to be continued 2009

Consolidation of hydrogenation?disproportionation-desorption?recombination processed Nd-Fe-B magnets by spark plasma sintering
K. Suresh, T. Ohkubo, Y. K. Takahashi, K. Oh-ishi, R. Gopalan,K. Hono, T. Nishiuchi, N. Nozawa, and S. Hirosawa, J. Mag. Mag. Mater., submitted.

Spin polarization of Fe₄N thin films determined by point-contact Andreev reflection
A. Narahara, K. Ito, T. Suemasu, Y. K. Takahashi, A. Rajanikanth, and K. Hono, Appl. Phys. Lett. 94, 202502 (2009).

Suppression of magnon excitations in Co₂MnSi Heusler alloy by Nd doping
A. Rajanikanth, Y. K. Takanashi and K. Hono, J. Appl. Phys. 105, 063916 (2009).

Highly spin polarized Co₂MnGa_0.5Sn_0.5 Heusler compound
B. Varaprasad, A. Rajanikanth, Y. K. Takahashi and K. Hono, Acta Mater. 57, 2702-2709 (2009)..

FePt-C nanogranular films for perpendicular magnetic recording
A. Perumal, Y. K. Takahashi, and K. Hono, J. Appl. Phys. 105, 07B732 (2009).

FeTaC soft underlayer for double-layered perpendicular recording media
A. Perumal, Y. K. Takahashi, and K. Hono, J. Appl. Phys. 105, 07A304 (2009).

Interlayer exchange coupling in Co₂FeAl_0.5Si_0.5/Cr/Co₂FeAl_0.5Si_0.5 trilayers
T. Furubayashi, K. Kodama, H. S. Goripati, Y. K. Takahashi, K. Inomata, and K. Hono, J. Appl. Phys. 105, 07E905 (2009).

Spin polarization of Co-Fe alloys estimated by point contact Andreev reflection and tunneling magnetoresistance
S. V. Karthik, T. M. Nakatani, A. Rajanikanth, Y. K. Takahashi, and K. Hono, J. Appl. Phys. 105, 07C916 (2009).

Coercive field and energy barriers in partially disordered FePt nanoparticles
G. R. Aranda, O. Chubykalo-Fesenko, R. Yanes, J. Gonzalez, J. J. del Val. R. W. Chantrell, Y. K. Takahashi and K. Hono, J. Appl. Phys. 105, 07B514
(2009)

2008

The effect of iron addition on the spin polarization and magnetic properties in Co₂CrGa Heusler alloy
T. M. Nakatani, Z. Gercsi, A. Rajanikanth, Y. K. Takahashi and K. Hono, J. Phys. D: Applied Physics, 41 225002 (2008).

Current-perpendicular-to-plane giant magnetoresistance in spin-valve structures using epitaxial Co₂FeAl_0.5Si_0.5/Ag/Co₂FeAl_0.5Si_0.5 trilayers
T. Furubayashi, K. Kodama, H. Sukegawa, Y. K. Takahashi, K. Inomata, and K. Hono, Appl. Phys. Lett. 93, 122507 (2008).

L1₀ FePt-C nanogranular perpendicular anisotropy films with narrow size distribution
A. Perumal, Y. K. Takahashi, and K. Hono, Appl. Phys. Express, 1, 101301 (2008).

Exchange bias of spin valve structure containing a top-pinned Co₄₀Fe₄₀B₂₀/IrMn
C. Y. You, H. S. Goripati, T. Furubayashi, Y. K. Takahashi, K. Hono, Appl. Phys. Lett. 93, 012501 (2008).

Boron segregation in crystallized MgO/amorphous-Co₄₀Fe₄₀B₂₀ thin films
C. Y. You, T. Ohkubo, Y. K. Takahashi, and K. Hono, J. Appl. Phys. 104, 033517 (2008).

