Magnetism and Magnetic Materials at Kyoto University

Magnetism and Magnetic Materials

Updated on April 19th, 2024


2024

  • Site-selective cobalt substitution in La-Co co-substituted magnetoplumbite-type ferrites: 59Co-NMR and DFT calculation study
    H. Nakamura, H. Ohta, R. Kobayashi, T. Waki, Y. Tabata, H. Ikeno, and C. Meny
    J. Phys. Mater. 7, 025012 (2024).
    DOI: 10.1088/2515-7639/ad3b6d

  • A new double-layered kagome antiferromagnet ScFe6Ge4
    M.A. Kassem, T. Shiotani, H. Ohta, Y. Tabata, T. Waki, and H. Nakamura
    Solid State Commun. 385, 115513 (2024).
    DOI: 10.1016/j.ssc.2024.115513

  • Magnon thermal Hall effect via emergent SU(3) flux on the antiferromagnetic skyrmion lattice
    H. Takeda, M. Kawano, K. Tamura, M. Akazawa, J. Yan, T. Waki, H. Nakamura, K. Sato, Y. Narumi, M. Hagiwara, M. Yamashita, and C. Hotta
    Nat. Commun. 15, 556, (2024).
    DOI: 10.1038/s41467-024-44793-3

2023

  • Single crystal growth, magnetic anisotropy, specific heat, and high-field magnetization in RInCu4, R = Gd, Tb
    T. Waki, F. Kihara, Y. Tabata, T. Takeuchi, Y. Narumi, M. Hagiwara, K. Kindo, and H. Nakamura
    J. Phys. Soc. Jpn. 92, 104706/1-7 (2023)
    DOI: 10.7566/JPSJ.92.104706

  • Role of oxygen potential in dopant solubility in ferrite magnets: Enhanced Zn solubility and magnetization in La-Zn co-substituted magnetoplumbite-type strontium ferrite
    T. Waki, S. Nakai, Y. Tabata, H. Nakamura
    Mater. Res. Bull. 168, 112470/1-6 (2023)
    DOI: 10.1016/j.materresbull.2023.112470

  • Novel slow dynamics of phase transition in the partially ordered frustrated magnet DyRu2Si2
    S. Yoshimoto, Y. Tabata, T. Waki, and H. Nakamura
    J. Phys. Soc. Jpn. 92, 094705/1-8 (2023).
    DOI: 10.7566/JPSJ.92.094705

  • Doping dependence of the in-plane transition in Co3Sn2S2
    I. Živković, M.A. Kassem, Y. Tabata, T. Waki, and H. Nakamura
    J. Phys. Soc. Jpn. 92, 095001/1-2 (2023).
    DOI: 10.7566/JPSJ.92.095001

  • Emergent strong ferromagnetism in site-ordered Laves phase YMgCo4
    T. Shiotani, H. Ohta, T. Waki, Y. Hashimoto, Y. Tabata, H. Nakamura
    J. Alloys Compd. 961, 170990/1-6 (2023).
    DOI: 10.1016/j.jallcom.2023.170990

  • Nodal-line resonance generating the giant anomalous Hall effect of Co3Sn2S2
    F. Schilberth, M.-C. Jiang, S. Minami, M.A. Kassem, F. Mayr, T. Koretsune, Y. Tabata, T. Waki, H. Nakamura, G.-Y. Guo, R. Arita, I. Kézsmárki, S. Bordács
    Phys. Rev. B 107, 214441/1-8 (2023).
    DOI: 10.1103/PhysRevB.107.214441

  • Study on factors hindering the single-phase formation of divalent-ion-stabilized W-type ferrites
    S. Nakai, T. Waki, Y. Tabata, M. Kato, H. Ohta, H. Nakamura
    Mater. Trans. 64, 1072-1077 (2023).
    DOI: 10.2320/matertrans.MT-Y2022010

  • Effect of extra cation substitution on magnetic anisotropy of La-Co co-substituted M-type Sr Ferrite
    T. Waki, H. Nishida, Y. Tabata, H. Nakamura
    IEEE Trans. Magn. 59, 2100104/1-4 (2023).
    DOI:10.1109/TMAG.2023.3262654

