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Journal Articles

X-ray absorption spectroscopy and magnetic circular dichroism in codeposited C $_{60}$ -Co films with giant tunnel magnetoresistance

Matsumoto, Yoshihiro; Sakai, Seiji; Takagi, Yasumasa*; Nakagawa, Takeshi*; Yokoyama, Toshihiko*; Shimada, Toshihiro*; Mitani, Seiji*; Naramoto, Hiroshi*; Maeda, Yoshihito

Chemical Physics Letters, 470(4-6), p.244 - 248, 2009/03

https://doi.org/10.1016/j.cplett.2009.01.032

Times Cited Count：17 Percentile：51.15(Chemistry, Physical)

Electronic and spin states of the codeposited C $_{60}$ -Co films with large tunnel magnetoresistance (TMR) effect were investigated with the X-ray absorption and magnetic circular dichroism (MCD) spectroscopies. It is revealed that a C $_{60}$ -Co compound generated in the C $_{60}$ -Co films shows the clear MCD signal attributed to the spin-polarized Co 3d states hybridized with C $_{60}$ orbitals. The magnetic response of these Co 3d-derived states agrees well with temperature dependence of the observed MR ratios of the granular C $_{60}$ -Co films. This suggests the incorporation of the spin-polarized Co 3d-derived states of the C $_{60}$ -Co compound into the observed TMR effect.

Journal Articles

The Electronic structures of fullerene/transition-metal hybrid material

Matsumoto, Yoshihiro; Sakai, Seiji; Naramoto, Hiroshi*; Hirao, Norie*; Baba, Yuji; Shimada, Toshihiro*; Sugai, Isamu; Takanashi, Koki; Maeda, Yoshihito

Materials Research Society Symposium Proceedings, Vol.1081 (Internet), 6 Pages, 2008/03

Recently, we have found the appearance of substantial MR ratio (80%) in a C $_{60}$ /Co hybrid material. Such the MR ratio cannot be explained enough only by tunnel conduction through Co grains. Therefore, to obtain information about electronic structures of C $_{60}$ /Co hybrid material is necessary. Absorption spectra of C $_{60}$ Co are different from that of pristine C $_{60}$ . In particular, peak intensity corresponding to (LUMO) C 1s excitation of C $_{60}$ Co is clearly attenuated. In addition, C 1s photoelectron peak of C $_{60}$ Co slightly shifted to lower binding energy compared to that of pristine C $_{60}$ . These results indicate that 3d electron of Co transfers to orbital of C $_{60}$ and new electronic states are formed in the C $_{60}$ -Co compound. In fact, XPS spectra of valence excitation region also demonstrate the formation of hybrid orbital near the Fermi level due to the coupling of C $_{60}$ and Co.

JAEA Reports

Groundwater Sampling in HDB-4

Maeda, Toshihiro*; Horita, Masakuni*; *; Muroi, Tatsumi*

JNC TJ5410 2004-008, 202 Pages, 2004/03

JNC-TJ5410-2004-008.pdf:57.98MB

This work contains the following task to achieve the above-mentioned purpose; 1) measurement of pressure distribution before groundwater sampling. 2) continuous groundwater sampling from 3 different depths(227 to 231m, 285 to 289m, 477 to 479m). 3) groundwater sampling in confined pressure condition from the 3 different depths. 4) measurement of pressure distribution after groundwater sampling.

JAEA Reports

Installation of Multiple Piezometric Logger Systems for HDB-3 and HDB-4

Maeda, Toshihiro*; Horita, Masakuni*; Muroi, Tatsumi*

JNC TJ5410 2004-006, 119 Pages, 2003/12

JNC-TJ5410-2004-006.pdf:75.4MB

This contract is involved in installation of the multiple piezometric logger system (MP system) in order to make long-term measurement of groundwater pressure distribution and groundwater chemistry in boreholes.After installation of the measurement system, the function of the system was tested by measuring the pressure along the borehole and taking a water sample.

