Naoki Ishimatsu

Last Updated :2024/04/03

Affiliations, Positions
Graduate School of Advanced Science and Engineering, Associate Professor (Special Recognition)
Other Contact Details
TEL : (+81)824-24-7386 FAX : (+81)824-24-0717
I am a high-pressure researcher using X-ray absorption spectroscopy

Basic Information

Major Professional Backgrounds

  • 2001/10/01, 2007/03/31, Hiroshima University, Graduate School of Science, Research Associate
  • 2007/04/01, 2020/03/31, Hiroshima University, Graduate School of Science, Assistant Professor
  • 2020/04/01, Hiroshima University, Graduate School of Advanced Science and Engineering, Assistant Professor
  • 2023/04/23, Hiroshima University, Associate Professor (Special Recognition)

Educational Backgrounds

  • Tokyo Institute of Technology, Japan, 1996/04, 1999/03
  • Toyama University, Japan, 1994/04, 1996/03
  • Toyama University, Japan, 1990/04, 1994/03

Academic Degrees

  • Doctor of Science, Tokyo Institute of Technology
  • Master of Science, Toyama University

Educational Activity

  • [Bachelor Degree Program] School of Science : Physics : Physics
  • [Master's Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Physics Program
  • [Doctoral Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Physics Program

In Charge of Primary Major Programs

  • Physics

Research Fields

  • Engineering;Material engineering;Structural / Functional materials

Research Keywords

  • high pressure
  • X-ray absorption spectroscopy
  • synchrotron radiation

Affiliated Academic Societies

  • The Japanese Society for Synchrotron Radiation Research
  • The Physical Society of Japan(JPS)
  • The Japan Society of High Pressure Science and Technology
  • The Iron and Steel Institute of Japan

Educational Activity

Course in Charge

  1. 2024, Undergraduate Education, 4Term, Advanced Physics
  2. 2024, Undergraduate Education, First Semester, Laboratory in PhysicsI
  3. 2024, Undergraduate Education, Second Semester, Laboratory in PhysicsII
  4. 2024, Undergraduate Education, 2Term, Special Lectures in Physics(Practical Data Analysis B (Condensed Matter Physics))
  5. 2024, Graduate Education (Master's Program) , 1Term, Special Topics in Synchrotron Radiation Science A
  6. 2024, Graduate Education (Master's Program) , First Semester, Exercise in Physics I
  7. 2024, Graduate Education (Master's Program) , Second Semester, Exercise in Physics II
  8. 2024, Graduate Education (Master's Program) , First Semester, Special Exsecise in Physics A
  9. 2024, Graduate Education (Master's Program) , Second Semester, Special Exsecise in Physics B
  10. 2024, Graduate Education (Master's Program) , Academic Year, Special Research in Physics

