Hitoshi Ohta

Doctor of Science

Professor, Molecular Photoscience Research Center, Kobe University

Address: Molecular Photoscience Research Center, Kobe University,

               1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan

Personal history

Year of Birth    1958        Place of Birth: Takarazuka, Japan

Resarch

Experimental condensed matter physics

  Development of multi-extreme THz ESR system

  High field ESR measurements of magnetic systems

  Magneto-optical measurements of organic conductors

  ESR measurements of magnetic semiconductors

Multi-extreme THz ESR: Frequency range 0.03-7 THz, Pulsed magnetic field up to 55 T, Temperature range 1.8-300 K, High pressure up to 2.1 GPa, Microcantilever ESR

9 books and 331 papers (up to June 17,2013)

Education

1982  Graduated University of Tokyo, Department of Physics, Japan

1985  MSc degree in Physics from Science University of Tokyo, Japan

1989  Doctor degree in Physics from Science University of Tokyo, Japan

1987-1994  Assistant Professor of Kobe University, Japan

1994-2001  Associate  Professor  of Kobe University, Japan

2001-      Professor of Molecular Photoscience Research Center, Kobe

           University, Japan

2003-      Vice-Director of Molecular Photoscience Research Center, Kobe

           University, Japan

1990-1991  Visiting Researcher of University of California, Santa Barbara, USA

1995       Guest Associate Professor of IMR, Tohoku University, Japan

1998       Guest Associate Professor of ISSP, University of Tokyo, Japan

2002       Visiting Researcher of LNCMP, Toulouse, France

2008       Invited Professor of LNCMP, Toulouse, France (invited by CNRS)

Memberships

A member of Japanese Physical Society

A member of The International EPR(ESR) Society (IES)

A member of The International Society of Magnetic Resonance (ISMAR)

A member of Asia-Pacific EPR/ESR Society (APES)

A member of The Society of Electron Spin Science and Technology (SEST)

A member of The Japan Society of Infrared Science and Technology

A member of The Japan Society of High Pressure Science and Technology

Awards

2008 International EPR (ESR) Society (IES) Silver Medal for Instrumentation

Social activities

2000-2003   18th Council, Science Council of Japan

2000-2001   APES Council, Representative from Japan

2001-2004   APES Council, Vice President

2004-2008   APES President

2002-2004   Editorial Board of the Indian Journal of Pure & Applied Physics

2006-       Associate Editor Asia-Pacific of IES

2002-2003    SEST Council, Journal

2004-2005     SEST Council, Secretary General

2004-2008      The Japan Society of Infrared Science and Technology Council

2006-2007      SEST Council, Former Secretary General

2006-2007  Representative of the Physical Society of Japan Osaka area

2008-2009  SEST  Vice-President

2008-2012  APES Council, Immediate Past President

2008-2009  Vice-Representative of Area 3 in the Physical Society of Japan

2009-2015  Board of the Japan Society of Infrared Science and Technology

2009-2010  Representative of Area 3 in the Physical Society of Japan

2010-2011  SEST President

2010-       Advisory Board of Applied Magnetic Resonance

2012-2014   APES Council, Vice President

2012-2014   IES Vice President Asia-Pacific

2012-2013   IES President (Acting)

2013-2015  Council of the Japan Society of Infrared Science and Technology, Secretary General

Organizations of International Conferences

Secretary General, the Local Organising Committee. the 3rd Asia-Pasific EPR/ESR Symposium (APES01), Kobe University, Oct. 29-Nov. 1, 2001

Chairman and the Proceedings Editor , Int. Workshop on Application of Submillimeter Wave Electron Spin Resonance for Novel Magnetic Systems, Sendai, June 13-14, 2002

Secretary General, the Local Organising Committee. The 28th Int. Conf. on  Infrared and Millimeter Waves (IRMMW2003), Otsu, Sept. 29-Oct. 3, 2003

The Organizing Committee. Int. Conf. on Statistical Physics of Quantum Systems, Sendai, July 17-20, 2004

International Organizing Committee, International School on EPR/ESR Spectroscopy and Free Radical Research, Mumbai, Nov. 17-20, 2004

International Organizing Committee, 4th Asia-Pasific EPR/ESR Symposium 2004 (APES04), Bangalore, Nov. 21-25, 2004

