. Nakatani, S. Kasai, T. Furubayashi, and K. Hono
    Appl. Phys. Lett. 98, 152501 (2011).

    Fully epitaxial Fe/MgO/Fe(001) junctions with nonmagnetic metal layer insertion
    T. Niizeki, S. Mitani, H. Sukegawa, S. Kasai, and K. Inomata
    J. Appl. Phys. 109, 07C726 (2011).

    Enhancement of current-perpendicular-to-plane giant magnetoresistance by insertion of Co50Fe50 layers at the Co2Mn(Ga0.5Sn0.5)/Ag interface
    N. Hase, T. M. Nakatani, S. Kasai, Y. K. Takahashi, and K. Hono
    J. Appl. Phys. 109, 07E112 (2011).



    2010

    Time Resolved Inductive Detection of Domain Wall Dynamics in Magnetic Nanowires
    M. Hayashi, S. Kasai, and S. Mitani
    Appl. Phys. Express 3, 113004 (2010).

    Current-perpendicular-to-plane spin valves with a Co2MnGa0.5Sn0.5 Heusler alloy
    N. Hase, B. Varaprasad, T. M. Nakatani, H. Sukegawa, S. Kasai, Y. K. Takahashi, T. Furubayashi and K. Hono
    J. Appl. Phys. 108, 093916 (2010).

    Spin polarization of currents in Co/Pt multilayer and Co-Pt alloy thin fims
    A. Rajanikanth, S. Kasai, N. Ohshima, and K. Hono
    Appl. Phys. Lett. 97, 022505 (2010).

    Structure and transport properties of current-perpendicular-to-plane spin valves using Co2FeAl0.5Si0.5 and Co2MnSi Heusler alloy electrodes
    T. Furubayashi, K. Kodama, T. M. Nakatani, H. Sukegawa, Y. K. Takahashi, K. Inomata, and K. Hono
    J. Appl. Phys. 107, 113917 (2010).

    Tunnel Magnetoresistance with Improved Bias Voltage Dependence in Lattice-Matched Fe/Spinel MgAl2O4/Fe(001) Junctions
    Hiroaki Sukegawa, Huixin Xiu, Tadakatsu Ohkubo, Takao Furubayashi, Tomohiko Niizeki, Wenhong Wang, Shinya Kasai, Seiji Mitani, Koichiro Inomata, and Kazuhiro Hono
    Appl. Phys. Lett. 96, 212505 (2010).
  • See more on "Magnetic tunnel junctions with Spinel MgAl2O4 barrier"

    • Bulk and Interfacial Scatterings in Current-Perpendicular-to-Plane Giant Magnetoresistance with Co2Fe(Al0.5Si0.5) Heusler Alloy Layers and Ag Spacer
    T. M. Nakatani , Takao Furubayashi , Shinya Kasai , Hiroaki Sukegawa , Y. K. Takahashi , Seiji Mitani, and Kazuhiro Hono
    Appl. Phys. Lett. 96, 212501 (2010).

    High spin-filter efficiency in a Co ferrite fabricated by a thermal oxidation
    Y. K. Takahashi, S. Kasai, T. Furubayashi, S. Mitani, K. Inomata and K. Hono
    Appl. Phys. Lett. 96, 072512 (2010).

    Coherent Tunneling and Giant Tunneling Magnetoresistance in Co2FeAl/MgO/CoFe Magnetic Tunneling Junctions
    Wenhong Wang, Enke Liu, Masaya Kodzuka, Hiroaki Sukegawa, Marec Wojcik, Eva Jedryka, G. H. Wu, Koichiro Inomata, Seiji Mitani, and Kazuhiro Hono
    Phys. Rev. B 81, 140402 (2010).

    Spin-transfer switching in an epitaxial spin-valve nanopillar with a full-Heusler Co2FeAl0.5Si0.5 alloy
    Hiroaki Sukegawa, Shinya Kasai, Takao Furubayashi, Seiji Mitani, and Koichiro Inomata
    Appl. Phys. Lett. 96, 042508 (2010).
  • See more on "Spin transfer magnetization switching in full-Heusler Co2FeAl0.5Si0.5 spin valves"

    • A New Spin-Functional Metal-Oxide-Semiconductor Field-Effect Transistor Based on Magnetic Tunnel Junction Technology: Pseudo-Spin-MOSFET
    Yusuke Shuto, Ryosho Nakane, Wenhong Wang, Hiroaki Sukegawa, Shuuichirou Yamamoto, Masaaki Tanaka, Koichiro Inomata, and Satoshi Sugahara
    Appl. Phys. Express 3, 013003 (2010).



