ferromagnetic metal, dilute magnetic semiconductors and semiconductor quantum dots in the spectra of spintronics

Title: ferromagnetic metal, dilute magnetic semiconductors and semiconductor quantum dots in the spectra of spintronics Author: Xiong Hui Degree-granting units: Fudan University Keywords: spin rectification effect;; microwave photovoltage;; single crystal iron film;; GaMnAs films;; magnetic semiconductor;; semiconductor quantum dots;; significant
Fluorescence micro- Abstract:
Magnetic materials in microwave photovoltage Magnetic lifter discovery makes it finally found a use of means of electron spin to generate electricity, while it
Related to the traditional static magnetic and spin dynamics of the relationship between the problem opens up new research directions. In this paper, we
First discuss the molecular beam epitaxy of single crystal Fe film samples by using microwave technology, optical voltage electrical methods to detect the ferromagnetic resonance
Possibilities. To describe the experimental results, we have extended to the spin rectification Moxing the presence of magnetic anisotropy of the case, fitting results show
With the known Fe films on the theory of ferromagnetic resonance line very well and which accurately reproduce the magnetic anisotropy, demonstrated
The technology and the expansion of broad applicability. Further, through the analysis we found that the magnetic moment precession of the phase information can be
Read out the voltage of the linear light, which makes the technology could be used to detect the magnetic phase-related dynamics, and thus the current
Spintronics device design and http://www.999magnet.com/products/131-magnetic-lifter applications are of great significance. Then we switch to the study of ferromagnetic semiconductor system
GaMnAs film. By microwave photovoltage technique in which we systematically measured the ferromagnetic resonance changes with temperature, in order to spin
Rectifier model extended to the case of magnetization perpendicular to film surface, we derive a different magnetic state photovoltage general formula, derived from results
Results and experimental data fit well. Pd exchange interaction in a dynamic theoretical framework, we discuss the experimental magnetic moment of g by
Son, Gilberto attenuation and non-uniform ferromagnetic resonance line broadening temperature dependence, which reflects the self-consistent body of GaMnAs
Department of the origin of the ferromagnetic phase of the Zener model of nature. Further, the experimental low-field range of light that show unusual voltage hysteresis
Behavior by Stoner-Wohlfarth model, we follow the static magnetic nucleation process described in this phenomenon be attributed to magnetic
Of the strength of the hysteresis behavior of the vector itself, and magneto-transport measurements of the hysteresis voltage-independent and light reveals the stark contrast between the magnetic
Moment of the importance of phase precession. Accordingly, we determine not only microwave ray-voltage technology to efficiently detect the spin excitation, but also for complex
Magnetostatics process for in-depth research.
The other hand, semiconductor quantum dots as the representative of a small quantum structure of the exact spin
The object of regulation provides a good environment. The use of microscopic fluorescence spectroscopy, semiconductor quantum dot system we have in the spin-dependent exciton
Energy state and done a study of the interaction. First, we reported that according to a single InAs / GaAs quantum dot exciton energy levels with changes in the magnetic field
InAs quantum dots obtained in the exciton g-factor with its energy dependence, and thus to explore the importance of quantum-dot process parameters. Then
Next we switch to the CdSe / ZnSe quantum dots system. Of Mn-doped samples, to the introduction of the sd exchange interaction induced giant
Zeeman effect without significantly sacrificing the efficiency of fluorescent quantum dots, we have designed a CdSe / (3 monolayers) ZnMnSe / ZnSe the
Sandwich structure, experiments show that its quantum efficiency is much higher than the CdSe / ZnMnSe structure. According to spectral characteristics, we propose a different
Reported before the photoexcited carrier relaxation channels. For non-doped sample, in order to study the coupling effect between points, we prepared the amount of
Sub-point elements (for the double quantum dot structure) samples, and through the ground state of exciton splitting confirms the importance of the quantum coupling effect. Through
Through analogy with the Bell entangled state, we use a single spin state model explain the experimental results. Experimental and calculated results are shown as the points between
From the reduction of the quantum coupling effect increases, the fluorescence peak and led to the overall redshift. Further, by detecting a single
CdSe / ZnSe quantum of the fine spectral structure, we studied a variety of small energy scales of spin-related interaction forms, including
Charged exciton states in the Coulomb interaction, electron - hole exchange interaction and exciton spin - nuclear spin hyperfine interaction between. Degree Year: 2009