H. Toyosaki

Role of charge carriers for ferromagnetism in cobalt-doped rutile TiO2 (2008)

Fukumura, T, Toyosaki, H, Ueno, K, Nakano, M, Kawasaki, M

Electric and magnetic properties of a high temperature ferromagnetic oxide semiconductor, cobalt-doped rutile TiO2, are summarized. The cobalt-doped rutile TiO2 epitaxial thin films with different...

Indication of intrinsic room-temperature ferromagnetism in Ti1-xCoxO2-d thin film: An x-ray magnetic circular dichroism study (2006)

Mamiya, K., Koide, T., Fujimori, A., Tokano, H., Manaka, H., Tanaka, A., ...

Soft x-ray magnetic circular dichroism (XMCD) measurements at the Co L2,3 edges of Co doped rutile TiO2 at room temperature have revealed clear multiplet features characteristic of ferromagnetic Co2+...

Signature of Carrier-Induced Ferromagnetism in Ti_{1-x}Co_{x}O_{2-delta}: Exchange Interaction Between High-Spin Co 2+ and the Ti 3d Conduction Band (2005)

Quilty, J. W., Shibata, A., Takubo, K., Mizokawa, T., Toyosaki, H., ...

X-ray photoemission spectroscopy measurements were performed on thin-film samples of rutile Ti_{1-x}Co_{x}O_{2-delta} to reveal the electronic structure. The Co 2p core level spectra indicate that...

A ferromagnetic oxide semiconductor as spin injection electrode in magnetic tunnel junction (2005)

Toyosaki, H., Fukumura, T., Ueno, K., Nakano, M., Kawasaki, M.

A magnetic tunnel junctions composed of room temperature ferromagnetic semiconductor rutile Ti1-xCoxO2-d and ferromagnetic metal Fe0.1Co0.9 separated by AlOx barrier showed positive tunneling...

Magnetic oxide semiconductors (2005)

Fukumura, T., Toyosaki, H., Yamada, Y.

Magnetic oxide semiconductors, oxide semiconductors doped with transition metal elements, are one of the candidates for a high Curie temperature ferromagnetic semiconductor that is important to...

Evolution of ferromagnetic circular dichroism coincident with magnetization and anomalous Hall effect in Co-doped rutile TiO2 (2005)

Toyosaki, H., Fukumura, T., Yamada, Y., Kawasaki, M.

Magnetic circular dichroism (MCD) of rutile Ti1-xCoxO2-d is systematically examined with various x and d to reveal a phase diagram for the appearance of ferromagnetism at higher carrier concentration...

Carrier induced ferromagnetism in room temperature ferromagnetic semiconductor rutile TiO2 doped with Co (2003)

Toyosaki, H., Fukumura, T., Yamada, Y., Nakajima, K., Chikyow, T., Hasegawa, T., ...

A ferromagnetic semiconductor, rutile (Ti,Co)O2, exhibits anomalous Hall effect at room temperature. Strong dependence of the anomalous Hall effect, as well as the magneto-optic response, on the...

Exploration of oxide-based diluted magnetic semiconductors toward transparent spintronics (2003)

Fukumura, T., Yamada, Y., Toyosaki, H., Hasegawa, T., Koinuma, H., Kawasaki, M.

A review is given for the recent progress of research in the field of oxide-based diluted magnetic semiconductor (DMS), which was triggered by combinatorial discovery of transparent ferromagnet. The...

ALGEBRAIC ANALYSIS OF BENT-FROM-LINEAR TRANSITION INTENSITIES: THE EMISSION SPECTRUM OF METHINOPHOSPHIDE (HCP) (2003)

Pérez-Bernal, F., Iachello, F., Vaccaro, P. H., Ishikawa, H., Toyosaki, H.

$^{a}$ H. Ishikawa, H. Toyosaki, N. Mikami, F. P\'{e}rez-Bernal, P. H. Vaccaro, and F. Iachello, Chem. Phys. Lett. 365, 57 (2002).