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Hiroaki Mamiya

Hiroaki MAMIYA

Chief Researcher, Green Magnetic Materials Group

Hiroaki Mamiya is a chief researcher at NIMS working on fundamental magnetism and neutron-based characterization of soft and hard magnetic materials.

He was ranked in the World's top 2% scientists in General Physics/Applied Physics by Stanford University and Elsevier (2022/2023).

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Mamiya's Research

Recent Papers (First/Last Author)

  1. Role of neutron Bragg-edge spectroscopy in development of practical magnetic materials

    H. Mamiya, N. Terada, K. Hiroi, T. Shinohara, and H. Sepehri-Amin

    J. Appl. Phys. 138 (2025) 143904 (Featured)

    DOI: 10.1063/5.0285904

  2. Evaluation of Ho100-x-yErxCey magnetic refrigerants using advanced multisample neutron transmission spectroscopy

    H. Mamiya, N. Terada, S.R. Larsen, N. Tsujii, K. Hiroi, T. Shinohara, and H. Sepehri-Amin

    Phys. Rev. Research 7 (2025) 013233

    DOI: 10.1103/PhysRevResearch.7.013233

  3. Neutron imaging for magnetization inside an operating inductor

    H. Mamiya, Y. Oba, N. Terada, K. Hiroi, T. Ohkubo, and T. Shinohara

    Scientific Reports 13 (2023) 9184

    DOI: 10.1038/s41598-023-36376-x

Other Representative Papers (First/Last Author)

  1. High-efficiency magnetic refrigeration using holmium

    N. Terada and H. Mamiya

    Nature Communications 12 (2021) 1212 (98 cited in WoS, Top10% in 2021 Multidisciplinary Sciences)

    DOI: 10.1038/s41467-021-21234-z

  2. Estimation of Magnetic Anisotropy of Individual Magnetite Nanoparticles for Magnetic Hyperthermia

    H. Mamiya, H. Fukumoto, J.L. Cuya Huaman, K. Suzuki, H. Miyamura, and B. Jeyadevan

    ACS Nano 14(7) (2020) 8421 (80 cited in WoS, Top10% in 2020 Chem.)

    DOI: 10.1021/acsnano.0c02521

  3. Magnetic Bragg dip and Bragg edge in neutron transmission spectra of typical spin superstructures

    H. Mamiya, Y. Oba, N. Terada, N. Watanabe, K. Hiroi, T. Shinohara, and K. Oikawa

    Scientific Reports 7 (2017) 15516

    DOI: 10.1038/s41598-017-15850-3

  4. Hyperthermic effects of dissipative structures of magnetic nanoparticles in large alternating magnetic fields

    H. Mamiya and B. Jeyadevan

    Scientific Reports 1 (2011) 157 (Nature Japan Featured Article; 177 cited in WoS, Top2% in 2011 Phys.)

    DOI: 10.1038/srep00157

  5. A reversion of magnetization decay in spin glasses

    H. Mamiya and S. Nimori

    New Journal of Physics 12(8) (2010) 083007

    DOI: 10.1088/1367-2630/12/8/083007

  6. Aging and memory effects in superparamagnets and superspin glasses

    M. Sasaki, P.E. Jonsson, H. Takayama, and H. Mamiya

    Physical Review B 71(10) (2005) 104405 (336 cited in WoS, Top1% in 2005 Phys.)

    DOI: 10.1103/PhysRevB.71.104405

  7. Magnetic Relaxations of Antiferromagnetic Nanoparticles in Magnetic Fields

    T. Furubayashi, I. Nakatani, and H. Mamiya

    Physical Review Letters 88 (2002) 067202

    DOI: 10.1103/PhysRevLett.88.067202

  8. Phase Transitions of Iron-Nitride Magnetic Fluids

    H. Mamiya, I. Nakatani, and T. Furubayashi

    Physical Review Letters 84 (2000) 6106 (76 cited in WoS, Top10% in 2000 Phys.)

    DOI: 10.1103/PhysRevLett.84.6106

  9. Slow Dynamics for Spin-Glass-Like Phase of a Ferromagnetic Fine Particle System

    H. Mamiya, I. Nakatani, and T. Furubayashi

    Physical Review Letters 82 (1999) 4332 (108 cited in WoS, Top10% in 1999 Phys.)

    DOI: 10.1103/PhysRevLett.82.4332

  10. Blocking and Freezing of Magnetic Moments for Iron Nitride Fine Particle Systems

    H. Mamiya, I. Nakatani, and T. Furubayashi

    Physical Review Letters 80 (1998) 177 (200 cited in WoS, Top2% in 1998 Phys.)

