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305-0047 1-2-1 Sengen Tsukuba Ibaraki JAPAN [Access]

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Research papers TSV

2022
  1. Kodai Niitsu, Yizhou Liu, Alexander C. Booth, Xiuzhen Yu, Nitish Mathur, Matthew J. Stolt, Daisuke Shindo, Song Jin, Jiadong Zang, Naoto Nagaosa, Yoshinori Tokura. Geometrically stabilized skyrmionic vortex in FeGe tetrahedral nanoparticles. Nature Materials. 21 [3] (2022) 305-310 10.1038/s41563-021-01186-x
  2. Zentaro Akase, Kenta Kimura, Tomohiro Saito, Kodai Niitsu, Toshiaki Tanigaki, Yoh Iwasaki, Parmanand Sharma, Akihiro Makino, Daisuke Shindo. Magnetic flux in soft magnetic Fe-Si-B-P-Cu amorphous alloy containing nanocrystallites analyzed by electron holography. Journal of Magnetism and Magnetic Materials. 541 (2022) 168519 10.1016/j.jmmm.2021.168519
2021
  1. Tetsuya Hamada, Masaya Higashi, Kodai Niitsu, Haruyuki Inui. Phase equilibria among <i>η</i>-Fe<sub>2</sub>Al<sub>5</sub> and its higher-ordered phases. Science and Technology of Advanced Materials. 22 [1] (2021) 373-385 10.1080/14686996.2021.1915691
  2. N. Hanasaki, M. Oda, K. Niitsu, K. Ehara, H. Murakawa, H. Sakai, H. Nitani, H. Abe, H. Sagayama, H. Uetsuka, T. Karube, H. Inui. Element dependence of local disorder in medium-entropy alloy CrCoNi. AIP Advances. 11 [12] (2021) 125216 10.1063/5.0072766
  3. Yuki Sugiura, Kodai Niitsu, Yasuko Saito, Takashi Endo, Masanori Horie. Inorganic process for wet silica-doping of calcium phosphate. RSC Advances. 11 [20] (2021) 12330-12335 10.1039/d1ra00288k
  4. Dengshan Zhou, Zhenghao Chen, Kazuki Ehara, Kodai Nitsu, Katsushi Tanaka, Haruyuki Inui. Effects of annealing on hardness, yield strength and dislocation structure in single crystals of the equiatomic Cr-Mn-Fe-Co-Ni high entropy alloy. Scripta Materialia. 191 (2021) 173-178 10.1016/j.scriptamat.2020.09.039
2020
  1. Kodai Niitsu, Makoto Asakura, Koretaka Yuge, Haruyuki Inui. Prediction of Face-Centered Cubic Single-Phase Formation for Non-Equiatomic Cr–Mn–Fe–Co–Ni High-Entropy Alloys Using Valence Electron Concentration and Mean-Square Atomic Displacement. MATERIALS TRANSACTIONS. 61 [9] (2020) 1874-1880 10.2320/matertrans.mt-m2020144
  2. Yuki Sugiura, Hideki Obika, Masanori Horie, Kodai Niitsu, Yoji Makita. Aesthetic Silver-Doped Octacalcium Phosphate Powders Exhibiting Both Contact Antibacterial Ability and Low Cytotoxicity. ACS Omega. 5 [38] (2020) 24434-24444 10.1021/acsomega.0c02868
  3. Kodai Niitsu. Temperature dependence of magnetic exchange stiffness in iron and nickel. Journal of Physics D: Applied Physics. 53 [39] (2020) 39LT01 10.1088/1361-6463/ab9672
  4. K. Niitsu, H. Date, R. Kainuma. Thermal activation of stress-induced martensitic transformation in Ni-rich Ti-Ni alloys. Scripta Materialia. 186 (2020) 263-267 10.1016/j.scriptamat.2020.05.010
  5. Ken Harada, Marek Malac, Misa Hayashida, Koudai Niitsu, Keiko Shimada, Darren Homeniuk, Marco Beleggia. Toward the quantitative the interpretation of hole-free phase plate images in a transmission electron microscope.. Ultramicroscopy. 209 (2020) 112875 10.1016/j.ultramic.2019.112875
  6. Hao Wang, Hongwei Geng, Dengshan Zhou, Kodai Niitsu, Ondrej Muránsky, Deliang Zhang. Multiple strengthening mechanisms in high strength ultrafine-grained Al–Mg alloys. Materials Science and Engineering: A. 771 (2020) 138613 10.1016/j.msea.2019.138613