The enhancement of spin polarization of Co₂MnSn by Fe doping
A. Rajanikanth, Y.K. Takahashi and K. Hono, J. Appl. Phys. 103, 103904 (2008).
Copyright (2008) American Institute of Physics

Particulate structure of L1₀ ordered ultrathin FePt films for perpendicular recording
A. Perumal, Y. K. Takahashi, T. O. Seki, and K. Hono, Appl. Phys. Lett. 92, 132508 (2008).
Copyright (2008) American Institute of Physics

Microstructure and magnetic properties of FePt-SiO₂ granular films with Ag addition
T. O. Seki, Y. K. Takahashi, and K. Hono, J. Appl. Phys. 103, 023910 (2008).
Copyright (2008) American Institute of Physics

Microstructure of CoNiFeB electroless-deposited soft magnetic underlayer for perpendicular recording media
Y. K. Takahashi, K. Hono, M. Ishii, S. Itoh, K. Ohashi, J. Mag. Mag. Mater. 320, 490-495(2008)..

Effect of base pressure on the structure and magnetic properties of FePt thin films
A. Asthana, Y.K. Takahashi, Y. Matsui and K. Hono, J. Mag. Mag. Mater. 320, 250-256 (2008).

2007

Fabrication and characterization of Co-ferrite thin films for a ferromagnetic barrier in a spin-filtering device operating at room temperature
R. Goto, Y. K. Takahashi, N. Tezuka, K. Inomata, S. Sugimoto, K. Hono, IEEE Trans. Mag. 43, 2797-2799 (2007).

Structure, magnetic property and spin polarization of Co₂FeAl_xSi_1-x Heusler alloy
T. M. Nakatani, A. Rajanikanth, Z. Gercsi, Y. K. Takahashi, K. Inomata, and K. Hono, J. Appl. Phys. 102, 033916 (2007).
Copyright (2007) American Institute of Physics

Effect of Cr substitution for Fe on the spin polarization of Co₂Cr_xFe_1-xSi Heusler alloys
S. V. Karthik, A. Rajanikanth, T. M. Nakatani, Z. Gercsi, Y. K. Takahashi, T. Furubayashi, K. Inomata and K. Hono, J. Appl. Phys, 102, 043903 (2007).
Copyright (2007) American Institute of Physics

Structural and magnetic properties of Co-ferrite thin films fabricated by plasma oxidation (in Japanese)
R. Goto, Y. K. Takahashi, S. Nakamura, N. Tezuka, K. Inomata, S. Sugimoto, and K. Hono J. Mag. Soc. Jpn. 31, 351 - 355 (2007).

Transmission electron microscopy of Co₂(Cr_1-xFe_x)Al sputtered films and their magnetic tunneling junctions
Y.K. Takahashi, T. Ohkubo, K. Hono, S. Okamura, N. Tezuka and K. Inomata, J. Mag. Mag. Mater. 313, 378 - 382 (2007).

Microstructure and spin polarization of quaternary Co₂Cr_1-xV_xAl, Co₂V_1-xFe_xAl and Co₂Cr_1-xFe_xAl Heusler alloys
S. V. Karthik, A. Rajanikanth, Y. K. Takahashi, T. Okhubo, and K. Hono, Acta Mater. 55, 3867 - 3874 (2007).

High spin polarization in a two phase quaternary Heusler alloy Co₂MnAl_0.5Sn_0.5
A. Rajanikanth, D. Kande , Y.K. Takahashi and K Hono, J. Appl. Phys, 101, 09J508 (2007).
Copyright (2007) American Institute of Physics

2006

Spin polarization of Co₂MnGe and Co₂MnSi thin films with A2 and L2₁ structures
A. Rajanikanth, Y. K. Takahashi, and K. Hono, J. Appl. Phys. (2006), accepted.

Preparation of monodisperse and highly coercive L1₀-FePt nanoparticles dispersible in nonpolar organic solvents
S. Yamamoto, Y. Morimoto, Y. Tamada, Y. K. Takahashi, K. Hono, T. Ono, and M. Takano, Chemistry of Materials, (2006), accepted.