    DOI: 10.1103/PhysRevLett.80.177

  11. Structural and magnetic studies on vanadium spinel MgV2O4

    H. Mamiya et al.

    Journal of Applied Physics 81 (1997) 5289 (94 cited in WoS, Top10% in 1997 Phys.)

    DOI: 10.1063/1.364518

Review Articles

  1. New Materials for Cryogenic Magnetic Refrigeration for Hydrogen Liquefaction Cost Reduction

    H. Mamiya, Chemistry & Chemical Industry 76 (2023) 308

  2. Magnetic Refrigerants Efficiently Utilizing Magnetocaloric Effects

    H. Mamiya et al., Netsu Sokutei 49 (2022) 79

  3. Comprehensive Analysis on Structural Materials

    H. Mamiya et al., Journal of the Japan Society for Precision Engineering 86 (2020) 201

  4. Potential of Neutron Transmission Spectroscopy in Magnetism and Magnetics

    H. Mamiya, Hamon 28 (2018) 123

  5. Recent advances in magnetic fluid research: Cooperative phenomena induced by inter-particle interactions and their utilization

    H. Mamiya, Magnetics Japan 13 (2018) 28

  6. Recent Advances in Understanding Magnetic Nanoparticles in AC Magnetic Fields and Optimal Design for Targeted Hyperthermia

    H. Mamiya, J. Nanomater. 2013 (2013) 752973 (77 cited in WoS, Top10% in 2013 Mater. Sci.)

    DOI: 10.1155/2013/752973

  7. Magnetic response of nanoparticles to AC magnetic fields and targeted thermotherapy

    H. Mamiya, Materials Integration 25 (2012) 11

  8. Collective Phenomena in Assembled Superparamagnetic Nanomagnets

    H. Mamiya et al., Nihon Butsuri Gakkaishi 60 (2005) 547

  9. Superparamagnetism - Magnetization Curve and Blocking Temperature -

    H. Mamiya et al., J. Magn. Soc. Jpn C 27 (2003) 59

  10. Spin Glass-like Order for Ferromagnetic Fine Particles with Dipolar Interaction

    H. Mamiya et al., Solid State Physics 34 (1999) 901

Books

  1. Magnetic fluid hyperthermia; a guide for design of thermal seeds within the limits of conventional theory

    Nanomagnetic Materials

    H. Mamiya, B. Jeyadevan; Ed. A. Yamaguchi, A. Hirohata, B. Stadler, Elsevier, 2021, ISBN 9780128223543

  2. Design Criteria of Thermal Seeds for Magnetic Fluid Hyperthermia From Magnetic Physics Point of View

    Chapter in Nanomaterials for Magnetic and Optical Hyperthermia Applications, 1st Edition

    H. Mamiya, B. Jeyadevan; Ed. Raluca Fratila, Jesus Martinez De La Fuente, Elsevier, 2018, ISBN 9780128139288

  3. Advances in Nanoparticle Fluid System

    H. Mamiya and Y. Iwamoto, JSMFR, Tokyo, 2015, ISBN 978-4-908239-00-73

  4. Magnetic Properties of Nanoparticles

    H. Mamiya, Yushodo, Tokyo, 2003, ISBN 9784841911633

Press Releases

  1. No Need for Rare Earths or Liquid Helium! Cryogenic Cooling Material Composed Solely of Abundant Elements

    NIMS Press Release on 2025.12.24

  2. High Efficiency Magnetic Cooling by Using Small Magnetic Field Changes

    NIMS Press Release on 2021.02.19

  3. New Method Offers Greater Flexibility in Equipment Design and Simplifies Spin Arrangement Observation

    NIMS Press Release on 2017.11.17

  4. Hyperthermia Treatment of Cancer Using Magnetic Nanoparticles: First Detailed Elucidation of Heat Generation Mechanism

    NIMS Press Release on 2011.11.15

Employment History

  • 2019 - 2020

    Manager, Corporate Strategy Office, NIMS

  • 2018 - 2020

    Part-time Lecturer, University of Shiga Prefecture

  • 2016 - 2018

    Chief Beamline Scientist, Mini-Focusing Small-Angle Neutron Scattering instrument, ISSP, University of Tokyo

  • 2001 - Present

    Research Scientist, NIMS

  • 1994 - 2001

    Research Scientist, National Research Institute for Metals

Academic Information

  • 2002

    Ph.D. (Applied Physics), University of Tsukuba

  • 1994

    Master Degree (Physics), University of Tsukuba

  • 1992

    Bachelor Degree (Physics), University of Tsukuba

Awards

  • TAKEI Award, The Magnetics Society of Japan, 2001
  • Incentive Award, The Japan Institute of Metals, 2000