Kyushu University Academic Staff Educational and Research Activities Database
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Yasukazu Murakami Last modified date:2019.07.27



Graduate School
Undergraduate School
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Administration Post
Other


E-Mail
Homepage
http://www.qpn.kyushu-u.ac.jp/lab3/member.html
people of research group .
Academic Degree
Doctor of Engineering
Country of degree conferring institution (Overseas)
No
Field of Specialization
Materials Science, Electron Microscopy
Total Priod of education and research career in the foreign country
01years00months
Outline Activities
Yasukazu Murakami is Professor of Kyushu University (previously, with Tohoku University). As an electron microscopist, Murakami is devoted to the studies of microscopic mechanisms underlying novel material functionalities and/or anomalous phenomena observed in crystalline solids. With respect to this research area, he has contributed to the studies of (1) pattern formation mechanisms in magnetic/nonmagnetic shape memory alloys [Phil Mag Lett: 2001, Acta Mater: 2002, APL:2003, 2008] , (2) nucleation and growth process of the ferromagnetic metal phase in hole-doped manganites [Nature: 2003, PRL: 2004, Nature Nanotech: 2010], (3) charge ordering in transition metal oxides [PRB: 1997, 2010, 2012], and others. He is also interested in the development of new techniques of electron microscopy. His achievements include (1) separation of the magnetic information form the electric information in electron holography observations [Nature 2003], (2) simultaneous measurements of structure, magnetisms and conductivity [APL: 2006], (3) determination of magnetic parameters from nanometer scale area [Nature Nanotech: 2010], and such other techniques.
Research
Research Interests
  • As an electron microscopist, Yasukazu Murakami is devoted to the studies of microscopic mechanisms underlying novel material functionalities and/or anomalous phenomena observed in solids. With respect to this research area, he has contributed to the studies of (1) pattern formation mechanisms in magnetic/nonmagnetic shape memory alloys [Phil Mag Lett: 2001, Acta Mater: 2002, APL:2003, 2008] , (2) nucleation and growth process of the ferromagnetic metal phase in hole-doped manganites [Nature: 2003, PRL: 2004, Nature Nanotech: 2010], (3) charge ordering in transition metal oxides [PRB: 1997, 2010, 2012], and others. He is also interested in the development of new techniques of electron microscopy. His achievements include (1) separation of the magnetic information form the electric information in electron holography observations [Nature 2003], (2) simultaneous measurements of structure, magnetisms and conductivity [APL: 2006], (3) determination of magnetic parameters from nanometer scale area [Nature Nanotech: 2010], and such other techniques.

    (1) revealing interface magnetism
    (2) direct observations of singular points in phase diagram
    (3) understanding domain switching phenomena induced by electric/magnetic fields
    (4) measurement of magnetic/electric constants form nanometer-scale area
    (5) simultaneous measurement of crystal structure, magnetism, and conductivity.
    (6) precursor phenomena in displacive (martensitic) transformations
    keyword : Electron Microscopy, Magnetic Materials, Phase Transformations, Pattern Formation
    2015.04~2018.03.
Academic Activities
Papers
1. Yasukazu Murakami, Taisuke Sasaki, Tadakatsu Ohkubo, Kazuhiro Hono, Strain measurements from Nd2Fe14B grains in sintered magnets using artificial moiré fringes, Acta Materialia, 10.1016/j.actamat.2015.08.058, 101, 101-106, 2015.09.
2. Yasukazu Murakami, Koudai Niitsu, Toshiaki Tanigaki, Ryosuke Kainuma, H. S. Park, Daisuke Shindo, Magnetization Amplified by Structural Disorder within Nanometer-scale Interface Region, Nature Communications, 5, 4133(1)-4133(8), 2014.06.
3. Yasukazu Murakami, Toshiaki Tanigaki, Taisuke Sasaki, Yumu Takeno, H. S. Park, Tsuyoshi Matsuda, Tadakatsu Ohkubo, Kazuhiro Hono, Daisuke Shindo, Magnetism of Ultrathin Intergranular Boundary Regions in Nd-Fe-B Permanent Magnets, Acta Materialia, 71, 370-379, 2014.04.
4. Yasukazu Murakami, Syota Konno, Taka-hisa Arima, Daisuke Shindo, Toshiaki Suzuki, Electric-field-induced Domain Switching in the Charge/orbital-ordered State of Manganite La0.5Sr1.5MnO4, Physical Revew B (Editor's Suggestion), 81, 140102(1)-140102(4), 2010.04.
5. Yasukazu Murakami, Hiroto Kasai, J. J. Kim, Shinichi Mamishin, Daisuke Shindo, Akira Tonomura, Ferromagnetic Domain Nucleation and Growth in Colossal Magnetoresistive Manganite, Nature Nanotechnology, 5, 37-41, 2010.01.
6. Yasukazu Murakami, J. H. Yoo, Daisuke Shindo, Toshiyuki Atou, Masae Kikuchi, Magnetization Distribution in the Mixed-phase State of Hole-doped Manganites, Nature, 423, 965-968, 2003.06.
Presentations
1. Yasukazu Murakami, Koudai Niitsu, Yuta Kimura, Ryosuke Kainuma, Daisuke Shindo, Transmission Electron Microscopy Studies of Premartensitic Phenomena in Ti- and Ni-based Alloys, International Conference of Martensitic Transformations, 2017.07.
2. 村上 恭和, Interface Magnetism Studied by Electron Holography with Multiple-biprisms, Microscopy & Microanalysis, 2015.08.
3. Yasukazu Murakami, Taisuke Sasaki, Toshiaki Tanigaki, Shuhei Kaneko, Kodai Niitsu, Zentaro Akase, Daisuke Shindo, Tadakatsu Ohkubo, Kazuhiro Hono, Electron holography studies on magnetization and lattice strain in Nd-Fe-B permanent magnets, ESICMM-G8 Symposium on Next Generation Permanent Magnets, 2015.06.