  7. K. Niitsu, X. Xu, R. Y. Umetsu, R. Kainuma, K. Harada. Temperature dependence of exchange stiffness in an off-stoichiometric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="normal">N</mml:mi><mml:msub><mml:mi mathvariant="normal">i</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>MnIn</mml:mi></mml:mrow></mml:math> Heusler alloy. Physical Review B. 101 [1] (2020) 10.1103/physrevb.101.014443
2019
  1. Youngji Cho, Kodai Niitsu, Yoshihiro Midoh, Koji Nakamae, Daisuke Shindo, Jun-Mo Yang, Yasukazu Murakami. Suppressing Geometric Phase Shift Owing to Antiphase Boundaries in Dark-Field Electron Holography. MATERIALS TRANSACTIONS. 60 [5] (2019) 698-703 10.2320/matertrans.mc201809
  2. Nitish Mathur, Matthew J. Stolt, Kodai Niitsu, Xiuzhen Yu, Daisuke Shindo, Yoshinori Tokura, Song Jin. Electron Holography and Magnetotransport Measurements Reveal Stabilized Magnetic Skyrmions in Fe<sub>1–<i>x</i></sub>Co<sub><i>x</i></sub>Si Nanowires. ACS Nano. 13 [7] (2019) 7833-7841 10.1021/acsnano.9b02130
  3. Ken Harada, Kodai Niitsu, Keiko Shimada, Tetsuji Kodama, Tetsuya Akashi, Yoshimasa A Ono, Daisuke Shindo, Hiroyuki Shinada, Shigeo Mori. Electron holography on Fraunhofer diffraction. Microscopy. 68 [3] (2019) 254-260 10.1093/jmicro/dfz007
2018
  1. Ken Harada, Tetsuya Akashi, Kodai Niitsu, Keiko Shimada, Yoshimasa A. Ono, Daisuke Shindo, Hiroyuki Shinada, Shigeo Mori. Interference experiment with asymmetric double slit by using 1.2-MV field emission transmission electron microscope. Scientific Reports. 8 [1] (2018) 10.1038/s41598-018-19380-4
  2. K. Niitsu, T. Tanigaki, K. Harada, D. Shindo. Temperature dependence of 180° domain wall width in iron and nickel films analyzed using electron holography. Applied Physics Letters. 113 [22] (2018) 222407 10.1063/1.5056308
  3. K. Harada, K. Shimada, Y. A. Ono, Y. Iwasaki, K. Niitsu, D. Shindo. Electron holography study on vortex beam phases in real space. Microscopy and Microanalysis. 24 [S1] (2018) 1470-1471 10.1017/s1431927618007833
  4. K. Niitsu, A. Sato, T.T. Sasaki, R. Sawada, Y. Cho, Y. Takada, T. Sato, Y. Kaneko, A. Kato, T. Ohkubo, D. Shindo, K. Hono, Y. Murakami. Magnetization measurements for grain boundary phases in Ga-doped Nd-Fe-B sintered magnet. Journal of Alloys and Compounds. 752 (2018) 220-230 10.1016/j.jallcom.2018.04.055
  5. Kiyou Shibata, Toshiaki Tanigaki, Tetsuya Akashi, Hiroyuki Shinada, Ken Harada, Kodai Niitsu, Daisuke Shindo, Naoya Kanazawa, Yoshinori Tokura, Taka-hisa Arima. Current-Driven Motion of Domain Boundaries between Skyrmion Lattice and Helical Magnetic Structure. Nano Letters. 18 [2] (2018) 929-933 10.1021/acs.nanolett.7b04312
  6. Kodai Niitsu, Yuta Kimura, Toshihiro Omori, Ryosuke Kainuma. Cryogenic superelasticity with large elastocaloric effect. NPG Asia Materials. 10 [1] (2018) e457-e457 10.1038/am.2017.213
2017
  1. Toshiaki Tanigaki, Tetsuya Akashi, Akira Sugawara, Katsuya Miura, Jun Hayakawa, Kodai Niitsu, Takeshi Sato, Xiuzhen Yu, Yasuhide Tomioka, Ken Harada, Daisuke Shindo, Yoshinori Tokura, Hiroyuki Shinada. Magnetic field observations in CoFeB/Ta layers with 0.67-nm resolution by electron holography. Scientific Reports. 7 [1] (2017) 10.1038/s41598-017-16519-7