Transmission electron microscopy of Co₂(Cr_1-xFe_x)Al sputtered films and their magnetic tunneling junctions
Y. K. Takahashi, T. Ohkubo, K. Hono, S. Okamura, N. Tezuka, and K. Inomata, J. Mag. Mag. Mater. (2006), accepted.

Magnetization reversal of FePt hard/soft stacked nanocomposite particle assembly
Y. K. Takahashi, K. Hono, S. Okamoto, and O. Kitakami, J. Appl. Phys. 100, 074305 (2006) .
Copyright (2006) American Institute of Physics

Spin polarization of Co₂FeSi full-Heusler alloy and tunneling magnetoresistance of its metallic tunneling junctions
Z. Gercsi , A. Rajanikanth , Y. K. Takahashi, and K. Hono, M. Kikuchi, N. Tezuka, and K. Inomata, Appl. Phys. Lett. 89, 082512 (2006).

Microstructures and coercivities of SmCo_x and Sm(Co,Cu)₅ films prepared by magnetron sputtering
J. Zhang, Y. K. Takahashi, R. Gopalan, and K. Hono, J. Mag. Mag. Mater., (2006) in press.

Spin polarization of quaternary Co₂Cr_1-xFe_xAl Heusler alloys
S. V. Karthink, A. Rajanikanth, Y. K. Takahashi, T. Ohkubo, and K. Hono, Appl. Phys. Lett. 89, 052505 (2006).
Copyright (2006) American Institute of Physics

Particulate structure of FePt thin films enhanced by Au and Ag alloying
C. Y. You, Y. K. Takahashi, and K. Hono, J. Appl. Phys.100, 056105 (2006).
Copyright (2006) American Institute of Physics

Microstructure and magnetic properties of SmCo₅ thin films deposited on Cu and Pt underlayers
Y. K. Takahashi, T. Ohkubo and K. Hono, J. Appl. Phys. 100, 053913 (2006).
Copyright (2006) American Institute of Physics

Current-perpendicular-to-plane magnetoresistance in epitaxial Co₂MnSi/Cr/Co₂MnSi trilayers
K. Yakushiji, K. Saito, S. Mitani, and K. Takanashi, Y. K. Takahashi, and K. Hono, Appl. Phys. Lett. 88, 222504 (2006).
Copyright (2006) American Institute of Physics

TMR properties for magnetic tunnel junctions with a disordered Co₂(Cr_1-xFe_x)Al electrode (in Japanese)
S. Okamura, A. Miyazaki, N. Tezuka, S. Sugimoto, K. Inomata, Y. K. Takahashi, and K. Hono, J. Mag. Soc. Jpn. 30, 366 - 369 (2006).

Formation of octahedral FePt nanoparticles by alternate deposition of FePt and MgO
T. Shima, K. Takanashi, Y. K. Takahashi, and K. Hono, Appl. Phys. Lett. 88, 063117 (2006).
Copyright (2006) American Institute of Physics

Nucleation-type magnetization behavior in FePt (001) particulate films
T. Shima, K. Takanashi, Y. K. Takahashi, K. Hono, G. Q. Li, and S. Ishio, J. Appl. Phys. 99, 033516 (2006).
Copyright (2006) American Institute of Physics

Microstructure and magnetic properties of interfacially disordered FePt nanoparticles
Y. K. Takahashi, K. Hono, S. Okamoto, O. Kitakami, and Y. Shimada, Mater. Trans. 47, 38 - 42 (2006).

2005

Size effect on the ordering of L1(0) FePt nanoparticles
T. Miyazaki, O. Kitakami, S. Okamoto, Y. Shimada, Z. Akase, Y. Murakami, D. Shindo, Y. K. Takahashi, K. Hono, Phys. Rev. B72, 144419 (2005).

Self-alignment of Fe nanoparticles on a tunnel barrier
F. Ernult, S. Mitani, K. Takanashi, Y. K. Takahashi, K. Hono, Y. Takahashi, and E. Matsubara, Appl. Phys. Lett. 87, 033115 (2005).

Magnetic properties and microstructure of the granular films processed by annealing Fe-Pt based multilayers
T. O. Seki, Y. K. Takahashi, and K. Hono, IEEE Trans. Mag. 41, 3799-3801 (2005).