Secretary General and the Proceedings Editor, the Organising Committee. Int. Symposium on Quantum Spin Systems (QSS04), Hayama, Nov. 30-Dec. 3, 2004

Publication Committee member, the Organising Committee, (RHMF06), Sendai, Aug. 16-19, 2006

Secretary General, the Organising Committee, Highly Frustrated Magnetism (HFM06), Osaka, Aug. 15-19, 2006

International Organizing Committee, Asia-Pasific EPR/ESR Symposium 2006 (APES06), Novosibirsk, Aug. 24-27, 2006

Program Committee, IRMMW/THZ 2006 (The combined 31st International Conference on Infrared and Millimeter Waves and 14th International Conference on Terahertz Electronics), Shanghai, Sept. 18-22

Organizing committee, ISSP Workshop/COE21"QUESTS" 7th International Workshop "New Developments in ESR of Strongly Correlated Systems", Kashiwa, May 21-23, 2007

Chairperson, Molecular Photoscience Research Center International Workshop "Low Energy Excitations in Condensed Phases", Kobe University, Nov. 12-13, 2007

International Organizing Committee, Asia-Pasific EPR/ESR Symposium 2008 (APES08), Carins, July 13-18, 2008

International Advisory Committee, 9 th International Conference on Research in High magnetic Fields (RHMF09), Dresden, Germany, July 22-25, 2009

International Advisory Committee, the 34 th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2009), Busan, Korea, Sept. 21-25, 2009

Chairman, International Workshop Electron Magnetic Resonance of Strongly Correlated Spin Systems (EMRSCS2009), Kobe, Japan, Nov. 8-9, 2009

International Advisory Committee, Asia-Pacific EPR/ESR Simposium (APES2010), Jeju, Korea, Oct. 10-14, 2010

Scientific Committee, Joint FNMA'11, IMIM'11 and AUXETICS'11, Szczecin, Poland, Sept. 6-9, 2011

Program Committee, Spin Physics, Spin Chemistry and Spin Technology, Kazan, Russia, Nov. 1-5, 2011

Chairman, Int. Workshop "Advanced ESR Studies for New Frontiers in Biofunctional Spin Science and Tchnology" (AEBST2011), Kobe, Japan, Nov. 13-14, 2011

International Advisory Committee, The 10 th International Conference on Research in High magnetic Fields (RHMF2012), Wuhan, China, July 3-6, 2012

International Organization Committee of Asia-Pacific EPR/ESR Symposium (APES2012)

National Advisory Committee, The 2nd International Symposium on Electron Spin Science (ISESS2012), Matushima, Japan, July 23-25, 2012

Program Committee, Modern Development of Magnetic Resonance-2013, Kazan, Russia, Sept. 24-28, 2013

Chairperson, Joint Conference of APES2014, IES and SEST2014 (APES-IES-SEST2014) , Nara, Japan, Nov. 12-16, 2014

Very Recent Publications (After 2012)

(numbers are publications tag#)

312 Ferromagnetic Ground States with High Transition Temperatures in New Tetragonal Rare-Earth Compounds CeRu2Al2B and PrRu2Al2B

E. Matsuoka, Y. Tomiyama, H. Sugawara, T. Sakurai, and H. Ohta

J. Phys. Soc. Jpn. 81 (2012) 043704

313 Reversible iodine absorption by alkali-TCNQ salts with associated changes in physical properties

A. Funabiki, T. Mochida, K. Takahashi, H. Mori, T. Sakurai, H. Ohta and M. Uruichi

J. Mater. Chem. 22 (2012) 8361

314 Study on spin-splitting phenomena in the band structure of GdN

R. Vidyasagar, S. Kitayama, H. Yoshitomi, T. Kita, T. Sakurai, and H. Ohta

Appl. Phys. Lett. 100 (2012) 232410/1-4

315 Ferromagnetic properties of GdN thin films studied by temperature

dependent circular polarized spectroscopy

H. Yoshitomi, R. Vidyasagar, S. Kitayama, T. Kita, H. Ohta, S. Okubo, Y. Fukuoka, and T. Sakurai

Appl. Phys. Lett. 101 (2012) 072403/1-5

316 Development of high-pressure and high-field ESR system using SQUID magnetometer

T. Sakurai, K. Fujimoto, R. Goto, S. Okubo, H. Ohta, Y. Uwatoko

J. Magn. Res. 223 (2012) 41-45.

317 Vapochromic Ionic Liquids from Metal–Chelate Complexes Exhibiting Reversible Changes in Color, Thermal, and Magnetic Properties

Yusuke Funasako, Tomoyuki Mochida, Kazuyuki Takahashi, Toshihiro Sakurai, and Hitoshi Ohta

Chem. Eur. J. 18 (2012) 11929-11936.

