Faculty Profiles - NAKANISHI Makoto

MISC - NAKANISHI Makoto

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Development of nanograined hexagonal barium ferrite thin films by sol-gel technique

Nimai Chand Pramanik, Tatsuo Fujii, Makoto Nakanishi, Jun Takada

Materials Letters 59 ( 4 ) 468 - 472 2005

Nanograined hexagonal barium ferrite (BaFe O ) thin films have been developed on naturally oxidized Si substrates by sol-gel technique using aqueous solution of metal chlorides. Coated films were heat treated at different temperatures ranging from 450 to 900°C, and all the films were characterized by using X-ray diffraction (XRD), inductive coupled plasma (ICP) spectroscopy, and field emission scanning electron microscopy (FESEM). The effects of temperature on the formation of BaFe O thin film were studied, and it was observed that hexagonal barium ferrite thin films with grain sizes of about 50 nm were formed above 700°C. Study on the magnetic properties of the films by vibrating sample magnetometer (VSM) showed that films exhibited large saturation magnetization and high coercivity in the range 247-355 emu/cm and 2.70-4.22 kOe, respectively, while the Curie temperatures (□ ) were in the range 443-457°C. The effects of temperatures on the magnetic properties were also studied. © 2004 Elsevier B.V. All rights reserved. 12 19 12 19 c 3

DOI： 10.1016/j.matlet.2004.10.026

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The influence of the impurity element and the heat temperature upon the traditional Japanese red color pigment "bengara"

Hiroshi Asaoka, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yoshihiro Kusano, Ryu Murakami

C e Ca 35 ( 2 ) 85 - 91 2005

Magnetic properties of La-Co substituted M-type Sr-ferrite fine powders prepared by the citrate process

KIKUCHI T., NAKAMURA T., NAKANISHI M., FUJII T., TAKADA J., IKEDA Y., MIKI M.

28 419 - 419 2004.9

新規広帯域高周波帯電磁波吸収体の研究開発

高田潤, 中西真, 藤井達生

機械の研究vol.56, no.5, pp.536-542 vol.56, no.5, pp.536-542 ( 5 ) 536 - 542 2004

Crystalline Control of Bincho Charcoal by using Catalytic Graphitization and Electromagnetic Wave Absorption Characteristics of Derived Carbon（共著）

Yukiko Uchida, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Akinori Muto, Yusaku Sakata, Yoshihiro Kusano, Takeyuki Kikuchi

Transactions of the Materials Research Society of Japan 29 2511 - 2514 2004

Ilmenite-hematite solid solution films for novel electronic devices

Tatsuo Fujii, Masakazu Kayano, Yusuke Takada, Makoto Nakanishi, Jun Takada

Solid State Ionics 172 ( 1-4 SPEC. ISS. ) 289 - 292 2004

Unique magnetic and electric properties of solid solutions of ilmenite (FeTiO ) and hematite (α-Fe O ) can be expected for new electronics, optics and spintronics applications. We have successfully prepared well-crystallized and epitaxial Fe Ti O (001) films on α-Al O (001) substrates by reactive helicon plasma-sputtering technique. Structure, magnetic and electric properties of the films were seriously dependent on both the oxygen pressure and the substrate temperature during the sputtering deposition. The subsequent annealing of the films in vacuum at high temperature (600 °C) promoted the order (R3̄) structure of Fe Ti O , where the Ti and Fe ions occupied the cation sites alternatively along the c-axis. Only the films having the R3̄ symmetry had large ferrimagnetic moments at low temperature (78 K), although the magnetization values were depending on not only the order parameter between the R3̄ and the R3̄c structures but also the oxidization states of Fe ions in Fe Ti O . The film prepared at an oxygen partial pressure ratio of 1.4% and substrate temperature of 400 °C had considerably large spontaneous magnetization of 275 emu/cm at 78 K after the subsequent annealing at 600 °C. However, highly oxidized nonstoichiometirc Fe Ti O films with the R3̄c symmetry could not give the ordered structure with the R3̄ symmetry. © 2004 Elsevier B.V. All rights reserved. 3 2 3 1.23 0.77 3+δ 2 3 1.23 0.77 3+δ 1.23 0.77 3+δ 1.23 0.77 3+δ 3