Control of the size for octahedral FePt nano-dots and their magnetic properties
H. Ito, T. Shima, K. Takanashi, Y. K. Takahashi, and K. Hono, IEEE Trans Mag, 41, 3373-3375 (2005).

On low temperature ordering of FePt films
Y. K. Takahashi and K. Hono, Scripta Mater. 53, 403 - 409 (2005).

Sm(Co,Cu)₅/Fe exchange spring multilayer films with high energy product
J. Zhang, Y. K. Takahashi, R. Gopalan, and K. Hono, Appl. Phys. Lett. 86, 122509 - 122601 (2005) .
Copyright (2005) American Institute of Physics

Magnetic properties and microstructures of Fe-Pt thin films sputter deposited under nitrogen gass flow
C. Y. You, Y. K. Takahashi, and K. Hono, J. Appl. Phys. 98, 013902 (2005).
Copyright (2005) American Institute of Physics

Nano-constricted structure for current-confined-path in CPP spin-valves with high MR
H. Fukuzawa, H. Yuasa, K. Koi, H. Iwasaki, Y. Tanaka, Y. K. Takahashi, and K. Hono, J. Appl. Phys. 97, 10C509 (2005).
Copyright (2005) American Institute of Physics

Ordering process and size effect of Fept magnetic thin films (in Japanese)
Y. K. Takahashi and K. Hono, J. Mag. Soc. Jpn, 29, 72 - 79 (2005).

2004

Assembly of FePt L1₀ nanoparticles grown on MgO (110) with self-organized groove structure
S. Okamoto, O. Kitakami, T. Miyazaki, Y. Shimada, Y. K. Takahashi, and K. Hono, J. Appl. Phys. 96, 5217-5221 (2004).

Huge coercivity exceeding 100 kOe in epitaxially grown FePt sputtered films
T. Shima, K. Takanashi, Y. K. Takahashi, K. Hono, Appl. Phys. Lett. 85, 2571 - 2573 (2004).

Influence of the buffer layers on magnetic properties of FePt (001) films sputter-deposited at reduced temperature
T. Seki, T. Shima, K. Takanashi, Y. Takahashi, and E. Matsubara, Y. K. Takahashi and K. Hono J. Appl. Phys. 96, 1127 - 1132 (2004).

Microstructure and magnetic properties of FePt and Fe/FePt polycrystalline films with high coercivity
Y. K. Takahashi, T. O. Seki, K. Hono, T. Shima, and K. Takanashi, J. Appl. Phys. 96, 475 (2004).
Copyright (2004) American Institute of Physics

Spin-dependent single-electron-tunneling effects in epitaxial Fe nanoparticles
F. Ernult, K. Yamane, S. Mitani, K. Yakushiji, K. Takanashi, Y. K. Takahashi, and K. Hono, Appl. Phys. Lett. 84, 3106 - 3108 (2004).

Interfacial disorder in the FePt particles capped with amorphous Al₂O₃
Y. K. Takahashi and K. Hono, Appl. Phys. Lett. 84, 383 - 385 (2004).
Copyright (2004) American Institute of Physics

Size dependence of ordering in FePt nanoparticles
Y. K. Takahashi, T. Koyama, M. Ohnuma, T. Ohkubo, and K. Hono, J. Appl. Phys. 95, 2690 - 2696 (2004).
Copyright (2004) American Institute of Physics

Fabrication of L1₀ ordered FePt thin films with a canted easy magnetization axis on MgO (110) substrate
T. Shima, T. Sekia, K. Takanashia, Y. K. Takahashi, and K. Hono, J. Mag. Mag. Mater. submitted.

2003

Microstructure and magnetic properties of FePt thin films epitaxially grown on MgO (001) substrate
Y. K. Takahashi, K. Hono, T. Shima, and K. Takanashi, J. Mag. Mag. Mater. 267, 248-255 (2003).

