研究者詳細 - 谷山　智康

論文 - 谷山　智康

分割表示 236 件中 201 - 220 件目／全件表示 >>

Control of magnetic anisotropy and magnetotransport in epitaxial micropatterned (Ga,Mn)As wire structures 査読有り国際誌

K Hamaya, R Moriya, A Oiwa, T Taniyama, Y Kitamoto, H Munekata

IEEE TRANSACTIONS ON MAGNETICS 39 巻 ( 5 ) 頁： 2785 - 2787 2003年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

The authors present magnetoresistance characteristics of patterned (Ga,Mn)As wire structures, which depend on wire width and thus overall magnetic anisotropy. Cubic and uniaxial magnetocrystalline anisotropies seem to be the, dominant magnetic contributions in 2-mum-wide wires, whereas both magnetocrystalline and shape-induced anisotropies, contribute to magnetization reversal in 1mum-wide wires, as manifested by jumps in the magnetoresistance curves. The role of these two anisotropies in the magnetization reversal is discussed, together with the determination of magnetic easy/hard axes of (Ga,Mn)As wires.

DOI： 10.1109/TMAG.2003.815710

Web of Science

Scopus

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Anomalous hall resistivity due to grain boundary in manganite thin films 査読有り国際誌

T. Taniyama, K. Hamaya, Y. Kitamoto, Y. Yamazaki

Journal of Applied Physics 93 巻 ( 10 ) 頁： 8107 - 8109 2003年5月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The anomalous Hall resistivities of polycrystalline manganite thin films with different grain sizes were analyzed. Positive anomalous Hall coefficients due to grain boundaries were observed in addition to a negative contribution in the bulk manganite. The temperature dependence of the anomalous Hall resistivity was found to be in agreement with its magnetoresistive feature.

DOI： 10.1063/1.1543865

Cation order and magnetic properties of double perovskite Sr2FeMoO6 査読有り国際誌

H Sakuma, T Taniyama, Y Kitamoto, Y Yamazaki

JOURNAL OF APPLIED PHYSICS 93 巻 ( 5 ) 頁： 2816 - 2819 2003年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER INST PHYSICS

A double perovskite. type compound Sr2FeMoO6 was synthesized by a solid-state reaction. The order parameter (x) of Fe and Pt ions on the B sites increased from 68% to 82% and the spontaneous magnetization at 5 K increased from 2.1 to 3.0 mu(B) per formula unit by lowering the calcination temperature from 1100 to 500degreesC. The dependence of the spontaneous magnetization on x was discussed using two models considering the local magnetic interactions between ions on the B sites. Fe-57 Mossbauer analysis suggested the existence of tiny areas of SrFeO3-delta in Sr2FeMoO6. (C) 2003 American Institute of Physics.

DOI： 10.1063/1.1544088

Web of Science

J-GLOBAL

Asymmetric transport due to spin injection into a Kondo alloy 査読有り国際誌

T Taniyama, N Fujiwara, Y Kitamoto, Y Yamazaki

PHYSICAL REVIEW LETTERS 90 巻 ( 1 ) 頁： 016601/1 - 4 2003年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMERICAN PHYSICAL SOC

Spin injection is found to have a significant effect on the transport properties of the Kondo alloy Cu(Fe). When a spin-polarized electron current flows from Co into Cu(Fe) wires through the Co/Cu(Fe) interface, the resistivity of the Cu(Fe) wire is suppressed near the interface, as distinct from the ordinary logarithmic increase in the resistivity at low temperatures. For the opposite current direction, no significant changes are observed. The asymmetry of the resistivity with respect to the current direction decays with a characteristic length of 1.5+/-0.4 mum at 2.5 K as the distance from the interface is increased. Possible mechanisms for the asymmetry are discussed.

DOI： 10.1103/PhysRevLett.90.016601

Web of Science

Optical studies of spin injection and detection at ferromagnet/semiconductor interfaces 国際誌

J.A.C. Bland, S.J. Steinmuller, A. Hirohata, W.S. Cho, Y.B. Xu, C.M. Guertler, G. Wastlbauer, A. Inonescu, T. Taniyama, T. Trypiniotis

Europhys. News 34 巻 ( 6 ) 頁： 240 2003年

FePt nanoparticle-assembly for magnetic recording media 査読有り

Kitamoto Y, Sakuma H, Jogo A, Taniyama T, Yamazaki Y, Nishio H, Yamamoto H

MAGNETIC MATERIALS, PROCESSES, AND DEVICES VII AND ELECTRODEPOSITION OF ALLOYS, PROCEEDINGS 2002 巻 ( 27 ) 頁： 483-490 2003年

Crossover of magnetotransport process toward spin-polarized tunneling in manganite thin films 査読有り国際誌

T Taniyama, M Yamasaki, Y Yamazaki

APPLIED PHYSICS LETTERS 81 巻 ( 24 ) 頁： 4562 - 4564 2002年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER INST PHYSICS

We report on the magnetoresistive features of well-characterized polycrystalline manganite thin films as a function of film thickness. A crossover of the magnetization process from domain wall displacement to magnetic rotation of each grain is observed around a thickness of 25 nm, accompanied with the maximum of the coercivity. The thickness dependence of the electrical resistivity clearly distinguishes the transport mechanism at 25 nm, below which the magnetoresistance can be well scaled by similar to(M/M-S)(2), using the magnetization M and the saturation magnetization M-S. Spin-polarized tunneling transport between adjacent grains provides a comprehensive picture for the magnetotransport data. (C) 2002 American Institute of Physics.