DOI： 10.1016/j.ssi.2004.02.051

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Effect of Co²⁺ ion on the magnetic properties of sol-gel cobalt ferrite thin films

Nimai Ch Pramanik, Tatsuo Fujii, Makoto Nakanishi, Jun Takada

Journal of Materials Chemistry 14 ( 22 ) 3328 - 3332 2004

The effect of Co ion on the magnetic properties of the sol-gel derived cobalt ferrite thin films (400 nm thickness) was studied. Films with different solution composition ([Co ]/[Fe ] = 0.5-1.0) were deposited on a Si substrate from the precursor containing an aqueous solution of FeCl ·6H O and CoCl · 6H O. Deposited films were heat treated at different temperatures (700-1100 °C) and were characterized by X-ray diffraction using Cu Kα radiation. The films containing a nonstoichiometric α-(Fe Co ) O phase were obtained in addition to a small amount of CoO at relatively lower temperatures. With increasing heat treatment temperature, nonstoichiometric α-(Fe Co ) O was decomposed to stoichiometric α-Fe O and the CoFe O phase was intensified. Only the films obtained from the solution enriched with Co showed the single phase of CoFe O , though the Co to Fe content ratio analyzed by inductive coupled plasma spectroscopy (ICP) and energy dispersive X-ray spectroscopy (EDX) was nearly consistent with that of the starting solutions. The study of surface morphology of the films by using field emission scanning electron microscope (FESEM) showed that films were homogeneously distributed throughout the surface of the substrate and the grain sizes were in the range of 60 to 140 nm. Magnetic properties of the films, including the Curie temperature, were studied by using a vibrating sample magnetometer (VSM) and conversion electron Mössbauer spectroscopy (CEMS). The Curie temperature and the magnetic hyperfine fields of the films slightly decreased with increasing molar ratio of the Co and Fe ions while the saturation magnetization reached a maximum value with the film composition of x = 0.28. 2+ 2+ 3+ 2+ 3+ 3 2 2 2 1-x x 2 3 1-x x 2 3 2 3 2 4 2 4

DOI： 10.1039/b410163d

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Preparation of Y-type hexagonal ferrite's films by polymerized complex method

K. Komatsu, M. Nakanishi, T. Fujii, J. Takada

Journal of Magnetism and Magnetic Materials 272-276 ( SUPPL. 1 ) 2004

Well-crystallized Y-type hexagonal ferrite films with highly c-axis orientation were successfully prepared on Ag, Au and Pt substrates by polymerized complex method. The films prepared on Ag had considerably low formation temperature of 800°C, while those on An and Pt were formed at above 1000°C. The films had large in-plane magnetic anisotropy, with small coercivity. Hexagonal grains structures were developed on the substrates. © 2003 Published by Elsevier B.V.

DOI： 10.1016/j.jmmm.2003.12.885

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Preparation and characterization of epitaxial FeTiO<inf>3+λ</inf> films

Tatsuo Fujii, Masakazu Kayano, Yusuke Takada, Makoto Nakanishi, Jim Takada

Journal of Magnetism and Magnetic Materials 272-276 ( III ) 2010 - 2011 2004

Epitaxial FeTiO (001) films were prepared on α-Al O (001) substrates by helicon plasma sputtering technique. Structure and magnetic properties of FeTiO film were largely dependent on the residual oxygen pressure (Po ) during the sputtering deposition. The films prepared at lower Po had an ilmenite (R3̄) structure, while a corundum (R3̄c) structure was observed in the case of higher Po . The oxidation state of Fe in FeTiO films changed monotonically from Fe to Fe with increasing the Po . The films with the R3̄ symmetry were ferrimagnitic at low temperature, while the nonstoichiometric FeTiO with the R3̄c symmetry were antiferromagnetic at room temperature. © 2003 Elsevier B.V. All rights reserved. 3+λ 2 3 3+λ 2 2 2 3+λ 2 3+λ 2+ 3+

DOI： 10.1016/j.jmmm.2003.12.793

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814 吹屋ベンガラのキャラクタリゼーションとその再現(表面改質・色彩評価,一般セッション,第53期学術講演会)