  • Dressed jeff-1/2 objects in mixed-valence lacunar spinel molybdates
    T. Petersen, L. Prodan, K. Geirhos, H. Nakamura, I. Kézsmárki and L. Hozoi
    Sci. Rep. 13, 2411 (2023)
    DOI:10.1038/s41598-023-28656-3

  • Study on the Increase of Co Concentration and the Purification of La-Co Cosubstituted M-Type Sr Ferrite by Oxygen Partial Pressure Control
    T. Waki, K. Hani, Y. Tabata, H. Nakamura
    Mater. Trans. 64, 564-567 (2023).
    DOI:10.2320/matertrans.MT-Y2022008

  • Optimizing a microwave-combustion synthesis and particle-size dependent magnetic properties of M-type Sr ferrite
    A.M. Nashaat, A.A. El-Fadl, M.A. Kassem, and H. Nakamura
    Mater. Chem. Phys. 305, 128008/1-10 (2023).
    DOI: 10.1016/j.matchemphys.2023.128008

  • Glassy magnetic freezing and exchange bias effect in NiCo2O4/(Co-Ni)O nanoparticles composite
    A.M. Nashaat, A.A. El-Fad, H. Nakamura, M.A. Kassem
    J. Magn. Magn. Mater. 567, 170366 (2023).
    DOI:10.1016/j.jmmm.2023.170366

2022

  • Study on Site Preference and Electronic State of Y2(MnxFe1-x)12P7 with the Zr2Fe12P7-type Structure
    T. Shiotani, H. Ohta, T. Waki, Y. Tabata, and H. Nakamura
    J. Jpn. Soc. Powder Powder Metallurgy 69, 461-466 (2022).
    DOI:10.2497/jjspm.69.461

  • Study on Factors Hindering the Single-phase Formation of Divalent-ion-stabilized W-type Ferrites (in Japanese)
    S. Nakai, T. Waki, Y. Tabata, M. Kato, H. Ohta, and H. Nakamura
    J. Jpn. Soc. Powder Powder Metallurgy 69, 455-460 (2022).
    DOI:10.2497/jjspm.69.455

  • Guiding principles for searching for base materials for high performance ferrite magnets (in Japanese)
    H. Nakamura
    Magnetics Jpn. 17(4), 194-200 (2022).

  • Bismuth substitution at the strontium site in the magnetoplumbite-type Sr ferrite: Phase stability, structure, and magnetic properties
    M.A.Kassem, T. Waki, Y. Tabata, H. Nakamura
    J. Magn. Magn. Mater. 560, 169603/1-8 (2022).
    DOI: 10.1016/j.jmmm.2022.169603

  • Study on the increase of Co concentration and the purification of La-Co cosubstituted M-type Sr ferrite by oxygen partial pressure control (in Japanese)
    T. Waki, K. Hani, Y. Tabata, H. Nakamura
    J. Jpn. Soc. Powder Powder Metallurgy, 69, 288-292 (2022).
    DOI: 10.2497/jjspm.69.288
    ★6/6/2023 It was awarded. Please click here to see the photo of the commemorative shield.

  • The origin of uniaxial anisotropy of La-Co co-substituted M-type ferrites (in Japanese)
    T. Waki
    J. Jpn. Soc. Powder Powder Metallurgy 69, 149-154 (2022).
    DOI:10.2497/jjspm.69.149

  • Effects of local lattice deformation on magnetic anisotropy of W-type ferrites
    J. Inoue, H. Koizumi, H. Nakamura, H. Yanagihara
    J. Magn. Magn. Mater. 551, 169112/1-7 (2022).
    DOI: 10.1016/j.jmmm.2022.169112

  • Squeezing the periodicity of Néel-type magnetic modulations by enhanced Dzyaloshinskii-Moriya interaction of 4d electrons
    A. Butykai K. Geirhos, D. Szaller, L. F. Kiss, L. Balogh, M. Azhar, M. Garst, L. DeBeer-Schmitt, T. Waki, Y. Tabata, H. Nakamura, I. Kézsmarki, and S. Bordács
    npj Quantum Mater. 7, 26/1-7 (2022).
    DOI: 10.1038/s41535-022-00432-y

  • Guiding principles for making high performance ferrite magnets (in Japanese)
    H. Nakamura, S. Nakai, R. Kobayashi, M.A. Kassem, H. Ohta, T. Waki, Y. Tabata, H. Ikeno
    National Convention Record I.E.E. Japan, 2022, S1-7.