318 Dzyaloshinsky-Moriya interaction and field-induced magnetic order in an antiferromagnetic

honeycomb lattice compound Bi3Mn4O12(NO3) studied by high-field electron spin resonance

Susumu Okubo, Tomonari Ueda, Hitoshi Ohta, Weimin Zhang, Takahiro Sakurai, Nozomi Onishi, Masaki Azuma, Yuichi Shimakawa, Hiroki Nakano, and Toˆru Sakai

Phys. Rev. B 86 (2012) 140401(R)/1-4

319 Y and Gd Substitution Effects on Magnetic Properties of SmPd3S4 and TbPd3S4

Eiichi Matsuoka, Yuta Inoue, Koki Kumauchi, Hitoshi Sugawara, Takahiro Sakurai, Hitoshi Ohta, and Hideya Onodera

J. Phys. Soc. Jpn. 81 (2012) SB038/1-4

320 Cantilever-detected high-frequency ESR measurement using a backward travelling wave oscillator

Y Tokuda, S Hirano, and E Ohmichi, H. Ohta

J. Phys. Conf. 400 (2012) 032103/1-4

321 Dzyaloshinsky-Moriya Interaction Estimated by AFMR of Kagome Like Substance Cu2O(SO4) Observed at 1.8K

Naoki Takahashi, Susumu Okubo, Hitoshi Ohta, Takahiro Sakurai, Masashi Fujisawa, Hikomitu Kikuchi

J. Phys. Conf. 400 (2012) 032097/1-4

322 Possible new temperature phase observed in GeCo2O4 spinel by high-field ESR

Tatsuya Yamasaki, Susumu Okubo, Hitoshi Ohta, Takahiro Sakurai, Shinichi Ikeda, Hiroyuki Oshima, Miwako Takahashi, Shigeo Hara, Keisuke Tomiyasu, and Tadataka Watanabe

J. Phys. Conf. 400 (2012) 032119/1-4

323 Magnetic and electric properties in the distorted tetrahedral spin chain system Cu3Mo2O9

T Hosaka, S Hachiuma, H Kuroe, T Sekine, M Hase, K Oka, T Ito, H Eisaki, M Fujisawa, S Okubo, H Ohta

J. Phys. Conf. 400 (2012) 032022/1-4

324 Design of in situ sample rotation mechanism for angle-dependent study of cantilever-detected high-frequency ESR

E. Ohmichi, S. Hirano, H. Ohta

J. Mag. Res. 227 (2013) 9-13

325 Developments of Multi-extreme High Field ESR in Kobe

H. Ohta, S. Okubo, E. Ohmichi, T. Sakurai, W.-M. Zhang, T. Shimokawa

J. Low Temp Phys 170 (2013) 511-519        (2013 January 31)

326 Tuning optical and ferromagnetic properties of thin GdN films by nitrogen-vacancy centers

Reddithota Vidyasagar, Shinya Kitayama, Hiroaki Yoshitomi, Takashi Kita, Takahiro Sakurai, and Hitoshi Ohta

Eur. Phys. J. B 86 (2013) 52/1-4

327 Magneto-optical effect in GdN epitaxial thin film

R.Vidya Sagar, H. Yoshitomi, S. Kitayama, T. Kita, H. Ohta, T. Sakurai

J. Phys.: Conf. Series 417 (2013) 012053/1-4

328 Detailed Impurity Phase Investigation by X-ray Absorption Fine Structure and Electron Spin Resonance Analyses in Synthesis of CaMgSi2O6:Eu Phosphor

