Updated on 2025/03/27

写真a

 
Konishi Kensuke
 
Organization
Graduate School of Science and Engineering (Science) Major of Science and Engineering Physics Associate Professor
Title
Associate Professor
Contact information
メールアドレス
External link

Degree

  • Doctor (Engineering) ( Kyushu University )

Research Interests

  • magnetic propaties of oxide nano particles

  • solid state physics

Research Areas

  • Nanotechnology/Materials / Nanostructural physics  / nano magnets

  • Natural Science / Magnetism, superconductivity and strongly correlated systems  / magnetism

Education

  • Kyushu University   Faculty of Engineering   Department of Applied Physics

    1989.4 - 1993.4

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    Country： Japan

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  • Kyushu University   Faculty of Engineering   Department of Applied Physics

    1987.4 - 1989.3

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    Country： Japan

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  • Tokyo University of Science   Faculty of Science and Engineering   Department of Physics

    1982.4 - 1987.3

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    Country： Japan

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Research History

  • Ehime University   Graduate School of Science and Engineering, Department of Mathematics, Physics, and Earth Sciences   Associate Professor

    2007.4

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  • Ehime University   Graduate School of Science and Engineering, Department of Mathematics, Physics, and Earth Sciences Department of Mathematics, Physics, and Earth Sciences,   Assistant professor

    2006.4 - 2007.3

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  • Ehime University   Faculty of Science, Department of Physics   Assistant professor

    2003.1 - 2006.3

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  • Ehime University   Faculty of Science, Department of Physics   Research Associate

    1994.4 - 2002.12

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Professional Memberships

Papers

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MISC

  • EXAFS Studies on Nanopartic!ulate Ferrite Hollow Spheres

    Kensuke KONISHI, Makio KURISU, Tatsuo KAMIMORI, Koichi HIRAOKA, Ikuo NAKAI

    Photon Factory Activity Report   31 ( part B )   470   2014

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    Language：English   Publishing type：Internal/External technical report, pre-print, etc.  

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  • Magnetic and electric properties of mechanically alloyed skutterudites Yb(Fe_<1-x>Co_x)_4Sb_<12>

    Hoshide H., Hiraoka K., Kurisu M., Kamimori T., Konishi K.

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   452 - 452   2013.8

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

    CiNii Books

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  • Yb Valence Instability in Yb Compounds Studied by Yb-LIII XANES

    Maskio Kirisu, Kensuke Konishi, Tatsuo Kamimori, Koichi Hiraoka, Ikuo Nakai

    Photon Factory Activity Report210   28 ( part B )   159   2012

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    Language：English   Publishing type：Internal/External technical report, pre-print, etc.  

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  • 25aPS-2 Magnetic Properties of NiFe_2O_4 Nano-Hollow Sphere

    Sakurai T., Kawabata K., Hamada N., Miyata M., Konishi K.

    Meeting abstracts of the Physical Society of Japan   65 ( 2 )   398 - 398   2010.8

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

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  • 19pXF-13 Analysis of structures in liquid state of SnI_4 under high pressures

    Konishi K., Asano Y., Hase T., Fuchizaki K., Hamaya N., Matsuura F., Katayama Y., Kikegawa T., Funakoshi K.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   788 - 788   2007.2

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

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  • Development of Ferrite Materials for Local Cauterization of Cancer

    青野宏通, 平沢英之, 矢野潤, 猶原隆, 前原常弘, 小西健介, 渡部祐司

    愛媛大学工学部工学ジャーナル   3   59 - 64   2004.3

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher：Ehime University  

    Selection of ferrite powder and suitable frequency were carried out to realize a thermal coagulation technique in which tumors are locally heated to 60-80℃ by an application of alternating magnetic field from external coils after they are stuffed with ferrite powder. Various ferrite powders were heated by an alternating magnetic field in 80kHz-399kHz. In this frequency range, the largest increase in temperature (ΔT) was obtained for the MgFe_2O_4 in all the samples examined. The ΔT value was almost proportional to the applied power and the weight of the powder. The heating ability for the Mg-ferrite was ca. 86 J・min^<-1>・g^<-1> under AC magnetic field (200W, 370kHz).

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  • Magnetic Propaties of Random Mixture Fe<sub>1-x</sub>Mn<sub>x</sub>Cl<sub>2</sub>・2H<sub>2</sub>O with Competing Exchange Interactions and Anisotropies

    ZENMYO Kazuko, TAKAI Youichi, DEGUCHI Hiroyuki, KONISHI Kensuke, TAKEDA Kazuyoshi

    Research bulletin of Fukuoka Institute of Technology   30 ( 2 )   187 - 196   1998.3

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)  

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  • Pressure Effects on Intermolecular Interactions in a Genuine Organic Ferromagnet

    TAKEDA Kazuyoshi, KONISHI Kensuke, KAWAE Tatsuya

    Technology reports of Kyushu University   67 ( 5 )   469 - 476   1994.9

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher：Kyushu University  

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  • A Study of Partially Disordered Spins in Long-Period Commensurate Spin Structures by Nuclear and Electronic Specific Heat Measurements.

    竹田和義, 小西健介, 出口博之, 繁岡透

    九州大学工学集報   65 ( 3 )   167 - 174   1992.6

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher：Kyushu University  

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  • Adiabatic Magnetization of Long-Period Commensurate Structures with Partially Disordered Spins.