High coercivity and magnetic domain observation in epitaxially grown particulate FePt thin films
T. Shima, K. Takanashia, Y. K. Takahashi, K. Hono, G. Q. Li, S. Ishio, J. Mag. Mag. Mater. 266, 171-177 (2003).

Ordering process of sputtered FePt films
Y. K. Takahashi, M. Ohnuma, and K. Hono, J. Appl. Phys. 93, 7580 - 7582 (2003).
Copyright (2003) American Institute of Physics

Size effect on the ordering of FePt granular films
Y. K. Takahashi, T. Ohkubo, M. Ohnuma and K. Hono, J. Appl. Phys. 93, 7166 - 7168 (2003).
Copyright (2003) American Institute of Physics

Size dependences of magnetic properties and switching behavior in FePt L10 nanoparticles
S. Okamoto, O. Kitakami, N. Kikuchi, T. Miyazaki, Y. Shimada and Y. K. Takahashi, Phys. Rev. B67, 094422 (2003).
Copyright (2003) American Institute of Physics

2002

Fabrication and characteristics of ordered Ni nanostructures on glass by anodization and direct current electrodeposition
S-Z. Chu, K. Wada, S. Inoue, S.todoroki, Y. K. Takahashi, and K. Hono, Chmistry of Materials,14, 4595 - 4602 (2002).

Realization of huge coercivity in highly ordered particulate FePt (001) films: morphology variation in the magnetization process
T. Shima, Y. K. Takahashi, K. Hono, and K. Takanashi, Appl. Phys. Lett. 81, 1050 - 1052 (2002).
Copyright (2001) American Institute of Physics

Effect of Cu on the structure and magnetic properties of FePt sputtered film
Y. K. Takahashi, M. Ohnuma, and K. Hono, J. Magn. Magn. Mater. 246, 259 - 265 (2002).

a'-FeCo-C スパッタ薄��E旅渋い伴Уて胆�
須永和晋,高橋有紀子,荘司弘��E高橋研,　��E椡�用磁気学会��Eaccepted , - , (2002).

New soft magnetic material of a'-Fe-C with high Bs
M. Takahashi, Y.K. Takahashi, K. Sunaga, H. Shoji, J. Magn. Magn. Mater. in press.

2001

Low-temperature fabrication of high-coercivity L1₀ ordered FePt magnetic thin films by sputtereing
Y.K. Takahashi, M. Ohnuma, K. Hono J. J. Appl. Phys. 40 (2001) L1367-L1369.

Effect of oxygen on the formation of Fe₁₆N₂ sputtered films
Y. Takahashi, M. Katou, H. Shoji, M. Takahashi, J. Magn. Magn. Mater. 232 (2001) 18-26.

Magnetocrystalline anisotropy for a'-Fe-C and a'-Fe-N films
M. Takahashi, Y. Takahashi, H. Shoji, IEEE Trans. Magn. 37, 2179 (2001).

2000

a'-(Fe_100-xNi_x)-N (x=5-30)薄��E旅渋い繁囲村Р�
高橋有紀子，荘司弘樹，高橋研, ��E椡�用磁気学会��E 24, 531 - 534, (2000).Impurity effect of carbon on structure and saturation magnetization of Fe-N films

Y. Takahashi, H. Shoji, M. Takahashi, J. Magn. Magn. Mater. 210, 333 - 340, (2000)

1999

コ��E瓠璽拭爾鰺僂い萄�椽したFe₁₆N₂スパッタ薄��E旅渋い繁囲村Р�
河愉薛紀子，荘司弘樹，高橋研, ��E椡�用磁気学会��E 23, 1185 - 1188, (1999)

清浄雰囲気で笹椽したa''-Fe₁₆N₂スパッタ薄��E旅渋い繁囲村Р�
荘司弘樹，加藤昌史，河愉薛紀子，高橋研，��E椡�用磁気学会��E�23, 1189 - 1192, (1999)

fct-Fe-Ni-N薄��E旅渋い繁囲村Р�
河愉薛紀子，荘司弘樹，高橋研，��E椡�用磁気学会��E�23, 1193 - 1196, (1999)

Previous Page