2021

  • Pressure dependence of ferromagnetic phase boundary in BaVSe3 studied with high-pressure μ+SR
    J. Sugiyama, W. Higemoto, D. Andreica, O.K. Forslund, E. Nocerino, M. Mansson, Y. Sassa, R. Gupta, R. Khasanov, H. Ohta, and H. Nakamura
    Phys. Rev. B 103, 104418/1-10 (2021).
    DOI: 10.1103/PhysRevB.103.104418

  • Structure and cationic distribution dependent soft magnetic properties of single-domain (Mg-Ni)Fe2O4 (0 ≤ x ≤ 1.0) nanocrystals
    M.A. Kassem, A. Abu El-Fadl, A.M. Hassan, A.M. Gismelssed, H. Nakamura
    Mater. Sci. Eng. B 274, 115494/1-11 (2021)
    DOI: 10.1016/j.mseb.2021.115494

2020

  • Unconventional critical behaviors at the magnetic phase transition of Co3Sn2S2 kagome ferromagnet
    M.A. Kassem, Y. Tabata, T. Waki, and H. Nakamura
    J. Phys.: Condens. Matter 33, 015801/1-11 (2020).
    DOI: 10.1088/1361-648X/abaf94

  • Magnetic anisotropy of Y-type ferrites: Role of the local lattice structure
    J. Inoue, H. Koizumi, H. Nakamura, and H. Yanagihara
    J. Phys. D 53, 455001/1-9 (2020).
    DOI: 10.1088/1361-6463/aba3ea

  • Magnetic anisotropies of La-Co substituted M-type Sr hexaferrites studied by 57Fe Mössbauer spectroscopy with external magnetic fields
    N. Nagasawa, M. Oura, S. Ikeda, T. Waki, Y. Tabata, H. Nakamura, and H. Kobayashi
    J. Appl. Phys. 128, 133901/1-8 (2020).
    DOI: 10.1063/5.0019954

  • Magnetic phase boundary of BaVS3 clarified with high-pressure μ+SR
    J. Sugiyama, D. Andreica, O.K. Forslund, E. Nocerino, N. Matsubara, Y. Sassa, Z. Guguchia, R. Khasanov, F.L. Pratt, H. Nakamura, and M. Mansson
    Phys. Rev. B 101, 174403/1-10 (2020).
    DOI: 10.1103/PhysRevB.101.174403

  • Lattice dynamics and electronic excitations in a large family of lacunar spinels with a breathing pyrochlore lattice structure
    S. Reschke, F. Meggle, F. Mayr, V. Tsurkan, L. Prodan, H. Nakamura, J. Deisenhofer, C. A. Kuntscher, and I. Kézsmarki
    Phys. Rev. B 101, 075118/1-11 (2020).
    DOI: 10.1103/PhysRevB.101.075118

  • Magnetic measurements of narrow-Gap semiconductor FeSb2 under high pressure
    T. Deguchi, K. Matsubayashi, Y. Uwatoko, T. Koyama, T. Kohara, H. Nakamura, Y. Mitsui, K. Koyama
    Mater. Trans. 61, 1476-1479 (2020).
    DOI:10.2320/matertrans.MT-MN2019015

  • Phase stability of Ce-substituted magnetoplumbite-type Sr ferrite
    T. Waki, G. Inoue, Y. Tabata and H. Nakamura
    IEEE Trans. Magn. 56, 6702304/1-4 (2020).
    DOI:10.1109/TMAG.2019.2961991

  • Function of Co in Co-substituted M-type ferrites: 59Co-NMR study (review, in Japanese)
    H. Nakamura
    J. Jpn. Soc. Powder Powder Metallurgy 67, 78-83 (2020).
    DOI:10.2497/jjspm.67.78

  • Single crystal synthesis and magnetic properties of Co2+-substituted and non-substituted magnetoplumbite-type Na–La ferrite
    T. Waki, K. Takao, Y. Tabata, H. Nakamura
    J. Solid State Chem. 282, 121071 (2020).
    DOI:10.1016/j.jssc.2019.121071

