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大阪大学大学院基礎工学研究科システム創成専攻電子光科学領域 浜屋研究室
〒560-8531 大阪府豊中市待兼山町1-3 E303-05
研究成果:
論文・プロシーディング

-2017年-

M. Kawano, M. Ikawa, K. Santo, S. Sakai, H. Sato, S. Yamada, and K. Hamaya:
“Electrical detection of spin accumulation and relaxation in p-type germanium”
Phys. Rev. Mater. 1, 034604 (2017).


M. Yamada, Y. Fujita, M. Tsukahara, S. Yamada, K. Sawano, and K. Hamaya:
"Large impact of impurity concentration on spin transport in degenerate n-Ge"

Phys. Rev. B 95, 161304(R) (2017). (Rapid Communications).

Y. Fujita, M. Yamada, M. Tsukahara, T. Oka, S. Yamada, T. Kanashima, K. Sawano, and K. Hamaya:
"Spin Transport and Relaxation up to 250 K in Heavily Doped n-Ge Detected Using Co2FeAl0.5Si0.5 Electrodes"

Phys. Rev. Appl. 8, 014007 (2017).

A. Spiesser, H. Saito, Y. Fujita, S. Yamada, K. Hamaya, S. Yuasa, R. Jansen:
"Giant Spin Accumulation in Silicon Nonlocal Spin-Transport Devices"
Phys. Rev. Appl. (accepted).

M. Ishikawa, T. Oka, Y. Fujita, H. Sugiyama, Y. Saito, and K. Hamaya:
"Spin relaxation through lateral spin transport in heavily doped n-type silicon"

Phys. Rev. B 95, 115302 (2017).

H. Higashi, M. Nakano, K. Kudo, Y. Fujita, S. Yamada, T. Kanashima, I.Tsunoda, H. Nakashima, and K. Hamaya:
"A crystalline germanium flexible thin-film transistor"
Appl. Phys. Lett. (accepted).

S. Yamada, K. Kudo, R. Okuhata, J. Chikada, Y. Nakamura, and K. Hamaya:
Low thermal conductivity of thermoelectric Fe2VAl films
Appl. Phys. Express 10, 115802 (2017).

M. Yamada, M. Tsukahara, Y. Fujita, T. Naito, S. Yamada, K. Sawano, and K. Hamaya:
"Room-temperature spin transport in n-Ge probed by four-terminal nonlocal measurements"
Appl. Phys. Express 10, 093001 (2017) (Spotlights).


T. Kanashima, R. Yamashiro, M. Zenitaka, K. Yamamoto, D. Wang, J. Tadano, S. Yamada, H. Nohira, H. Nakashima, and K. Hamaya:
"Electrical properties of epitaxial Lu- or Y-doped La2O3/La2O3/Ge high-k gate-stacks"

Materials Science in Semiconductor Processing 70, 260-264 (2017).

M. Yamada, Y. Fujita, S. Yamada, T. Kanashima, K. Sawano, and K. Hamaya:
"Control of electrical properties in Heusler-alloy/Ge Schottky tunnel contacts by using phosphorous δ-doping with Si-layer insertion"

Materials Science in Semiconductor Processing 70, 83-85 (2017).

K. Kasahara, H. Higashi, M. Nakano, Y. Nagatomi, K. Yamamoto, H. Nakashima, and K. Hamaya:
"Effect of post annealing on electrical properties of pseudo-single-crystalline germanium films fabricated on glass substrates"

Materials Science in Semiconductor Processing 70, 68-72 (2017).

S. Sakai, M. Kawano, M. Ikawa, H. Sato, S. Yamada, and K. Hamaya:
"Low-temperature growth of fully epitaxial CoFe/Ge/Fe3Si layers on Si for vertical-type semiconductor spintronic devices"
Semicond. Sci. Technol 32, 094005 (2017).

M. Ikawa, M. Kawano, S. Sakai, S. Yamada, T. Kanashima, and K. Hamaya:
"Influence of the Ge diffusion on the magnetic and structual properties in Fe3Si and CoFe epilayers grown on Ge"

J. Cryst. Growth 468, 676-679 (2017).


S. Oki, T. Kurokawa, S. Honda, S. Yamada, T. Kanashima, H. Itoh, and K. Hamaya:
"Robust spin-current injection in lateral spin valves with two-terminal Co2FeSi spin injectors"
AIP Advances 7, 055808 (2017).


-2016年-

Z. Nedelkoski, B. Kuerbanjiang, S. E. Glover, A. Sanchez, D. Kepaptsoglou, A. Ghasemi, C. W. Burrows, S. Yamada, K. Hamaya, Q. Ramasse, P. Hasnip, T. Hase, G. Bell, A. Hirohata, and V. Lazarov:
"Realisation of magnetically and atomically abrupt harlfmetal/semiconductor interfaces:Co2FeAl0.5Si0.5/Ge(111)"
Scientific Reports 6, 37282 (2016).


