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Faculty of Engineering Department of Electrical and Electronic Engineering

Faculty Introduction

Teacher Profiles

DOI, Masaaki Professor (Spin Electronics)

DOI, Masaaki Professor

degree Ph.D. (Engineering)
Specialty Magnetic thin film engineering, spin electronics
Affiliated academic societies The Magnetics Society of Japan, The Japan Society of Applied Physics, The Japan Institute of Metals, The Physical Society of Japan
others Hobbies, etc.: Traveling
Subjects Taught Fundamentals of Electronics Engineering, Electromagnetism I, Exercises in Electromagnetism I, Electrical and Electronic Materials Engineering, Solid State Device Engineering II, Electronics Engineering Experiments III & IV, Electronics Engineering Seminar, Graduation Research I & II (Graduate Schools: Advanced Topics in Applied Magnetic Engineering)
Website Under construction
Research topic

Research on spin-torque microwave oscillation, research on nano-constricted electronic devices,
Research on novel spin-electronic devices, and research on the analysis of the ultrafine magnetic structure of magnetic materials using the Mössbauer effect.

Career
March 1980 (Showa 55) Graduated from Hokkaido Prefectural Sapporo Kita High School
March 1986 (Showa 61) Graduated from the Department of Iron and Steel Engineering, Faculty of Engineering Nagoya University.
March 1988 (Showa 63) Master's Program, Graduate Graduate School of Engineering Nagoya Graduate Schools
Completed a degree in Metallurgical Engineering and Steel Engineering.
March 1991 (Heisei 3) Doctoral Program, Graduate Graduate School of Engineering Nagoya Graduate Schools
Completed a major in Metallurgical Engineering and Steel Engineering.
April 1991 (Heisei 3) Assistant Professor, Department of Materials Science and Engineering, Faculty of Engineering, Nagoya University
October 1998 (Heisei 10) Nagoya University VBL Overseas Researcher
(Department of Applied Physics, University of Duisburg, Germany) (6 months)
April 2000 (Heisei 12) Visiting Researcher at the University of Duisburg (Germany) (One year)
April 2003 (Heisei 15) Associate Professor, Graduate School of Engineering, Tohoku Graduate Schools
April 2007 (Heisei 19) Associate Professor Graduate School of Engineering, Tohoku Graduate Schools
April 2011 (Heisei 23) Professor, Department of Electronic Engineering, Faculty of Engineering Tohoku Gakuin University
performance
Academic paper
  • Spin-transfer induced microwave oscillation in spin valves with ferromagnetic nano-contacts in oxide spacer layer M. Doi, H. Endo, K. Shirafuji, S. Kawasaki, M. Sahashi, HN Fuke, H. Iwasaki and H. Imamura J. Phys. D, Fast Track Communication, 44 (2011) 092001.
  • Feature of Current-Induced Microwave Oscillation in Nano-contacts Magnetoresistive Devices after High-Temperature-Annealing T.Nakamura,H.Suzuki, H.Endo, T.Tanaka, M.Doi, S.Hashimoto, HNFuke, M.Takagishi, H.Iwasaki, and M.Sahashi IEEE TRANSACTIONS ON MAGNETICS, Vol.46, (2010) 2212-2215.
  • Characteristics of microwave oscillation in NCMR devices using Fe/AlOx-NOL. Toshiyuki Tanaka, Hiroaki Endo, Masaaki Doi, Hiromi Fukuya, Hitoshi Iwasaki, Masashi Sahashi. Journal of the Magnetics Society of Japan, 34 (2010), 297-300.
  • Anomalous temperature dependence of training effect in specular spin valve using ultrathin Cr2O3-nano-oxide layer with magnetoelectric effect K. Sawada, N. Shimomura, M. Doi, and M. Sahashi JOURNAL OF APPLIED PHYSICS, 107 (2010) , 09D713.
  • Feature of Current-Induced Microwave Oscillation in Nano-contacts Magnetoresistive Devices after High-Temperature-Annealing T. Nakamura, H. Suzuki, Y. Okutomi, M. Doi, HN Fuke, H. Iwasaki, and M. Sahashi IEEE TRANSACTIONS ON MAGNETICS, Vol.46, (2010), 2212-2215.
  • Magnetic SiO2 gel microspheres for arterial embolization hyperthermia. Z. Li, M. Kawashita, N. Araki, M. Mitsumori, M. Hiraoka, M. Doi J. Materials Chemistry, (2010), in press.
  • Preparation of Magnetic Iron Oxide Nanoparticles for Hyperthermia of Cancer in a FeCl2-NaNO3-NaOH Aqueous System Z. Li, M. Kawashita, N. Araki, M. Mitsumori, M. Hiraoka, M. Doi J. Biomaterials Applications, (2010) in press.