    2009

    Giant Tunneling Magnetoresistance up to 330% at Room Temperature in Sputter Deposited Co2FeAl/MgO/CoFe Magnetic Tunnel Junctions
    Wenhong Wang, Hiroaki Sukegawa, Rong Shan, Seiji Mitani, and Koichiro Inomata
    Appl. Phys. Lett. 95, 182502 (2009).

    Demonstration of Half-Metallicity in Fermi-Level-Tuned Heusler Alloy Co2FeAl0.5Si0.5 at Room Temperature
    R. Shan, H. Sukegawa, W. H. Wang, M. Kodzuka, T. Furubayashi, T. Ohkubo, S. Mitani, K. Inomata, and K. Hono
    Phys. Rev. Lett. 102, 246601 (2009).

    Spin-Polarized Tunneling Spectroscopy of Fully-Epitaxial Magnetic Tunnel Junctions Using Co2FeAl0.5Si0.5 Heusler Alloy Electrodes
    Hiroaki Sukegawa, Wenhong Wang, Rong Shan, Tomoya Nakatani, Koichiro Inomata, and Kazuhiro Hono
    Phys. Rev. B 79, 184418 (2009).

    Tunnel Magnetoresistance in Full-Heusler Co2FeAl0.5Si0.5-Based Magnetic Tunnel Junctions
    H. Sukegawa, W. H. Wang, R. Shan, K. Inomata
    J. Magn. Soc. Jpn. 33, 256-261 (2009) (in Japanese).

    Structure and Spin Polarization of Outermost Surface of the Co2FeAl0.5Si0.5 Full-Heusler Alloy Studied by Spin-Polarized Ion-ScatteringSpectroscopy
    T. T. Suzuki, H. Sukegawa, and K. Inomata
    Phys. Rev. B 79, 045423 (2009).

    Current-Perpendicular-to-Plane Giant Magnetoresistance Spin Valves Using Co2MnSi Epitaxial Layers
    Kota Kodama, Takao Furubayashi, Hiroaki Sukegawa, T. M. Nakatani, Koichiro Inomata and K. Hono
    J. Appl. Phys. 105, 07E905 (2009).



    2008

    Current-Perpendicular-to-Plane Giant Magnetoresistance in Spin-Valve Structures Using Epitaxial Co2FeAl0.5Si0.5/Ag/Co2FeAl0.5Si0.5 Trilayers
    T. Furubayashi, K. Kodama, H. Sukegawa, Y. K. Takahashi, K. Inomata, and K. Hono
    Appl. Phys. Lett. 93, 122507 (2008).

    Large Tunnel Magnetoresistance in Co2FeAl0.5Si0.5/MgO/Co2FeAl0.5Si0.5 Magnetic Tunnel Junctions Prepared on Thermally Oxidized Si Substrates with MgO Buffer
    Wenhong Wang, Hiroaki Sukegawa, Rong Shan, and Koichiro Inomata
    Appl. Phys. Lett. 93, 182504 (2008).

    Fabrication of Fully Epitaxial Magnetic Tunnel Junctions Using L21-Ordered Co2FeAl0.5Si0.5 Electrodes and Their Tunneling Magnetoresistance Characteristics
    Wenhong Wang, Hiroaki Sukegawa, Rong Shan, and Koichiro Inomata
    Appl. Phys. Lett. 93, 122506 (2008).

    Preparation and Characterization of Highly L21-Ordered Full-Heusler Alloy Co2FeAl0.5Si0.5 Thin Films for Spintronics Device Applications
    Wenhong Wang, Hiroaki Sukegawa, Rong Shan, Takao Furubayashi, and Koichiro Inomata
    Appl. Phys. Lett. 92, 221912 (2008).

    Site disorder in Co2Fe(Al, Si) Heusler alloys and its influence on junction tunnel magnetoresistance
    K. Inomata, M. Wojcik, E. Jedryka, N. Ikeda and N. Tezuka
    Phys. Rev. B 77, 214425 (2008).

    Highly spin-polarized materials and devices for spintronics
    K. Inomata, N. Ikeda, N. Tezuka, R. Goto, S. Sugimoto, M. Wojcik and E. Jedryka
    Sci. Technol. Adv. Mater. 9, 014101 (2008).