Research Activities

Academic Papers

  1. Ferrimagnetic coupling between cobalt and light rare-earth samarium induced by dense hydrogenation of SmCo5 permanent magnet under high pressures, PHYSICAL REVIEW MATERIALS, 7(2), 20230203
  2. Visualization of the disordered structure of Fe-Ni Invar alloys by reverse monte carlo calculations, FRONTIERS IN MATERIALS, 9, 20220902
  3. Impacts of pressure to the structural, electronic and magnetic properties of Dirac semimetal EuMnBi2, PHYSICAL REVIEW RESEARCH, 3(4), 20211011
  4. Elongation of Fe-Fe atomic pairs in the Invar alloy Fe65Ni35, PHYSICAL REVIEW B, 103(22), 20210615
  5. Strong variant selection observed in the alpha-epsilon martensitic transition of iron under quasihydrostatic compression along [111](alpha), PHYSICAL REVIEW B, 102(5), 20200825
  6. Melting Curve and Phase Relations of Fe-Ni Alloys: Implications for the Earth's Core Composition, GEOPHYSICAL RESEARCH LETTERS, 47(14), 20200728
  7. Conical support for double-stage diamond anvil apparatus, HIGH PRESSURE RESEARCH, 40(1), 12-21, 20200102
  8. Element-selective elastic properties of Fe65Ni35 Invar alloy and Fe72Pt28 alloy studied by extended X-ray absorption fine structure, HIGH PRESSURE RESEARCH, 40(1), 130-139, 20200102
  9. An application of NPD to double-stage diamond anvil cells: XAS spectra of rhenium metal under high pressures above 300 GPa, HIGH PRESSURE RESEARCH, 40(1), 119-129, 20200102
  10. Pressure-Induced Collapse of the Guest Eu Off-Centering in Type-I Clathrate Eu8Ga16Ge30, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 88(11), 20191115
  11. Temperature and pressure dependences of Sm valence in intermediate valence compound SmB6, PHYSICA B-CONDENSED MATTER, 536, 197-199, 20180501
  12. Pressure and magnetic field effects on the valence transition of EuRh2Si2, PHYSICA B-CONDENSED MATTER, 536, 427-431, 20180501
  13. Kondo-like behavior near the magnetic instability in SmB6: Temperature and pressure dependences of the Sm valence, PHYSICAL REVIEW B, 97(16), 20180430
  14. Emergence of a new valence-ordered structure and collapse of the magnetic order under high pressure in EuPtP, JOURNAL OF PHYSICS-CONDENSED MATTER, 30(10), 20180314
  15. Effect of Fe-site Substitution on Pressure-induced Spin Transition in SrFeO2, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 86(12), 20171215
  16. Isotropic shrinkage of the oxygen octahedron in SrTiO3 under uniaxial pressure, JOURNAL OF PHYSICS-CONDENSED MATTER, 29(39), 20171004
  17. Relationship between element-selective electronic states and hydrogen absorption properties of Pd-M (M = Ru, Rh, Ag, and Au) alloys, PHYSICAL REVIEW B, 95(2), 20170130
  18. High-Pressure-Hydrogen-Induced Spin Reconfiguration in GdFe2 Observed by Fe-57-Polarized Synchrotron Radiation Mossbauer Spectroscopy with Nuclear Bragg Monochromator, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 85(12), 20161215
  19. Pressure-Driven Spin Crossover Involving Polyhedral Transformation in Layered Perovskite Cobalt Oxyfluoride, SCIENTIFIC REPORTS, 6, 20161102
  20. Two-Step Suppression of Charge Disproportionation in CaCu3Fe4O12 under High Pressure, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 85(3), 20160315
  21. Differences in local structure around Co and Fe of the BiCo1-xFexO3 system determined by x-ray absorption fine structure, PHYSICAL REVIEW B, 92(5), 20150821
  22. Pressure-Induced Valence Crossover and Novel Metamagnetic Behavior near the Antiferromagnetic Quantum Phase Transition of YbNi3Ga9, PHYSICAL REVIEW LETTERS, 114(8), 20150224
  23. alpha-epsilon transition pathway of iron under quasihydrostatic pressure conditions, PHYSICAL REVIEW B, 90(1), 20140717
  24. 064206Structural, magnetic and electronic state characterization of L1(0)-type ordered FeNi alloy extracted from a natural meteorite, JOURNAL OF PHYSICS-CONDENSED MATTER, 26(6), 20140212
  25. Hydrogen-induced modification of the electronic structure and magnetic states in Fe, Co, and Ni monohydrides, PHYSICAL REVIEW B, 86(10), 20120924
  26. Pressure-induced changes in the magnetic and valence state of EuFe2As2, PHYSICAL REVIEW B, 84(2), 20110705
  27. Paramagnetism with anomalously large magnetic susceptibility in beta(fcc)-cobalt probed by x-ray magnetic circular dichroism up to 170 GPa, PHYSICAL REVIEW B, 83(18), 20110509
