Faculty Profiles - NAKANISHI Makoto

MISC - NAKANISHI Makoto

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プレセラミックス法によるフェライト系複合材料の作製と電波吸収特性

高田潤, 中西真, 藤井達生

日本応用磁気学会誌 2002

Low-temperature growth of c-axis-oriented Y-type hexagonal ferrite thin films by the polymeric precursor method

Tatsuo Fujii, Aiko Harano, Makoto Nakanishi, Jun Takada

Journal of Materials Research 16 ( 9 ) 2471 - 2474 2001

Well-crystallized Ba Zn Fe O (Zn -Y) films with high c-axis oritentation were successfully formed on Ag substrates at low temperature by the polymeric precursor method. A precursor solution with stoichiometric Ba , Zn , and Fe ions was deposited on the substrates by a dip-coating. The films were then heat-treated at temperatures ranging from 700 to 900°C. The crystallization process of c-axis-oriented Zn -Y films occurred at the considerably low temperature of 750°C, though a small amount of spinel oxides contaminated them. The films had hexagonal grain structures which were developed by increasing the heat-treatment temperature. Magnetization curves of the Zn -Y film heated at 900°C clearly indicated that the film had large in-plane magnetic anisotropy and had small in-plane coercivity. 2 2 12 22 2 2 2 2+ 2+ 3+

DOI： 10.1557/JMR.2001.0338

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Exchange coupling and spin-flip transition of CoFe<inf>2</inf>O<inf>4</inf>/α-Fe<inf>2</inf>O<inf>3</inf> bilayered films

Tatsuo Fujii, Takuya Yano, Makoto Nakanishi, Jun Takada

Materials Research Society Symposium - Proceedings 674 2001

CoFe O /α-Fe O (ferrimagnetic/antiferromagnetic) bilayered films were prepared on α-Al O (102) single-crystalline substrates by helicon plasma sputtering. A well-crystallized epitaxial α-Fe O (102) layer was formed on the substrate, while CoFe O grown on α-Fe O (102) was a polycrystalline layer with a (100)-preferred orientation. The α-Fe O (102) films without CoFe O layers clearly showed a spin-flip transition at about 400 K. The spins aligned perpendicular to the film plane at room temperature changed their direction within the film plane above 400 K. However the α-Fe O base layers of CoFe O /α-Fe O bilayered films did not show any spin-flip transition. The CoFe O layer on α-Fe O had a large in-plane magnetic anisotropy, while the spin axis of the α-Fe O (102) base layer was directed perpendicular to the film plane. The magnetization of ferrimagnetic CoFe O layers was coupled perpendicularly to the spin axis of antiferromagnetic α-Fe O layers due to the exchange coupling at the interface between CoFe O and α-Fe O . 2 4 2 3 2 3 2 3 2 4 2 3 2 3 2 4 2 3 2 4 2 3 2 4 2 3 2 3 2 4 2 3 2 4 2 3

DOI： 10.1557/proc-674-t1.10

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Introduction of Flux Pining Centers in Bi-based Superconductors by Heavy Ion Irradiation.

高田潤, 菊池丈幸, 中西真, 藤井達生, 長江正寛, 草野圭弘, 池田靖訓, 安田仲宏, 村上健

NIRS-M (Natl Inst Radiol Sci) ( 139 ) 203 - 204 2000.4

Preparation and absorption characteristics of Ni-Zn ferrite/SiC sintered composites prepared by pre-ceramics method

Makoto Nakanishi, Masaki Yoshino, Tatsuo Fujii, Jun Takada, Minoru Fukuhara

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 47 ( 8 ) 927 - 930 2000

Language：Japanese Publisher：Funtai Funmatsu Yakin Kyokai

Ni-Zn ferrite/SiC sintered composite was prepared as electromagnetic wave absorber through pre-ceramics method and subsequent annealing at 1273 K. Amorphous SiC particles dispersed uniformly in Ni-Zn ferrite matrix and the density of the composites decreased with increasing the amount of SiC particles. The absorption characteristics of the sintered composite were found to depend upon the amount of SiC particles. The matching frequency of the composites shifted toward higher frequency, from about 100 MHz to 1 GHz, with increasing the amount of SiC particles.

DOI： 10.2497/jjspm.47.927

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Preparation and absorption characteristics of Ni-Zn ferrite/SiC sintered composites prepared by pre-ceramics method

Makoto Nakanishi, Masaki Yoshino, Tatsuo Fujii, Jun Takada, Minoru Fukuhara

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 47 ( 8 ) 927 - 930 2000

Language：Japanese Publisher：Funtai Funmatsu Yakin Kyokai

DOI： 10.2497/jjspm.47.927

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Preparation of CoFe_2O_4/α-Fe_2O_3 bilayered films by helicon plasma sputtering

YANO T., FUJII T., NAKANISHI M., TAKADA J

23 20 - 20 1999.10

Introduction of Flux Pining Centers in Bi-based Superconductors by Heavy Ion Irradiation.