    竹田和義, 出口博之, 小西健介, 繁岡透

    九州大学工学集報   65 ( 3 )   175 - 180   1992.6

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher：Kyushu University  

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  • Semiquantum liquid state of helium in one-dimensional channel at low temperatures.

    小西健介, 出口博之, 竹田和義, 瓜生典清

    九州大学工学集報   62 ( 6 )   637 - 643   1989.12

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)  

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Industrial property rights

  • 加熱方法及びそのための加熱装置

    前原 常弘, 小西 健介

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    Applicant：前原 常弘, 小西 健介

    Application no：特願2003-273219  Date applied：2003.7

    Announcement no：特開2004-089704  Date announced：2004.3

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Research Projects

  • Novel edge effects on two-dimensional quantum antiferromagnetic nanoparticles

    2014.4 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    DEGUCHI Hiroyuki, KONISHI Kensuke

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    Grant amount：\4940000 （ Direct Cost: \3800000 、 Indirect Cost：\1140000 ）

    La2CuO4 is known as a parent compound of the high-Tc cuprates and also as the S=1/2 two-dimensional quantum spin system. Recently, effects of free edges in the two-dimensional S=1/2 Heisenberg antiferromagnet were studied using quantum Monte Carlo simulations. We synthesized the La2CuO4 nanoparticles in the pores of mesoporous silica and investigated their size and edge effects through magnetic and ESR measurements. The magnetization for the La2CuO4 nanoparticles was measured. The magnetization curve was able to reproduce well by Brillouin function with S=1/2 and g=6.2. The ESR derivative absorption spectra for the nanoparticles was measured. The observed ESR spectra were reproduced by the summation of four Lorenzian absorption lines. The obtained g value of the main line was about 6, which was not observed in the La2CuO4 bulk system. Both the magnetic and the ESR measurement results suggested the existence of superparamagnetic component with the large g value in the nanoparticles.

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  • Neutron Scattering Study on the Spin Structure and Spin Dynamics of Organic Magnetic Materials

    1996 - 1997

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    TOMIYOSHI Shoichi, KONISHI Kensuke, AZUMA Nagao

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    Grant amount：\6400000 （ Direct Cost: \6400000 ）

    Magnetic properties of organic radical compounds are very attractive because the magnetic moment arises from an unpaired 2p electron in the molecular orbitals. However the ordered state in these organic magnetic materials is not well understood, especially spin structure study is not enough. In order to undersand the unique nature of organic magnetic materials we investigated by neutron diffraction the spin structure of an antiferromagnet PTV which has a high Neel temperature of 1.78K.However, because of the difficulties due to its low spin density, and very high neuron background arising from hydrogen atoms consisting the molecule, the observation of the magnetic Bragg reflections is not easy and until now the observation of which has been limited to only (011) reflection. So in the present work we tried to reduce the background by using deuterated TPV crystal which is 24mg in weight and has fairly good mosaic width. By the measurements of X-ray and magnetic susceptibility the deuterated crystal was found to have almost the same crystallographic and magnetic properties as that of usual TPV crystals. Neutron diffraction was measured using a triple axis spectrometer of TOPAN of JRR-3M reactor.
    The neutron back ground was fairly reduced by replacing hydrogen with deuteron. And many new magnetic reflections were observed by using deuterated TPV crystal. We analyzed the observed data using several spin structure models with various spin density distributions and we found as the most probable spin structure model of TPV that the antiferromagnetic spin chain extends toward the c direction, keeping antiphase coupling between the neighboring chains in the b-c plane and in-phase coupling between the neighboring chains in the a-c plane, and the spin density in a molecule distributes mainly on four nitrogen atoms in the verdazyl ring. This charge density destribution is roughly consistent with that deduced from the magnetic resonance data. At present the agreement between observed and calculated neutron data is not good due to poor counting statistics, but in near future neuron diffraction data will give clear spin density in organic magnetic materials in their ordered state.

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  • 有機ラジカル結晶の分子間相互作用と磁性

    1996

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    小西 健介

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    Grant amount：\900000 （ Direct Cost: \900000 ）

    本研究では、加圧による同一試料での分子間相互作用の制御を通して、有機ラジカル磁性体の磁気状態・相転移現象におよぼされる影響から分子磁性の機構に関する知見を得ることを目的として、有機分子の磁性を極低温・加圧下・磁場下における熱測定・磁気測定を基に検討した。
    まず、代表的な有機強磁性体p-NPNNにおいて圧力下で強磁性転移温度(Curie温度)が低下することを見出した。このCurie温度の低下は局在スピン系ではほとんど例がなく、従来調べられてきた反強磁性体の場合と全く逆の結果である。有機分子の強磁性相互作用の機構について理論的には分子軌道法を基にした計算がなされてきたが、上の実験結果は再検討すべき点が残されていることを指摘した。これらの点をふまえ、Curie温度の低下が分子間に働く強磁性および反強磁性的な交換相互作用の競合により説明できる事を指摘した[1]。
    また、フェルダジル基を母体とするラジカル結晶p-CDTVの低温における比熱・帯磁率の測定から、この物質がS=1/2一次元Heisenberg強磁性の良いモデル物質である事がわかり、三次元的な相関の寄与を補正した上でS=1/2一次元Heisenberg強磁性の臨界指数γが2であることを実験的に示した[2]。p-CDTVの低温における秩序状態は未だ明確でないが、加圧により磁気転移温度が上昇することから反強磁性ではないかという指摘が為されている。

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