  28. Pressure-Induced Spin-State Transition in BiCoO3, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 132(27), 9438-9443, 20100714
  29. Effect of hydrogenation on the electronic state ofmetallic La hydrides probed by X-ray absorption spectroscopy at the La L-edges, Journal of Physics: Conference Series, 012070, 20091101
  30. Orbital contribution to perpendicular magnetic anisotropy in Co80Pt20 thin films, JOURNAL OF APPLIED PHYSICS, 106(3), 20090801
  31. 21aYG-5 Ga K-edge XMCD in Mn_3GaC at low temperature under high pressure, Meeting abstracts of the Physical Society of Japan, 63(2), 20080825
  32. Application of photoelectron emission microscopy (PEEM) to extraterrestrial materials, SURFACE SCIENCE, 601(20), 4764-4767, 20071015
  33. Easy-axis rotation in meteoritic iron probed by photoelectron emission microscope (PEEM), SURFACE SCIENCE, 601(18), 4326-4328, 20070915
  34. The Valence state of Yb ion in YbInAu2 Compound at High Pressure determined by x-ray diffraction and x-ray Absorption near edge structure measurements, Journal of Applied Physics, 100, 043712 1-4, 20061001
  35. Maicrostructure analysis using a photoelectron emission microscope (PEEM) with hard x-ray, e-Journal of Surface Science and Nanotechnology, 4, 490-493, 20060703
  36. XMCD study of magnetic phase transition in Mn3ZnC perovskite, PHYSICA B-CONDENSED MATTER, 351(3-4), 328-332, 20040915
  37. The Valence state of Yb metal unser high pressure determined by XANES measurement up to 34.6 GPa, J. Alloys and Compounds, 375, 34-37, 20040401
  38. XMCD study of magnetic transition in Mn3ZnC perovskite, Physica B, 351, 328-332, 20040401
  39. Mg/Si ratios of aqueous fluids coexisting with forsterite and enstatite based on the phase relation in the Mg2SiO4-SiO2-H2O system, American Mineralogist, 89, 1433-1437, 20040401
  40. Pressure-Induced Magnetic Transition in Fe4N Probed by Fe K-edge XMCD Measurement, J. Phys. Sci. Jpn., 72, 2372-2376, 20030901
  41. X-ray magnetic circular dichroism study of metamagnetic behaviour in the heavy-fermion system CeRu2Si2, JOURNAL OF PHYSICS-CONDENSED MATTER, 15(28), S2171-S2174, 20030723
  42. X-ray Magnetic Circular Dichroism Study of Metamagnetic Behaviour in the Heavy-Fermion System CeRu_2_Si_2_, J. Phys.: Condens. Matter, 15, S2171-2174, 20030401
  43. Magnetization curves of an Fe/Gd multilayer film calculated from Gd magenetization depth profiles determined by resonant x-ray magnetic scattering, J. Phys.= Condens. Matter, 14, 5289-5301, 20020401
  44. Studies of the pressure dependence of the charge density distribution in cerium phosphide by the maximum-entropy method, J. Physics: Cond. Matt., 14, ) 11143-11146, 20020401
  45. Pressure-Induced Magnetic Transition in Fe4N Probed by Fe K-edge XMCD Measurement, Nuclear Inst. and Methods in Physics Research, A467-8, 1061-1063, 20010401
  46. Pressure-induced phase transitions in lanthanide monoantimonides with a NaCl-type structure,, Physical Review B, 64, 132101, 20010401
  47. Magnetic structure of Fe/Gd multilayers determined by resonant x-ray magnetic scattering, Physical Review B, B60(13), 9596-9606, 19991001
  48. Charge-Magnetic Roughness Correlations in an Fe/Gd Multilayer, Physical Review B, 60, 12234-12238, 19990401
  49. Resonant X-ray magnetic scattering from a twisted states of an Fe/Gd multilayer, Physica, B248, 133-139, 19980401
  50. X-ray reflectivity at the L edges of Gd, Journal of Synchrotron Radiation, 4, 175-179, 19970701
  51. X-ray circular dichroic Bragg reflection from a GdCo/Ag multilayer, Japanese Journal of Applied Physics, 36, 4525-4530, 19970401
  52. Pressure-induced valence change toward the QCP in 4f-electron compounds determined by X-ray absorption spectroscopy, HIGH PRESSURE RESEARCH, 36(3), 419-428, 201609
  53. Applications of nano-polycrystalline diamond anvils to X-ray absorption spectroscopy under high pressure, HIGH PRESSURE RESEARCH, 36(3), 381-390, 201609
  54. X-ray absorption study of the local dipole moment in SrTiO3 under uniaxial pressure, JOURNAL OF THE KOREAN PHYSICAL SOCIETY, 66(9), 1386-1388, 201505
  55. Simultaneous Pressure-Induced Magnetic and Valence Transitions in Type-I Clathrate Eu8Ga16Ge30, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 83(1), 201401