  • Magnetic evolution from the superparamagnetism in nanospinel chromites (Cd-Co)Cr2O4 (0 ≤ x ≤ 1.0)
    M.A. Kassem, A. Abu El-Fadl, A.M. Nashaat, H. Nakamura
    J. Magn. Magn. Mater. 495, 165830 (2020).
    DOI:10.1016/j.jmmm.2019.165830

2019

  • Magnetic domain structure within half-metallic ferromagnetic kagome compound Co3Sn2S2
    A. Sugawara, T. Akashi, M. A. Kassem, Y. Tabata, T. Waki, H. Nakamura
    Phys. Rev. Mater. 3, 104421 (2019).
    DOI:10.1103/PhysRevMaterials.3.104421

  • Structure, optical and varying magnetic properties of insulating MCr2O4 (M = Co, Zn, Mg and Cd) nanospinels
    M.A. Kassem, A. Abu El-Fadl, A.M. Nashaat, H. Nakamura
    J. Alloys. Compd. 790, 853-862 (2019).
    DOI:10.1016/J.JALLCOM.2019.03.189

  • Local strain dependence of uniaxial magnetic anisotropy in M-type ferrites
    J. Inoue, H. Nakamura, and H. Yanagihara
    T. Magn. Soc. Jpn. (Special Issues) 3, 12-18 (2019).
    DOI: 10.20819/msjtmsj.19TR303

  • Co site preference and site-selective substitution in La-Co co-substituted magnetoplumbite-type strontium ferrites probed by 59Co nuclear magnetic resonance
    H. Nakamura, T. Waki, Y. Tabata, and C. Meny
    J. Phys.: Mater. 2, 015007 (2019).
    DOI: 10.1088/2515-7639/aaf540

  • Single-crystal growth and magnetic properties of Co-substituted Ca–La magnetoplumbite-type ferrite
    T. Waki, K. Uji, Y. Tabata, and H. Nakamura
    J. Solid State Chem. 270, 366-369 (2019).
    DOI: 10.1016/j.jssc.2018.11.036

2018

  • Orbital-order driven ferroelectricity and dipolar relaxation dynamics in multiferroic GaMo4S8
    K.Geirhos, S. Krohns, H. Nakamura, T. Waki, Y. Tabata, I. Kézsmárki, and P. Lunkenheimer
    Phys. Rev. B 98, 224306 (2018).
    DOI: 10.1103/PhysRevB.98.224306

  • Architecture of nanoscale ferroelectric domains in GaMo4S8
    E. Neuber, P. Milde, A. Butykai, S. Bordacs, H. Nakamura, T. Waki, Y. Tabata, K. Geirhos, P. Lunkenheimer, I. Kézsmárki, P. Ondrejkovic, J. Hlinka, and L. M. Eng
    J. Phys.: Condens. Matter 30, 445402/1-9 (2018).
    DOI: 10.1088/1361-648X/aae448/

  • Occupation sites and valence states of Co dopants in (La, Co)-codoped M-type Sr ferrite: 57Fe and 59Co nuclear magnetic resonance studies
    H. Sakai, T. Hattori, Y. Tokunaga, S. Kambe, H. Ueda, Y. Tanioku, C. Michioka, K. Yoshimura, K. Takao, A. Shimoda, T. Waki, Y. Tabata, and H. Nakamura
    Phys. Rev. B 98, 064403/1-10 (2018)
    DOI: 10.1103/PhysRevB.98.064403

  • Solid-state chemistry and physics of M-type ferrites as permanent magnet hosts and their recent research trend (in Japanese)
    H. Nakamura
    Magnetics Jpn. 13(2), 59-67 (2018)

  • Effect of oxygen potential on Co solubility limit in La–Co co-substituted magnetoplumbite-type strontium ferrite
    T. Waki, S. Okazaki, Y. Tabata, M. Kato, K. Hirota, and H. Nakamura
    Mater. Res. Bull. 104, 87-91 (2018)
    DOI: 10.1016/j.materresbull.2018.03.057

  • 57Fe Mössbauer and Co K_beta x-ray emission spectroscopic investigations of La-Co and La substituted strontium hexaferrite
    M. Oura, N. Nagasawa, S. Ikeda, A. Shimoda, T. Waki, Y. Tabata, H. Nakamura, N. Hiraoka, and H. Kobayashi,
    J. Appl. Phys. 123, 033907 (2018).
    DOI: 10.1063/1.5011244