Zobrazeno 1 - 10
of 693
pro vyhledávání: '"Munekata, H."'
We report the room-temperature electroluminescence (EL) with nearly pure circular polarization (CP) from GaAs-based spin-polarized light-emitting diodes (spin-LEDs). External magnetic fields are not used during device operation. There are two small s
Externí odkaz:
http://arxiv.org/abs/1606.06834
Autor:
Matsuda, T., Munekata, H.
Publikováno v:
Phys. Rev. B 93, 075202 (2016)
Aiming at studying the mechanism of photo-excited precession of magnetization in ferromagnetic (Ga,Mn)As, magneto-optical (MO) and differential reflectivity (DR) temporal profiles are studied at relatively long and ultra-short time scales for samples
Externí odkaz:
http://arxiv.org/abs/1510.01587
Photo-excited precession of magnetization in (Ga,Mn)As is investigated by measuring time-resolved magneto-optical response and transient differential reflectivity with pump-and-probe technique. In the time region less than 1 ps, rapidly oscillating a
Externí odkaz:
http://arxiv.org/abs/1409.2209
Dependence of photo-induced FMR (phi-FMR) on incident angle of excitation and probing laser beams has been studied in a [Co (dCo = 0.78 nm) / Pd (dPd = 0.81 nm) ]5 multi-layer film with the aim to find experimentally the limitation of inducement and
Externí odkaz:
http://arxiv.org/abs/1404.4138
Helicity-dependent photocurrent delta-I has been detected successfully under experimental configuration that a circularly polarized light beam is impinged with a right angle on a cleaved sidewall of the Fe/x-AlOx/GaAs-based n-i-p double-heterostructu
Externí odkaz:
http://arxiv.org/abs/1404.4135
Fabrication and optical characteristics of a spin light-emitting-diode (spin-LED) having dual spin-injection electrodes with anti-parallel magnetization configuration are reported. Alternating a current between the two electrodes using a PC-driven cu
Externí odkaz:
http://arxiv.org/abs/1402.1239
Autor:
Nishizawa, N., Munekata, H.
We report that an ultra-thin, post-oxidized aluminum epilayer grown on the AlGaAs surface works as a high-quality tunnel barrier for spin injection from a ferromagnetic metal to a semiconductor. One of the key points of the present oxidation method i
Externí odkaz:
http://arxiv.org/abs/1306.5847
We have performed a systematic magneto-optical Kerr spectroscopy study of GaMnAs with varying Mn densities as a function of temperature, magnetic field, and photon energy. Unlike previous studies, the magnetization easy axis was perpendicular to the
Externí odkaz:
http://arxiv.org/abs/0907.1546
Autor:
Hashimoto, Y., Munekata, H.
We report dynamic control of magnetization precession by light alone. A ferromagnetic (Ga,Mn)As epilayer was used for experiments. Amplitude of precession was modulated to a large extent by tuning the time interval between two successive optical pump
Externí odkaz:
http://arxiv.org/abs/0810.3728
Publikováno v:
Phys. Rev. B 77, 235308 (2008)
We have studied ultrafast photoinduced demagnetization in GaMnAs via two-color time-resolved magneto-optical Kerr spectroscopy. Below-bandgap midinfrared pump pulses strongly excite the valence band, while near-infrared probe pulses reveal sub-picose
Externí odkaz:
http://arxiv.org/abs/0804.0451