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1,072 results on '"Ohta, N."'

13. UV-induced desorption-retrapping cycle of electrochemically adsorbed CO on Pt(111) surface

Author

Ohta, N., Yu, Q. -K., and Nakabayashi, S.

Subjects
Electrochemistry -- Observations, Platinum -- Chemical properties, Excited state chemistry -- Observations, Chemicals, plastics and rubber industries
Abstract

CO adsorbed layer of Pt(111) electrode undergoes reconstruction when exposed to UV-irradiation (266 nm) from a nanosecond or femtosecond laser. UV induce CO desorption and retrapping cycles, which passed through electronic excited states at the surface were sustained on the electrode surface.

Published
2001

30. $f(R, R_{\mu\nu}^2)$ at one loop

Author

Ohta, N., Percacci, R., and Pereira, A. D.

Subjects
High Energy Physics - Theory, General Relativity and Quantum Cosmology
Abstract

We compute the one-loop divergences in a theory of gravity with Lagrangian of the general form $f(R,R_{\mu\nu}R^{\mu\nu})$, on an Einstein background. We also establish that the one-loop effective action is invariant under a duality that consists of changing certain parameters in the relation between the metric and the quantum fluctuation field. Finally, we discuss the unimodular version of such a theory and establish its equivalence at one-loop order with the general case., Comment: 14 pages, v2:minor corrections, refs. added/modified

Published
2018

31. F (R, Rμν2) at one loop

Author

Ohta, N., Percacci, R., and Pereira, A. D.

Subjects
Physics and Astronomy (miscellaneous), Computer Science::Digital Libraries, Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
Abstract

We compute the one-loop divergences in a theory of gravity with a Lagrangian of the general form f(R,RμνRμν), on an Einstein background. We also establish that the one-loop effective action is invariant under a duality that consists of changing certain parameters in the relation between the metric and the quantum fluctuation field. Finally, we discuss the unimodular version of such a theory and establish its equivalence at one-loop order with the general case.

Published
2018

36. Excitation of coherent spin waves at ultrafast thermomagnetic writing

Author

Tsukamoto, A., Nakagawa, K., Itoh, A., Kimel, A., Tsvetkov, A., Awano, H., Ohta, N., Kirilyuk, A., and Rasing, Th.

Subjects
Electromagnetism -- Research, Magnetization -- Research, Business, Electronics, Electronics and electrical industries
Abstract

We present results of a time-resolved study of the ultrafast magnetic response of [Gd.sub.23.1] [Fe.sub.71.9] [Co.sub.5.0] magnetically amplified magnetooptical systems (MAMMOS) structures under conditions near actual read/write temperatures. An all-optical pump and probe method was used in which an intense (pump) light beam excited a medium due to ultrafast laser heating and a less intense (probe) beam monitored this photo-excited state through the magnetooptical Kerr effect. Our experiment clearly demonstrates that the photo-excitation effectively excites coherent spin waves in the magnetic material. Precession frequencies of several gigahertz and relaxation times in the nanosecond range were observed. Index Terms--Magnetization precession, MAMMOS, thermomagnetic writing.

Published
2004

43. A new method for measurement of coercive force in bubble garnets using microwave absorption.

Author

Hosoe, Y., Ikeda, T., Ohta, N., and Sugita, Y.

Subjects
FORCE & energy, MAGNETIC bubble devices, MICROWAVES
Abstract

Presents a study that described a method for the measurement of coercive force in magnetic bubble garnets using microwave absorption. Analysis of the derivative absorption signal as a function of bias field; Examination of the derivative absorption as a function of modulation field amplitude; Application of the method on several bubble garnets.

Published
1987
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