Takashi Kunimoto, Tetsuo Honma, Koutoku Ohmi, Susumu Okubo, and Hitoshi Ohta

Jpn. J. Applied Phys. 52 (2013) 042402/1-7

329 Giant optical splitting in the spin-states assisting a sharp magnetic switching in GdN thin films

R. Vidyasagar,T. Kita, T. Sakurai and H. Ohta

Appl. Phys. Lett. 102 (2013) 222408

330 Development of Hybrid Type Pressure Cell for High Pressure and High field ESR Measurement

Kohdai Fujimoto, Takahiro Sakurai, Susumu Okubo, Hitoshi Ohta, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Kazutaka Kudo, Yoji Koike

To appear in Appl. Mag. Res. (2013)

331 Organometallic Ionic Liquids from Alkyloctamethylferrocenium Cations: Thermal Properties, Crystal Structures, and Magnetic Properties

Y. Funasako, T. Inagaki, T. Mochida, T. Sakurai, H. Ohta, K. Furukawa, T. Nakamura

To appear in Dalton Transactions (2013)

Invited presentations (International Conferences) 

41 (up to June 17,2013)

The list of recent invited presentations after 2008

24) H. Ohta, High Field ESR Spectroscopy using a Pulsed Magnetic Field: Application to the Material Science, Workshop on Multifrequency EPR: Applications to Complex Systems, July 13, 2008 (Cairns, Australia)

25) H. Ohta, Developments of Multi-Extreme High Frequency ESR Measurement System using a Pulsed Magnetic Field, 6th Asia-Pasific EPR/ESR Symposium (APES2008), July 13-18, 2008 (Cairns, Australia)

26) H. Ohta, M. Fujisawa, M. Yoshida, Y. Fujiwara, Electron Spin Resonance Measurement on Er, O-codoped GaAs, MRS fall meeting, Dec. 1-5, 2008 (Boston, USA)

27) H. Ohta, E. Ohmichi, S. Okubo, T. Sakurai, M. Fujisawa, Recent Advances of High Frequency High Field ESR Measurements, 11 th International Workshop on Electron Magnetic Resonance of Disordered Systems, June 11-18, 2009 (Sofia-Boyana, Bulgaria)

28) H. Ohta, E. Ohmichi, S. Okubo, T. Sakurai and M. Fujisawa, Development of Multi-Extreme High Frequency ESR Measurement System and Its Applications, The 51st Annual Rocky Mountain Conference on Analytical Chemistry, July 19-23, 2009 (Snowmass, USA)

29) H. Ohta, E. Ohmichi, S. Okubo, T. Sakurai, M. Fujisawa, Development of Multi-Extreme High-Frequency EMR Measurement System in Kobe, Electron Magnetic Resonance of Strongly Correlated Spin Systems (EMRSCS2009), Nov. 8-9, 2009 (Kobe, Japan)

30) H. Ohta, W-M Zhang, S. Okubo, M. Fujisawa, T. Sakurai, Y. Okamoto, H. Yoshida, Z. Hiroi, Spin Liquid State Observed in S=1/2 Kagome Lattice Antiferromagnet BaCu3V2O8(OH)2 by High-Field ESR, Magnetic Resonance in Highly Frustrated Magnetic Systems (HFMR2010), Feb. 1-4, 2010 (Kranjska Gora, Slovenia)

31) H. Ohta, E. Ohmichi, S. Hirano, and N. Mizuno, Development of THz ESR Systems Using a Micro-Cantilever, International Workshop on Terahertz Spectroscopy and Its High-Field Applications, June 14-15, 2010 (FZD, Dresden, Germany)

32) H. Ohta, Developments and Applications of Multi-Extreme THz ESR System, Joint EUROMAR 2010 and 17th ISMAR Conference (WWMR2010), July 4-9, 2010 (Florence, Italy) Plenary

33) H. Ohta, Development of Multi-Extreme High Frequency ESR and Its Application to Quantum Spin System, 7th Asia-Pacific EPR/ESR Symposium (APES2010), Oct. 10-14, 2010 (Jeju, Republic of Korea)　 Plenary

34) H. Ohta, Development of Multi-Extreme THz ESR and Its Application to Quantum Spin System, 28th Physics Congress, Oct. 25-27, 2010 (Antipolo City, Phillipine) Plenary