DOI： 10.1063/1.1528282

Web of Science

CiNii Research

J-GLOBAL

Surface magnetism of Pd-Fe fine particles 査読有り国際誌

T Shinohara, M Shigemune, T Sato, T Taniyama

IEEE TRANSACTIONS ON MAGNETICS 38 巻 ( 5 ) 頁： 2634 - 2636 2002年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Magnetization and ac susceptibility measurements of Pd98.0Fe2.0 fine particles (average radii of 7.6-20.4 nm) gave the evidence of magnetic ordering of the surface layer in fine particle. The magnetic transition temperature of the surface layer in Pd-Fe fine particles was determined to be about 40 K based on the peaks in nonlinear susceptibility, and it slightly decreased with decreasing the particles size. Moreover, the size dependence of saturation magnetization indicates that the surface layer has no saturation magnetization at low temperature.

DOI： 10.1109/TMAG.2002.801968

Web of Science

J-GLOBAL

Change in resistance of CuFe wires induced by spin injection 査読有り国際誌

T. Taniyama, N. Fujiwara, Y. Kitamoto, Y. Yamazaki

IEEE Transactions on Magnetics 38 巻 ( 5 I ) 頁： 2872 - 2874 2002年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Spin injection from a ferromagnetic metal Co into a Kondo alloy CuFe is demonstrated using the devices with a Co/CuFe wire junction. The temperature dependent resistivity of CuFe shows an increase below 20 K as spin current flows from CuFe into Co as seen in Kondo alloys. In contrast, the resistivity for the opposite current direction from Co into CnFe decreases at low temperatures at a current of 250 μA. The difference between the resistivities of both the current directions logarithmically increases with decreasing temperature, indicating the suppression of the spin scattering at Fe impurities that causes the logarithmic increase in Kondo alloys.

DOI： 10.1109/TMAG.2002.803135

Web of Science

Scopus

J-GLOBAL

Magneto-optical properties and morphology of particulate film consisting of Bi-YIG coprecipitated particles 査読有り

Kuroda CS, Taniyama T, Kitamoto Y, Yamazaki Y

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 241 巻 ( 2-3 ) 頁： 201-206 2002年3月

Strain-induced anisotropic low-field magnetoresistance of La-Sr-Mn-O thin films 査読有り

Choi KK, Taniyama T, Yamazaki Y

JOURNAL OF APPLIED PHYSICS 90 巻 ( 12 ) 頁： 6145-6150 2001年12月

Selective dry etching of manganite thin films for high sensitive magnetoresistive sensors 査読有り

Naoe M, Hamaya K, Fujiwara N, Taniyama T, Kitamoto Y, Yamazaki Y

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 235 巻 ( 1-3 ) 頁： 223-226 2001年10月

Improvement in magneto-optical properties of Bi-YIG particulate films by reduction in particle size 査読有り

Kuroda CS, Taniyama T, Kitamoto Y, Yamazaki Y, Hirano T

IEEE TRANSACTIONS ON MAGNETICS 37 巻 ( 4 ) 頁： 2432-2434 2001年7月

Magnetotransport and Mossbauer study of Fe3O4/gamma Fe2O3 granular thin films 査読有り

Taniyama T, Kitamoto Y, Yamazaki Y

JOURNAL OF APPLIED PHYSICS 89 巻 ( 11 ) 頁： 7693-7695 2001年6月

Magnetoresistance of manganite thin films induced by reaction with substrate 査読有り Open Access

Hamaya K, Taniyama T, Yamazaki Y

JOURNAL OF APPLIED PHYSICS 89 巻 ( 11 ) 頁： 6320-6323 2001年6月

X-ray magnetic circular dichroism of PdFe fine particles at Pd L-2,L-3 edges 査読有り

Shinohara T, Sato T, Taniyama T, Sakurai H

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 226 巻頁： 1939-1941 2001年5月

Magnetotransport and spin con-figurations in patterned ferromagnetic wires 査読有り

Taniyama T, Nakatani L, Yakabe T, Nomura A, Shiiki K, Yamazaki Y

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 226 巻頁： 1850-1852 2001年5月

Iron mixed-valence compounds, BaSm(Cu0.5+xFe0.5-x)(2)O5+delta II: The Fe2.5+ state and magnetic properties 査読有り

Linden J, Nakamura J, Pietari T, Taniyama T, Karppinen M, Yamauchi H

PHYSICA C 338 巻 ( 1-2 ) 頁： 126-131 2000年8月

Magnetic properties, oxygen content and metal valences in BaRE(Cu0.5Fe0.5)(2)O5+delta with RE = Lu, Yb, Y, Eu, Sm, Nd and Pr 査読有り

Kochi M, Linden J, Taniyama T, Lehmus K, Karppinen M, Yamauchi H

PHYSICA C 338 巻 ( 1-2 ) 頁： 132-136 2000年8月

Magnetic and magneto-transport properties of gamma Fe2O3-grain-embedded Fe3O4 thin films 査読有り

Uotani M, Taniyama T, Yamazaki Y

JOURNAL OF APPLIED PHYSICS 87 巻 ( 9 ) 頁： 5585-5587 2000年5月

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