Faculty Profiles - TANIYAMA Tomoyasu

Papers - TANIYAMA Tomoyasu

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FePt nanoparticle-assembly for magnetic recording media Reviewed

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 Vol. 2002 ( 27 ) page： 483-490 2003

Crossover of magnetotransport process toward spin-polarized tunneling in manganite thin films Reviewed International journal

T Taniyama, M Yamasaki, Y Yamazaki

APPLIED PHYSICS LETTERS Vol. 81 ( 24 ) page： 4562 - 4564 2002.12

Language：English Publishing type：Research paper (scientific journal) Publisher：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

J-GLOBAL

Surface magnetism of Pd-Fe fine particles Reviewed International journal

T Shinohara, M Shigemune, T Sato, T Taniyama

IEEE TRANSACTIONS ON MAGNETICS Vol. 38 ( 5 ) page： 2634 - 2636 2002.9

Language：English Publishing type：Research paper (scientific journal) Publisher：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 Reviewed International journal

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

IEEE Transactions on Magnetics Vol. 38 ( 5 I ) page： 2872 - 2874 2002.9

Language：English Publishing type：Research paper (international conference proceedings)

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 Reviewed

Kuroda CS, Taniyama T, Kitamoto Y, Yamazaki Y

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Vol. 241 ( 2-3 ) page： 201-206 2002.3

Strain-induced anisotropic low-field magnetoresistance of La-Sr-Mn-O thin films Reviewed

Choi KK, Taniyama T, Yamazaki Y

JOURNAL OF APPLIED PHYSICS Vol. 90 ( 12 ) page： 6145-6150 2001.12

Selective dry etching of manganite thin films for high sensitive magnetoresistive sensors Reviewed

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

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Vol. 235 ( 1-3 ) page： 223-226 2001.10

Improvement in magneto-optical properties of Bi-YIG particulate films by reduction in particle size Reviewed

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

IEEE TRANSACTIONS ON MAGNETICS Vol. 37 ( 4 ) page： 2432-2434 2001.7

Magnetotransport and Mossbauer study of Fe3O4/gamma Fe2O3 granular thin films Reviewed

Taniyama T, Kitamoto Y, Yamazaki Y

JOURNAL OF APPLIED PHYSICS Vol. 89 ( 11 ) page： 7693-7695 2001.6

Magnetoresistance of manganite thin films induced by reaction with substrate Reviewed

Hamaya K, Taniyama T, Yamazaki Y

JOURNAL OF APPLIED PHYSICS Vol. 89 ( 11 ) page： 6320-6323 2001.6

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

Shinohara T, Sato T, Taniyama T, Sakurai H

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Vol. 226 page： 1939-1941 2001.5

Magnetotransport and spin con-figurations in patterned ferromagnetic wires Reviewed

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

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Vol. 226 page： 1850-1852 2001.5

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

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

PHYSICA C Vol. 338 ( 1-2 ) page： 126-131 2000.8

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 Reviewed

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

PHYSICA C Vol. 338 ( 1-2 ) page： 132-136 2000.8

Magnetic and magneto-transport properties of gamma Fe2O3-grain-embedded Fe3O4 thin films Reviewed

Uotani M, Taniyama T, Yamazaki Y

JOURNAL OF APPLIED PHYSICS Vol. 87 ( 9 ) page： 5585-5587 2000.5

Control of domain structures and magnetotransport properties in patterned ferromagnetic wires Reviewed

Taniyama T, Nakatani I, Yakabe T, Yamazaki Y

APPLIED PHYSICS LETTERS Vol. 76 ( 5 ) page： 613-615 2000.1

Microstructure and low-field magnetoresistance of La-Sr-Mn-O thin films Reviewed

Choi KK, Taniyama T, Yamazaki Y

ELECTROCHEMICAL TECHNOLOGY APPLICATIONS IN ELECTRONICS III Vol. 99 ( 34 ) page： 229-234 2000

Magnetization process of zigzag shaped Co wires Reviewed

Taniyama T, Nakatani I, Sato T, Namikawa T, Yamazaki Y

IEEE TRANSACTIONS ON MAGNETICS Vol. 35 ( 5 ) page： 3478-3480 1999.9

Room-temperature and low-field magnetoresistance of La-Sr-Mn-O thin films Reviewed

Choi KK, Taniyama T, Yamazaki Y

IEEE TRANSACTIONS ON MAGNETICS Vol. 35 ( 5 ) page： 2844-2846 1999.9

Bias dependent intergrain tunneling in lanthanum manganite thin films Reviewed

Nakano K, Naoe M, Yamasaki M, Choi KK, Taniyama T, Yamazaki Y

IEEE TRANSACTIONS ON MAGNETICS Vol. 35 ( 5 ) page： 2859-2861 1999.9

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Papers - TANIYAMA Tomoyasu