  • Magnetite nanoparticles with high heating efficiencies for application in the hyperthermia of cancer. Z. Li, M. Kawashita, N. Araki, M. Mitsumori, M. Hiraoka, M. Doi Materials Science and Engineering C, (2010) in press.
  • Sol-gel synthesis and characterization of magnetic TiO2 microspheres. Z. Li, M. Kawashita, and M. Doi J. Ceramic Society of Japan, 118 (2010) , 464-473.
  • Synthesis of submicron sized Fe20Ni80 particles and their magnetic properties. D. Komada, K. Shinoda, R. Kasuya, K. Tohji, M. Doi, and J. Balachandran JOURNAL OF APPLIED PHYSICS, 107 (2010) , 09A320
  • Characteristics of microwave oscillations induced by spin-transfer-torque in a ferromagnetic nanocontact magnetoresistive element H.Suzuki, H.Endo, T.Nakamura, T.Tanaka, M.Doi, S.Hashimoto, HNFuke, M.Takagishi, H.Iwasaki, and M.Sahashi JOURNAL OF APPLIED PHYSICS, 105, 07D124 (2009).
  • Interlayer coupling through Cu spacer and its unique temperature dependency in spin valve films with Co1-xFex/Cr-NOL K. Sawada, H. Endo, M. Doi, and M. Sahashi IEEE TRANSACTION ON MAGNETICS, 45, 4019 (2009)
  • High Level Oscillations with Narrow Line widthin Magnetic Nano-Contact Spin Torque Oscillator with Synthetic AF Spin-Valve Structure Hiroaki Endo, Toshiyuki Tanaka, Masaaki Doi, Susumu Hashimoto, Hiromi Niu Fuke, Hitoshi Iwasaki, Masashi Sahashi IEEE TRANSACTION ON MAGNETICS, 45, 3418 (2009).
  • High bulk spin scattering asymmetry in CPP spin valves with alternated monatomic [Fe/Co]n superlattices. Tomonori Mano, In Chang Chu, Kousaku Miyake, Masaaki Doi, Satoko Kuwano, Toshiyuki Shima, Masashi Sahashi. IEEE TRANSACTION ON MAGNETICS 45, 3460 (2009).
  • 15. Structural properties of alternate monatomic layered [Fe/Co]n epitaxial films on MgO substrate In Chang Chu, Yoshinobu Saki, Shohei Kawasaki, Masaaki Doi, and Masashi Sahashi Jpn. JOURNAL OF APPLIED PHYSICS, 47, No.6 (2008), 4511.
  • Effect of sense current on the RH curve of a DWMR element and microwave oscillation. Kazushige Shirafuji, Hiroaki Endo, Hiroaki Suzuki, Masaaki Doi, Masashi Sahashi. Journal of the Magnetics Society of Japan, 32 (2008), 515-518.
  • Magnetic coupling of spin valve thin films containing nanostructured magnetic oxide layers. Kazuya Sawada, Hiroaki Endo, Masaaki Doi, Naoya Hasegawa, Masashi Sahashi. Journal of the Magnetics Society of Japan, 32 (2008), 509-514.
  • Research on the formation of ferromagnetic metal nanocontacts in Co0.9Fe0.1-AlOx NOL. Yohei Shiokawa, Shohei Kawasaki, Tomonori Mano, Ryo Shiozaki, Masaaki Doi, Masashi Sahashi. Journal of the Magnetics Society of Japan, 32 (2008), 205-210.
  • Epitaxial growth, magnetic properties, and lattice dynamics of Fe nanoclusters on GaAs(001) B. Roldan Cuenya, A. Naitabdi, E. Schuster, R. Peters, M. Doi, W. Keune Phys. Rev. B, 76 (2007) , 094403.
  • 20. Confirmation of “Atom Pumping-up Mechanism” in Fe/Ta Film for the Fabrication of Ferromagnetic Nano-bridge M. Doi, Y. Abe, K. Miyake, HN Fuke, M. Takagishi, H. Iwasaki, M. Sahashi IEEE TRANSACTION ON MAGNETICS, Vol.43, 2851 (2007).
  • Exchange Bias Characteristics in Specular Spin Valve System with Emedded (Co-Fe)/Cr Nano-Oxide Layer in Pinned Ferromagnetic Layer M. Sahashi, K. Sawada, H. Endo, M. Doi, and N. Hasegawa IEEE TRANSACTION ON MAGNETICS, Vol.43, 3668 (2007).
Invited lecture
  • Spin Torque Microwave Oscillation on Spin-valve Elements with Ferromagnetic Nano-contacts M. Doi, H. Suzuki, H. Endo, T. Nakamura, T. Tanaka, HN Fuke, S. Hashimoto, H. Iwasaki, and M.Sahashi ISAMMA 2010, Sendai, Japan ,July 15(2010)
Books and Commentaries
  • "Recent Research on Nano-Constricted Magnetoresistance Effects," Magneto 2, 510 (2007), Co-authored.
  • "Fundamentals of Spintronics and the Cutting Edge of Materials and Applied Technologies," CMC Publishing, supervised by Hiroki Takanashi, co-authored.
patent
  • "Micro-oscillating elements and detection elements" October 14, 2008
  • "Magnetoresistive element, magnetic head, and magnetic recording/reproducing device" September 24, 2008
  • "Micro-oscillating element and detection element" October 31, 2007
  • "Magnetoresistive element, method for manufacturing the same, and magnetic head, magnetic regeneration device, and magnetic memory using the same" January 11, 2006

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