Journal Articles

The Brilliant result in JOYO - from JOYO to MONJU -

Mitsugi, Takeshi; Odo, Toshihiro; Abe, Tomoyuki; Isozaki, Kazunori; Maeda, Koji; Ito, Chikara

Genshiryoku eye, 49(9), 1 Pages, 2003/08

Focusing on the cover layer materials (as the Radon Barrier Materials), which could have the effect to restrain the radon from scattering into the air and the effect of the radiation shielding, we produced the radon barrier materials with crude bentonite on an experimental basis, using the rotary type comprehensive unit for grinding and mixing, through which we carried out the evaluation of the characteristics thereof.

Journal Articles

Glorious achievement of a quarter century operation and a promising project named MK-III in JOYO

Maeda, Yukimoto; Aoyama, Takafumi; Odo, Toshihiro; Nakai, Satoru;

P96, 96 Pages, 2002/00

None

JAEA Reports

Reduction technique of welding defect in the welded joint of aluminum alloys base on GTAW

Maeda, Akio; Oba, Toshihiro; Kikuchi, Hiroyuki; Shibata, Katsuyuki

JAERI-Tech 2001-003, 48 Pages, 2001/02

JAERI-Tech-2001-003.pdf:5.95MB

no abstracts in English

Journal Articles

Investigation of causality in the H-L transition on the JFT-2M tokamak

*; *; *; *; *; *; *; Oikawa, Toshihiro; *; *; et al.

Fusion Energy 1996, p.885 - 890, 1997/05

no abstracts in English

Oral presentation

Analysis of magnetic properties in C60-Co nanogranular thin film by XMCD spectroscopy

Matsumoto, Yoshihiro; Sakai, Seiji; Naramoto, Hiroshi*; Takagi, Yasumasa*; Nakagawa, Takeshi*; Shimada, Toshihiro*; Yokoyama, Toshihiko*; Maeda, Yoshihito

no journal, ,

no abstracts in English

Oral presentation

Giant TMR effect and spin states of C $_{60}$ -Co thin films

Sakai, Seiji; Matsumoto, Yoshihiro; Sugai, Isamu*; Mitani, Seiji*; Takanashi, Koki; Takagi, Yasumasa*; Nakagawa, Takeshi*; Yokoyama, Toshihiko*; Shimada, Toshihiro*; Maeda, Yoshihito

no journal, ,

no abstracts in English

Oral presentation

Electronic and spin states and giant tunnel magnetoresistance effect in C $_{60}$ -Co hybrid films

Sakai, Seiji; Matsumoto, Yoshihiro; Sugai, Isamu*; Mitani, Seiji*; Takanashi, Koki; Takagi, Yasumasa*; Nakagawa, Takeshi*; Yokoyama, Toshihiko*; Shimada, Toshihiro*; Naramoto, Hiroshi*; et al.

no journal, ,

no abstracts in English

Oral presentation

Soft X-ray circular dichroism study of electronic and magnetic states in C $_{60}$ -Co mixture film

Matsumoto, Yoshihiro; Sakai, Seiji; Naramoto, Hiroshi*; Nakagawa, Takeshi*; Takagi, Yasumasa*; Yokoyama, Toshihiko*; Takanashi, Koki; Mitani, Seiji*; Shimada, Toshihiro*; Maeda, Yoshihito

no journal, ,

no abstracts in English

Oral presentation

Electronic and magnetic states of codeposited C $_{60}$ -Co films with giant tunnel magnetoresistance effect

Matsumoto, Yoshihiro; Sakai, Seiji; Naramoto, Hiroshi*; Nakagawa, Takeshi*; Takagi, Yasumasa*; Yokoyama, Toshihiko*; Shimada, Toshihiro*; Mitani, Seiji*; Takanashi, Koki; Maeda, Yoshihito

no journal, ,

no abstracts in English

Oral presentation

X-ray magnetic circular dichroism of codeposited C60-Co films with giant tunnel magnetoresistance

Matsumoto, Yoshihiro; Sakai, Seiji; Naramoto, Hiroshi*; Nakagawa, Takeshi*; Takagi, Yasumasa*; Yokoyama, Toshihiko*; Hirao, Norie; Baba, Yuji; Shimada, Toshihiro*; Maeda, Yoshihito

no journal, ,

Recently, we have found that the codeposited C60-Co films where Co nanoparticles are dispersed into the matrix of the C60-Co compound show large tunnel magnetoresistanene (TMR) effects at low temperatures. The observed MR ratios cannot be explained by a spin-polarization of crystalline Co, so it is expected that the C60-Co compound mediates an enhancing effects to the spin-dependent transport in the films. In the present work, we have investigated the spin states of the C60-Co films by X-ray magnetic circular dichroism spectroscopy. As the results, MCD spectra of the C60-Co compound show the sensitivity to the sample temperature, which is consistent to the temperature dependence of MR ratios. This indicates clearly that spin-polarized states of the C60-Co compound influences the degree of spin-dependent transport in the films.