浅岡裕史, 中西真, 藤井達生, 高田潤

学術講演会講演論文集 53 228 - 228 2004

807 高周波用Y型六方晶フェライト薄膜の作製と磁気特性(薄膜物性,一般セッション,第53期学術講演会)

小松幸太郎, 中西真, 藤井達生, 高田潤

学術講演会講演論文集 53 215 - 215 2004

810 フェライト/SiC複合焼結体の作製と電磁波吸収特性(セラミックスの物性評価,一般セッション,第53期学術講演会)

中西真, 小倉和生, 藤井達生, 高田潤

学術講演会講演論文集 53 220 - 221 2004

Electronic States of Iron-Titanium Oxides Analyzed by Photelectron Spectroscopy

Fujii T., Kayano M., Takada Y., Nakanishi M., Takada J., Ito Y., Kimura M., Vlaicu M. A., Yoshikawa H., Fukushima S., Tanaka A.

Meeting abstracts of the Physical Society of Japan 58 ( 2 ) 528 - 528 2003.8

Electronic States of Epitaxial FeTiO_3 Films

Fujii T., Kayano M., Takada Y., Nakanishi M., Takada H., Oohashi H., Shigeoka N., Ito Y., Kimura M., Vlaicu M. A., Yoshikawa H., Fukushima S., Tanaka A., Yamashita M.

Meeting abstracts of the Physical Society of Japan 58 ( 1 ) 475 - 475 2003.3

Characterization and Reproduction of "Fukiya Bengara", Noble Red Color Pigment, by Fe<inf>2</inf>O<inf>3</inf>-Al<inf>2</inf>O<inf>3</inf> System

Hiroshi Asaoka, Yoshihiro Kusano, Makoto Nakanishi, Tatsuo Fujii, Jun Takada

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 50 ( 12 ) 1062 - 1067 2003

Human beings have been using "bengara" (α-Fe O ) as red pigment ever since ancient times. As for Japan, the first artificial "bengara" was manufactured at Fukiya town in 1707, and it was mainly used for red painting of porcelain and other objects for about 300 years. However this "Fukiya bengara" cannot be manufactured anymore because of the environment pollution in spite of eagerness of potters to use it for producing bright yellowish red. At first step, we characterized traditional "Fukiya bengara" and found that α-Al O existed. It is probably due to the formation of Al substituted α-Fe O . Then next step, we prepared red pigment of Fe O -Al O system to investigate the Al substitution effect, by using both solid-state and polymerized complex methods. The red tone color depended on the particle size; the yellowish red pigment had the smallest size. Al substitution seemed to suppress the grain growth of hematite. The red tone color was controllable with the amount of Al substitution. α-(Fe Al ) O prepared at 1000°C for 2 hours presented as bright yellowish red color as that of "Fukiya Bengara". 2 3 2 3 2 3 2 3 2 3 0.9 0.1 2 3

DOI： 10.2497/jjspm.50.1062

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Microstructure and formation mechanism of fire-make pattern on Japanese traditional “BIZEN” earthenware

Y. Kusano, A. Doi, M. Nakanishi, T. Fujii, J. Takada, M. Fukuhara, R. Murakami

Proceedings of 10th International Ceramics Congress, Science for New Technology of Silicate Ceramics 2003

The influence of the additional element and the heat temperature upon traditional red color pigment

ASAOKA H.

10^<th> International Ceramics Congress International Symposium (CIMTEC 2002), Techna Srl 63 - 68 2003

Phase separation of T' solid solution in the Pr-La-Cu-O system (III)

Ikeda Y, Yamada K, Kusano Y, Nakanishi M, Takada J

Meeting abstracts of the Physical Society of Japan 57 ( 2 ) 480 - 480 2002.8

24pPSA-24 Phase separation of T' solid solution in the Pr-La-Cu-O system (II )

Ikeda Y., Yamada K., Kusano Y., Nakanishi M., Takada J.

Meeting abstracts of the Physical Society of Japan 57 ( 1 ) 512 - 512 2002.3

Synthesis and Properties of Pb-Doped Bi-2212 Phase

Y. Kusano, A.Doi, M.Nakanishi, T.Fujii, J.Tadkada, Y.Ikeda, M.Takano

Key Engineering Materials 2002

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