  2. Kodai Niitsu, Yuta Kimura, Ryosuke Kainuma. Transformation entropy change and precursor phenomena in Ni-rich Ti–Ni shape memory alloys. Journal of Materials Research. 32 [20] (2017) 3822-3830 10.1557/jmr.2017.377
  3. R. Sawada, T. Yamamoto, K. Minakuchi, M. Nagasako, Y. Hayasaka, K. Niitsu, Y. Cho, R. Kainuma, Y. Murakami. Cellular microstructures superposed on martensite plates in Mn 55.2 Ga 19.0 Cu 25.8 alloy showing large coercivity. Scripta Materialia. 135 (2017) 33-36 10.1016/j.scriptamat.2017.03.013
  4. Hiroaki Suzuki, Zentaro Akase, Kodai Niitsu, Toshiaki Tanigaki, Daisuke Shindo. Secondary electron effect on electron beam induced charging of SiO2particle analyzed by electron holography. Microscopy. (2017) 10.1093/jmicro/dfw112
  5. K. Niitsu, K. Minakuchi, X. Xu, M. Nagasako, I. Ohnuma, T. Tanigaki, Y. Murakami, D. Shindo, R. Kainuma. Atomic-resolution evaluation of microsegregation and degree of atomic order at antiphase boundaries in Ni 50 Mn 20 In 30 Heusler alloy. Acta Materialia. 122 (2017) 166-177 10.1016/j.actamat.2016.09.035
2016
  1. Yuta Kimura, Xiao Xu, Kodai Niitsu, Toshihiro Omori, Ryosuke Kainuma. Martensitic Transformations and Superelastic Behavior at Low Temperatures in Ti&lt;sub&gt;50&amp;minus;&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;Ni&lt;sub&gt;40+&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;Cu&lt;sub&gt;10&lt;/sub&gt; Shape Memory Alloys. MATERIALS TRANSACTIONS. 57 [3] (2016) 269-277 10.2320/matertrans.mb201504
  2. Yasukazu Murakami, Kodai Niitsu, Syuhei Kaneko, Toshiaki Tanigaki, Taisuke Sasaki, Zentaro Akase, Daisuke Shindo, Tadakatsu Ohkubo, Kazuhiro Hono. Strain measurement in ferromagnetic crystals using dark-field electron holography. Applied Physics Letters. 109 [19] (2016) 193102 10.1063/1.4967005
  3. Toshiaki Tanigaki, Ken Harada, Yasukazu Murakami, Kodai Niitsu, Tetsuya Akashi, Yoshio Takahashi, Akira Sugawara, Daisuke Shindo. New trend in electron holography. Journal of Physics D: Applied Physics. 49 [24] (2016) 244001 10.1088/0022-3727/49/24/244001
2015
  1. K. Niitsu, Y. Kimura, X. Xu, R. Kainuma. Composition Dependences of Entropy Change and Transformation Temperatures in Ni-rich Ti–Ni System. Shape Memory and Superelasticity. 1 [2] (2015) 124-131 10.1007/s40830-015-0023-2
2014
  1. Kodai Niitsu, Ryosuke Kainuma. Effect of annealing on stress-induced transformation behaviors at low temperatures in a Ti-51.8 at.% Ni shape memory alloy. physica status solidi (b). 251 [10] (2014) 2041-2047 10.1002/pssb.201350418
  2. Y. Murakami, K. Niitsu, T. Tanigaki, R. Kainuma, H. S. Park, D. Shindo. Magnetization amplified by structural disorder within nanometre-scale interface region. Nature Communications. 5 [1] (2014) 10.1038/ncomms5133
2011
  1. Kodai Niitsu, Toshihiro Omori, Ryosuke Kainuma. Superelasticity at Low Temperatures in Cu-17Al-15Mn (at%) Shape Memory Alloy. MATERIALS TRANSACTIONS. 52 [8] (2011) 1713-1715 10.2320/matertrans.m2011128
  2. K. Niitsu, T. Omori, M. Nagasako, K. Oikawa, R. Kainuma, K. Ishida. Phase transformations in the B2 phase of Co-rich Co–Al binary alloys. Journal of Alloys and Compounds. 509 [6] (2011) 2697-2702 10.1016/j.jallcom.2010.11.130

Books TSV

Proceedings TSV

Presentations TSV

Misc TSV

Patents TSV

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