Oral presentation

Electronic and spin states of C $_{60}$ -Co thin films studied by XPS and X-ray magnetic circular dichroism

Matsumoto, Yoshihiro; Sakai, Seiji; Naramoto, Hiroshi*; Takagi, Yasumasa*; Nakagawa, Takeshi*; Yokoyama, Toshihiko*; Shimada, Toshihiro*; Hirao, Norie; Baba, Yuji; Maeda, Yoshihito

no journal, ,

Oral presentation

Electronic and spin states of C $_{60}$ -Co thin films studied by XPS and X-ray magnetic circular dichroism

Matsumoto, Yoshihiro; Sakai, Seiji; Takagi, Yasumasa*; Nakagawa, Takeshi*; Yokoyama, Toshihiko*; Mitani, Seiji*; Takanashi, Koki; Shimada, Toshihiro*; Naramoto, Hiroshi*; Maeda, Yoshihito

no journal, ,

no abstracts in English

Oral presentation

Giant TMR effect and spin states in fullerene-cobalt hybirid films

Sakai, Seiji; Matsumoto, Yoshihiro; Mitani, Seiji*; Takanashi, Koki; Takagi, Yasumasa*; Nakagawa, Takeshi*; Yokoyama, Toshihiko*; Shimada, Toshihiro*; Naramoto, Hiroshi*; Maeda, Yoshihito

no journal, ,

Anomalously large tunnel magnetoresistance (TMR) effects were found for the granular structured C60-Co films consisting of a C60-Co compound matrix and Co nanoparticles dispersed therein. The observed MR ratios of 90% at the maximum are significantly higher than the MR ratios of the inorganic granular films. Our recent X-ray magnetic circular dichroism study revealed that the C60-Co compound in the C60-Co films shows the paramagnetic behaviors due to the spin-polarized states (Co d-spin) derived from the Co 3d orbitals. We found that the T-dependence of the zero-bias MR ratio is represented by considering the similar T-dependence of the spin-polarization(P) of tunneling electrons to the observed T-dependence of the magnetization of the Co d-spin in the C60-Co compound, and by assuming P=100% at low temperature. This result suggests the incorporation of the spin-polarized Co 3d-derived states of the C60-Co compound into the spin-transport process in the granular C60-Co films.

Oral presentation

Spin states of the codeposited C $_{60}$ -Co thin films with giant tunnel magnetoresistance

Matsumoto, Yoshihiro; Sakai, Seiji; Naramoto, Hiroshi*; Nakagawa, Takeshi*; Takagi, Yasumasa*; Yokoyama, Toshihiko*; Shimada, Toshihiro*; Mitani, Seiji*; Takanashi, Koki; Maeda, Yoshihito

no journal, ,

no abstracts in English

Oral presentation

Electronic and spin states analysis of C $_{60}$ -Co compounds affecting giant tunneling magnetoresistance effect

Matsumoto, Yoshihiro; Sakai, Seiji; Entani, Shiro; Nakagawa, Takeshi*; Takagi, Yasumasa*; Yokoyama, Toshihiko*; Nagamatsu, Shinichi*; Shimada, Toshihiro*; Naramoto, Hiroshi*; Mitani, Seiji*; et al.

no journal, ,

no abstracts in English

Oral presentation

X-ray magnetic circular dichroism spectroscopy of codeposited C $_{60}$ -Co films

Matsumoto, Yoshihiro; Sakai, Seiji; Entani, Shiro; Nakagawa, Takeshi*; Takagi, Yasumasa*; Yokoyama, Toshihiko*; Nagamatsu, Shinichi*; Shimada, Toshihiro*; Naramoto, Hiroshi*; Mitani, Seiji*; et al.

no journal, ,

no abstracts in English