K. Hamaya, T. Kurokawa, S. Oki, S. Yamada, T. Kanashima, and T. Taniyama:
"Direct evidence for suppression of the Kondo effect due to pure spin current"
Phys. Rev. B 94, 140401(R) (2016). (Rapid Communications)


Y. Fujita, M. Yamada, S. Yamada, T. Kanashima, K. Sawano, and K. Hamaya:
"Temperature independent spin relaxation in heavily doped n-type germanium"
Phys. Rev. B 94, 245302 (2016).


S. Yamada, S. Honda, J. Hirayama, M. Kawano, K. Santo, K. Tanikawa, T. Kanashima, H. Itoh, and K. Hamaya:
"Magnetic properties and interfacial characteristics of all-epitaxial Heusler-compound stacking structures"
Phys. Rev. B 94, 094435 (2016).


M. Kawano, K. Santo, M. Ikawa, S. Yamada, T. Kanashima, and K. Hamaya:
"Spin transport in p-Ge through a vertically stacked Ge/Fe3Si junction"
Appl. Phys. Lett. 109, 022406 (2016).


B. Kuerbanjiang, Z. Nedelkoski, D. Kepaptsoglou, A. Ghasemi, S. E. Glover, S. Yamada, T. Saerbeck, Q. M. Ramasse, P. J. Hasnip, T. P. Anslem Hase, G. R. Bell, K. Hamaya, A. Hirohata, and V. K. Lazarov:
"The role of chemical structure on the magnetic and electronic properties of Co2FeAl0.5Si0.5/Si(111) interface"
Appl. Phys. Lett. 108, 172412 (2016).


Z. Nedelkoski, A. M. Sanchez, A. Ghasemi, K. Hamaya, R. F. L. Evans, G. R. Bell, A. Hirohata, and V. K. Lazarov:
"The antiphase boundary in half-metallic Heusler alloy Co2Fe(Al,Si): atomic structure, spin polarization reversal and domain wall effects"
Appl. Phys. Lett. 109, 222405 (2016).


T. Yamaguchi, R. Moriya, S. Oki, S. Yamada, S. Masubuchi, K. Hamaya, and T. Machida:
"Spin injection into multilayer graphene from highly spin-polarized Co2FeSi Heusler alloy"
Appl. Phys. Express 9, 063006 (2016).


Z. Nedelkoski, D. Kepaptsoglou, A. Ghasemi, B. Kuerbanjiang, P. J. Hasnip, S. Yamada, K. Hamaya, Q. M. Ramasse, A. Hirohata, and V. K. Lazarov:
"Controlling the half-metallicity of Heusler/Si(111) interfaces by a monolayer of Si-Co-Si"

J. Phys: Conden. Mater. 28, 395003 (2016).


M. Kawano, M. Ikawa, K. Arima, S. Yamada, T. Kanashima, and K. Hamaya:
"All-epitaxial Co2FeSi/Ge/Co2FeSi trilayers fabricated by Sn-induced low-temperature epitaxy"
J. Appl. Phys. 119, 045302 (2016).


K. Sawano, Y. Hoshi, S. Kubo, K. Arimoto, J. Yamanaka, K. Nakagawa, K. Hamaya, M. Miyao, and Y. Shiraki:
"Structual and electrical properties of Ge(111) films grown on Si(111) substrates and application to Ge(111)-on-insulator"
Thin Solid Films 613, 24-28 (2016)


S. Yamada, K. Tanikawa, J. Hirayama, T. Kanashima, T. Taniyama, and K. Hamaya:
"Exchange coupling in metallic multilayers with a top FeRh layer"
AIP advances 6, 056115 (2016).
.

Y. Fujita, M. Yamada, Y. Nagatomi, K. Yamamoto, S. Yamada, K. Sawano, T. Kanashima, H. Nakashima, and K. Hamaya:
"A low-temperature fabricated gate-stack structure for Ge-based MOSFET with ferromagnetic epitaxial Heusler-alloy/Ge electrodes"
Jpn. J. Appl. Phys. 55, 063001 (2016).


K. Hamaya, M. Kawano, Y. Fujita, S. Oki, and S. Yamada:
"Finely Controlled Approaches to Formation of Heusler-Alloy/Semiconductor Heterostructures for Spintronics"
Mater. Trans. 57(6), 760-766 (2016).


K. Hamaya, S. Yamada, K. Kasahara, and T. Kanashima:
"Finely controlled heterointerfaces between Ge(111) and metallic alloys or insulators for next generation Ge-based devices"
ECS Trans. 75(8), 651-659 (2016).


-2015年-

S. Yamada, K. Tanikawa, J. Hirayama, T. Kanashima, T. Taniyama, and K. Hamaya:
"Low-temperature B2 ordering and magnetic properties of Fe100-xRhx films on bcc alloys"
Phys. Rev. B 92, 094416 (2015).


K. Kasahara, Y. Nagatomi, K. Yamamoto, H. Higashi, M. Nakano, S. Yamada, D. Wang, H. Nakashima, and K. Hamaya:
"Electrical properties of pseudo-single-crystalline germanium thin-film-transistors fabricated on glass substrates"
Appl. Phys. Lett. 107, 142102 (2015).


