Zobrazeno 1 - 10
of 1 149
pro vyhledávání: '"Fukumura T"'
Publikováno v:
Jpn. J. Appl. Phys. 61, SB1031 (2022)
We determined the complex dielectric functions of $\varepsilon$-Ga$_2$O$_3$ using optical transmittance and reflectance spectroscopies at temperatures from 10 K to room temperature. The measured dielectric-function spectra reveal distinct structures
Externí odkaz:
http://arxiv.org/abs/2310.20276
Publikováno v:
Jpn. J. Appl. Phys, 63, 02SP09 (2024)
We have observed a new optical transition in the photoreflectance spectra of indirect-gap BiOCl thin films, which were grown on SrTiO$_3$ substrates. The position of this transition is close in energy to its bulk critical point energy. Moreover, thes
Externí odkaz:
http://arxiv.org/abs/2310.07199
Akademický článek
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Autor:
Makino, T., Liu, F., Yamasaki, T., Kozuka, Y., Ueno, K., Tsukazaki, A., Fukumura, T., Kong, Y., Kawasaki, M.
All-optical pump-probe detection of magnetization precession has been performed for ferromagnetic EuO thin films at 10 K. We demonstrate that the circularly-polarized light can be used to control the magnetization precession on an ultrafast time scal
Externí odkaz:
http://arxiv.org/abs/1207.6686
Autor:
Singh, V. R., Ishigami, K., Verma, V. K., Shibata, G., Yamazaki, Y., Kataoka, T., Fujimori, A., Chang, F. -H., Huang, D. -J., Lin, H. -J., Chen, C. T., Yamada, Y., Fukumura, T., Kawasaki, M.
Publikováno v:
Appl. Phys. Lett. 100, 242404 (2012)
We have studied magnetism in anatase Ti$_{1-x}$Co$_x$O$_{2-\delta}$ ({\it x} = 0.05) thin films with various electron carrier densities, by soft x-ray magnetic circular dichroism (XMCD) measurements at the Co $L_{2,3}$ absorption edges. For electrica
Externí odkaz:
http://arxiv.org/abs/1206.0339
Autor:
Liu, F., Makino, T., Yamazaki, T., Ueno, K., Tsukazaki, A., Fukumura, T., Kong, Y., Kawasaki, M.
We have investigated the ultrafast spin dynamics in EuO thin films by time-resolved Faraday rotation spectroscopy. The photoinduced magnetization is found to be increased in a transient manner, accompanied with subsequent demagnetization. The dynamic
Externí odkaz:
http://arxiv.org/abs/1205.2818
Autor:
Singh, V. R., Sakamoto, Y., Kataoka, T., Kobayashi, M., Yamazaki, Y., Fujimori, A., Chang, F. -H., Huang, D. -J., Lin, H. -J., Chen, C. T., Toyosaki, H., Fukumura, T., Kawasaki, M.
Publikováno v:
J. Phys. Condens. Mat. 23 (2011),176001--1-5
We have studied magnetism in Ti_[1-x]Co_xO_[2-\delta] thin films with various x and \delta by soft x-ray magnetic circular dichroism (XMCD) measurements at the Co L_[2,3] absorption edges. The estimated ferromagnetic moment by XMCD was 0.15-0.24 \mu\
Externí odkaz:
http://arxiv.org/abs/1103.6092
Publikováno v:
New J. Phys. 10, 055018 (2008)
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 electron densities and cobalt contents were grown on
Externí odkaz:
http://arxiv.org/abs/0805.3748
Autor:
Mamiya, K., Koide, T., Fujimori, A., Tokano, H., Manaka, H., Tanaka, A., Toyosaki, H., Fukumura, T., Kawasaki, M.
Publikováno v:
Appl. Phys. Lett. 89, 062506 (2006)
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+ ions coordinated by O2- ions, being in sharp contr
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603149
Autor:
Quilty, J. W., Shibata, A., Son, J. -Y., Takubo, K., Mizokawa, T., Toyosaki, H., Fukumura, T., Kawasaki, M.
Publikováno v:
Phys. Rev. Lett. 96, 027202 (2006)
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 the Co ions take the high-spin Co 2+ configuration, c
Externí odkaz:
http://arxiv.org/abs/cond-mat/0507193