  56. Pressure-Temperature Phase Diagram of Sm Valence State in a Heavy Fermion Compound SmOs4Sb12, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 82(2), 201302
  57. Glitch-free X-ray absorption spectrum under high pressure obtained using nano-polycrystalline diamond anvils, JOURNAL OF SYNCHROTRON RADIATION, 19, 768-772, 201209
  58. Instability of Co Spin Moment in ErCo2 Probed by Magnetic Compton Scattering under High Pressure, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 80(9), 201109
  59. Colossal negative thermal expansion in BiNiO3 induced by intermetallic charge transfer, NATURE COMMUNICATIONS, 2, 201106
  60. Noncollinear Spin Structure in Fe-Ni Invar Alloy Probed by Magnetic EXAFS at High Pressure, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 80(2), 201102
  61. Antiferromagnetic Phase Transition in Ordered FePt3 Investigated by Angle-Resolved Photoemission Spectroscopy, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 79(2), 201002
  62. Direct observation of the pressure-induced charge redistribution in BiNiO3 by x-ray absorption spectroscopy, PHYSICAL REVIEW B, 80(23), 200912
  63. X-ray magnetic spectroscopy at high pressure: performance of SPring-8 BL39XU, JOURNAL OF SYNCHROTRON RADIATION, 16, 730-736, 200911
  64. Luminescence mechanism of (Pr, Al)-doped SrTiO(3) fine particles investigated by x-ray absorption spectroscopy, PHYSICAL REVIEW B, 78(7), 200808
  65. Stability of ferromagnetism in Fe, Co, and Ni metals under high pressure, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 76(6), 200706
  66. Experimental evidence of pressure-induced suppression of the cobalt magnetic moment in ErCo2, PHYSICAL REVIEW B, 75(18), 200705
  67. X-ray magnetic circular dichroism study of the decoupling of the magnetic ordering of the Er and Co sublattices in Er1-xYxCo2 systems, PHYSICAL REVIEW B, 75(14), 200704
  68. Relationship between the magnetic moment of Lu and the magnetic behavior of (YyLu1-y)(Co1-xAlx)(2) from x-ray absorption spectroscopy and x-ray magnetic circular dichroism, PHYSICAL REVIEW B, 75(6), 200702
  69. Revealing Fe magnetism in lanthanide-iron intermetallic compounds by tuning the rare-earth L-2,L-3-edge x-ray absorption edges, PHYSICAL REVIEW B, 72(5), 200508
  70. Depth profile of spin and orbital magnetic moments in a subnanometer Pt film on Co, PHYSICAL REVIEW B, 72(5), 200508
  71. Magnetic phase transition in Laves phase DyCo2 probed by XRD and XMCD under high pressure, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 238(1-4), 167-170, 200508
  72. Experimental system for X-ray magnetic diffraction under extreme conditions, JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 65(12), 2089-2092, 200412
  73. Mg/Si ratios of aqueous fluids coexisting with forsterite and enstatite based on the phase relations in the Mg2SiO4-SiO2-H2O system, AMERICAN MINERALOGIST, 89(10), 1433-1437, 200410
  74. Magnetic structures of an iron-gadolinium multilayer at low temperatures, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 41(3A), 1331-1339, 200203
  75. Direct metallographic analysis of an iron meteorite using hard x-ray photoelectron emission microscopy, IBM JOURNAL OF RESEARCH AND DEVELOPMENT, 55(4), 2011
  76. Novel Magnetic Domain Structure in Iron Meteorite Induced by the Presence of L1(0)-FeNi, APPLIED PHYSICS EXPRESS, 3(1), 2010
  77. Magnetic moment in the top Pt layer of Co/Pt bilayers, PHYSICA SCRIPTA, T115, 580-582, 2005
  78. Ga magnetic polarization in Mn3GaC under high pressure probed by GaK-edge XMCD, PHYSICA SCRIPTA, T115, 591-593, 2005

External Funds

Acceptance Results of Competitive Funds

  1. KAKENHI(Grant-in-Aid for Transformative Research Areas(A)), 2021, 2022
  2. KAKENHI(Grant-in-Aid for Scientific Research (B)), 2021, 2023
  3. KAKENHI, 2013, 2015
  4. KAKENHI, Study of Hydrogen effect on the electronic state of transition metal hydrides, 2011, 2012
  5. KAKENHI, Magnetic Anisotropy and Orbilal Magnetic Moment in Ordered FePt Nanoparticles, 2005, 2007
  6. KAKENHI, Mechanism and novel functions of pressure-induced superconductor-insulator transition in chalcogenide spinels, 2005, 2007
  7. KAKENHI, 2004, 2005
  8. KAKENHI, 2015
  9. KAKENHI(Fund for the Promotion of Joint International Research (Fostering Joint International Research)), 2016, 2017
  10. KAKENHI(Grant-in-Aid for Scientific Research (C)), 2017, 2019