35) H. Ohta, S. Okubo, T. Kobayashi, T. Sakurai, E. Ohmichi, A. Matsuo, K. Kindo, X.G. Zheng, S. Nishihara, M. Fujisawa, H. Kikuchi, Observation of Terahertz Gap in CuO by High Field ESR, 2nd Int. Workshop on Frontier Science in Pulsed High Magnetic Fields, April 20-22, 2011  (Wuhan High Magnetic Field Center, Huazhong University of Science & Technology, Wuhan, China)

36) H. Ohta, S. Okubo, E. Ohmichi, T. Sakurai, Developments of Multi-Extreme Terahertz ESR System at Low Temperature, 26th International Conference on Low Temperature Physics (LT26), Aug. 10-17, (Beijing, China)

37) H. Ohta, S. Okubo, E. Ohmichi, T. Sakurai, Recent developments of muti-extreme terahertz EMR in Kobe, Functional and Nanostructured Materials (FNMA’11) & Intermolecular and Magnetic Interactions in Matter (IMIM’11), Sept. 6-9, 2011 (Szczecin, Poland)

38) H. Ohta S. Okubo, T. Kobayashi, T. Sakurai, A. Matsuo, K. Kindo, X.G. Zheng, S. Nishihara, M. Fujisawa, H. Kikuchi, Application of THz High-Field EMR –Observation of  THz Spin Gaps and Possible Application to Biological Systems, Spin Physics, Spin Chemistry and Spin Technology, Nov.1-4, 2011, (Kazan, Russia)

39) H. Ohta, S. Okubo, T. Kobayashi, T. Sakurai, W. Zhang, C. Yokoyama, X.G. Zheng, S. Nishihara, K. Inoue, M. Fujisawa, H. Kikuchi, E. Matsuoka, H. Sugawara, THz ESR Study of Multiferroic Material CuO Under Pulsed Magnetic Field, IRMMW-THz 2012, Sept. 23-28, 2012 (Wollongong, Australia)

40) Hitoshi Ohta, Susumu Okubo, Eiji Ohmichi, Takahiro Sakurai, Wei-min Zhang, and Tokuro Shimokawa, Developments and Applications of Multi-Extreme THz ESR, International Conference “Modern Development of Magnetic Resonance”, Sept. 25-30, 2012 (Kazan, Russia)　

41) Hitoshi Ohta, Susumu Okubo, Eiji Ohmichi, Takahiro Sakurai, Wei-min Zhang, and Tokuro Shimokawa, Development of Multi-Extreme THz ESR and Its Applications to Magnetic Systems, 8th Asia-Pacific EPR/ESR Symposium (APES2012), Oct. 11-15, 2012 (Beijing, China)

Seminars

1) H. Ohta, Application of high frequency high filed ESR using the pulsed magnetic field up to 55T, Seminar at HLD, Oct. 1, 2007 (Dresden High Magnetic field Laboratory, Dresden, Germany)

2) H. Ohta, Quantum spin systems studied by high frequency high field ESR, Oct. 2, 2007 (Leibniz Institute for Solid State and Materials Research IFW, Dresden, Germany)

3) H. Ohta, Recent Advances of High Frequency High Field ESR and Its Applications to Azurite, Oct. 21, 2008 (Grenoble High Magnetic Field Laboratory, Grenoble, France)

4) H. Ohta, Recent Developments of High Frequency High Field ESR in Kobe, Oct. 23, 2008 (LNCMP, Toulouse, France)

5) H. Ohta, Recent Advance of Highly Sensitive Cantilever High Frequency Electron Spin Resonance, Condensed Matter Physics Seminar, Feb. 5, 2010 (Institute Jozef Stefan, Ljubljana, Slovenia)

6) H. Ohta, Developments of multi-extreme high field ESR and its applications to quantum spin systems, Oct. 7, 2010 (Wuhan High Magnetic Field Center, Huazhong University of Science & Technology, Wuhan, China)

7) H. Ohta, Development of the high-field ESR facility at Kobe University, Feb. 21, 2012 (Dresden High Magnetic Field Laboratory (HLD), Dresden, Germany)

8) H. Ohta, Multi extreme THz ESR and its applications to honeycomb lattice antiferromagnets, Feb. 22, 2012 (Multi extreme THz ESR and its applications to honeycomb lattice antiferromagnets)