高田潤, 菊池丈幸, 中西真, 長江正寛, 草野圭弘, 池田靖訓, 高野幹夫, 安田仲宏, 村上健

NIRS-M (Natl Inst Radiol Sci) ( 133 ) 211 - 212 1999.4

Structure and Magnetism of V_XNbS_<2-δ>

MATSUNO Yukiyasu, NAKANISHI Makoto, FUJII Tatsuo, TAKADA Jun

Meeting abstracts of the Physical Society of Japan 53 ( 2 ) 475 - 475 1998.9

LiドープBi2212相に関する分光学的研究

高田潤, 中西真, 菊池丈幸, 藤井達生, 長田実, 垣花真人

東京工業大学応用セラミックス研究所共同利用研究報告書 1997 74 1998.9

Lithium Intercalation/Deintercalation of the Bi-2212 Phase by Electrochemical Method

Makoto Nakanishi, Yoshiaki Uwazumi, Masashi Fujiwara, Jun Takada, Yoshihiro Kusano, Yasuo Takeda, Yasunori Ikeda

Journal of the Japan Society of Powder and Powder Metallurgy 45 ( 7 ) 666 - 669 1998

Language：Japanese Publisher：Japan Society of Powder and Powder Metallurgy

The effects of electrochemical removal reaction of lithium from the Li-doped Bi-2212 phase on its structure and superconducting properties have been studied. Lithium was inserted into and removed from Bi₂Sr_1.5Ca_1.5Cu₂O_z through an electrochemical. method at a constant applied potential at room temperature. The original crystal symmetry, tetragonal structure, was maintained and any secondary phase was not formed throughout the electrochemical reactions. Lattice parameter c of the doped samples, Li_xBi₂Sr_1.5Ca_1.5Cu₂O_z, decreased and Tc changed reversibly as the lithium content x decreased, It reveals that the electrochemical reactions were intercalation/deintercalation of the Bi-2212 phase with lithium.

DOI： 10.2497/jjspm.45.666

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Other Link： https://jlc.jst.go.jp/DN/JALC/00054393127?from=CiNii

Preparation of FeTiO_3-α-Fe_2O_3 solid solution films by reactive evaporation method

FUJII T., AYAMA K., NAKANISHI M., TAKADA J.

21 457 - 457 1997.10

28a-PS-82 Magnetic transitions of vanadium chalcogenides II

Nakanishi M., Fujii T., Takada J., Yoshimura K., Kosuge K., Goto T.

Meeting abstracts of the Physical Society of Japan 52 ( 1 ) 424 - 424 1997.3

Li Doping into the Pb substituted Bi-2212 Phase by Electrochemical Method

Hirofumi Joko, Masashi Fujiwara, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yoshihiro Kusano, Yasuo Takeda, Yasunori Ikeda, Mikio Takano, Yoshichika Bando

Journal of the Japan Society of Powder and Powder Metallurgy 44 ( 8 ) 792 - 796 1997

Effects of electrochemical Li-doping to the Pb-substituted Bi-2212 phase on its structural and superconducting properties were studied. Bi Pb Sr Ca Cu O was lithiated through an electrochemical method at constant applied potential at room temperature. In the electrochemically Li-doping samples, the original crystal symmetry, tetragonal structure, was maintained and any secondary phase was not formed. The amount of doped Li for Bi Pb Sr Ca Cu O was much lager than that for Bi Sr Ca Cu O at the same reaction periods. Analysed maximum Li content y for Li Bi Pb Sr Ca Cu O was found to be 0.53, which was remarkably high in comparison with y=0.37 for Li Bi Sr Ca Cu O . The lattice parameters (a,c) of Li Bi Pb Sr Ca Cu O increased continuously in a similar trend to that of Li Bi Sr Ca Cu O . Tc remains almost constant around 85K as the Li content y increased. 1.8 0.2 1.5 1.5 2 z 1.8 0.2 1.5 1.5 2 z 2 1.5 1.5 2 z y 1.8 0.2 1.5 1.5 2 z y 2 1.5 1.5 2 z y 1.8 0.2 1.5 1.5 2 z y 2 1.5 1.5 2 z

DOI： 10.2497/jjspm.44.792

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Phase diagram and physical property of Yb-Cu system. III.

辻井直人, 何軍輝, 中西真, 吉村一良, 小菅こう二

粉体粉末冶金協会講演概要集 1997 1997