M. Ishikawa, H. Sugiyama, T. Inokuchi, K. Hamaya and Y. Saito:
"Spin transport and accumulation in n+-Si using Heusler compound Co2FeSi/MgO tunnel contacts"
Appl. Phys. Lett. 107, 092402 (2015).


H. Higashi, K. Kasahara, K. Kudo, H. Okamoto, K. Moto, J. -H Park, S. Yamada, T. Kanashima, M. Miyao,
I. Tsunoda and K. Hamaya:
"A pseudo-single-crystalline germanium film for flexible electronics"
Appl. Phys. Lett. 106, 041902 (2015).

Kento Yamasaki, Soichiro Oki, Shinya Yamada, Takeshi Kanashima, and Kohei Hamaya:
"Spin-related thermoelectric conversion in lateral spin-valve devices with single-crystalline Co2FeSi electrodes"
Appl. Phys. Express 8, 043003 (2015).

T. Kanashima, H. Nohira, M. Zenitaka, Y. Kajihara, S. Yamada, and K. Hamaya:
"Effect of atomic-arrangement matching on La2O3/Ge heterostructures for epitaxial high-k-gate-stacks"
J. Appl. Phys. 118, 225302 (2015).


Y. Saito, M. Ishikawa, H. Sugiyama, T. Inokuchi, K. Hamaya and N. Tezuka:
"Correlation between amplitude of spin accumulation signals investigated by Hanle effect measurement and effective junction barrier height in CoFe/MgO/n+-Si junctions"
J. Appl. Phys. 117, 17C707 (2015).


-2014年-

S. Yamada, K. Tanikawa, S. Oki, M. Kawano, M. Miyao and K. Hamaya:
"Improvement of magnetic and structural stabilities in high-quality Co2FeSi1-xAlx/Si heterointerfaces"
Appl. Phys. Lett. 105, 071601 (2014).


K. Kasahara, S. Yamada, T. Sakurai, K. Sawano, H. Nohira, M. Miyao and K. Hamaya:
"Reliable reduction of Fermi-level pinning at atomically matched metal/Ge interfaces by sulfer treatment"
Appl. Phys. Lett. 104, 172109 (2014).


J. -H Park, K. Kasahara, K. Hamaya, M. Miyao and T. Sadoh:
"High carrier mobility in orientation-controlled large-grain Ge directly formed on flexible plastic by nucleation-controlled gold-induced-crystallization"
Appl. Phys. Lett. 104, 252110 (2014)


Y. Kasatani, S. Yamada, H. Itoh, M. Miyao, K. Hamaya and Y. Nozaki:
"Large anisotropy of Gilbert damping constant in L21-ordered Co2FeSi films"
Appl. Phys. Express 7, 123001 (2014).

K. Kasahara, Y. Fujita, S. Yamada, K. Sawano, M. Miyao and K. Hamaya:
"Greatly enhanced generation efficiency of pure spin currents in Ge using Heusler compound Co2FeSi electrodes"
Appl. Phys. Express 7, 033002 (2014).

Y. Saito, M. Ishikawa, T. Tanamoto, H. Sugiyama, T. Inokuchi, K. Hamaya and N. Tezuka:
"Local magnetoresistance through Si and its bias voltage in ferromagnet/MgO/SOI lateral spin valves"
J. Appl. Phys. 115, 17C514 (2014).

K. Hamaya, G. Takemoto, Y. Baba, K. Kasahara, S. Yamada, K. Sawano and M. Miyao:
"Room-temperature electrical creation of spin accumulation in n-Ge using highly resistive Fe3Si/n+-Ge Schottky tunnel contacts"
Thin Solid Films 557, 382-385 (2014).


K. Tanikawa, S. Oki, S. Yamada, M. Kawano, M. Miyao and K. Hamaya:
"High-quality Co2FeSi0.5Al0.5/Si heterostructures for spin injection in silicon spintronic devices"
Thin Solid Films 557, 390-393 (2014).

Y. Fujita, S. Yamada, Y. Maeda, M. Miyao and K. Hamaya:
"A magnetic tunnel junction with an L21-ordered Co2FeSi electrode formed by all room-temperature fabrication processes"
Thin Solid Films 557, 386-389 (2014).

K. Sawano, Y. Hoshi, S. Endo, T. Nagashima, K. Arimoto, J. Yamanaka, K. Nakagawa, S. Yamada, K. Hamaya, M. Miyao and Y. Shiraki:
"Formation of Ge(111) on insulator by Ge epitaxy on Si(111) and layer transfer"
Thin Solid Films 557, 76-79 (2014).


K. Hamaya:
"Germanium Spintronics with Highly Spin-polarized Electrodes"
Workshop Digest of 2014 Asia-Pacific Workshop on Fundamentals and Applications of Advanced Semiconductor Devices, 40-43 (2014).


J. Hirayama, K. Tanikawa, M. Kawano, S. Yamada, M. Miyao, and K. Hamaya:
"An all epitaxial Fe3Si/FeSi/Co2FeSi trilayer grown by room-temperature molecular beam epitaxy"
IEEE Trans. Magn. 50, 11 (2014).

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