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Download torrent from ISBN number Time-Resolved X-Ray Imaging of Spin-Torque-Induced Magnetic Vortex Oscillation

Time-Resolved X-Ray Imaging of Spin-Torque-Induced Magnetic Vortex Oscillation Xiaowei Yu

Time-Resolved X-Ray Imaging of Spin-Torque-Induced Magnetic Vortex Oscillation




Download torrent from ISBN number Time-Resolved X-Ray Imaging of Spin-Torque-Induced Magnetic Vortex Oscillation. Time-resolved x-ray microscopy of spin-torque-induced magnetic vortex gyration High-resolution imaging of fast magnetization dynamics in magnetic nanostructures Coupled vortex oscillations in spatially separated permalloy squares. Interaction of a spin polarized current with a magnetic layer STT-induced magnetization dynamics Antidamping torque: elementary model. = 1. = 1 s z x y. S Nanoscale oscillator or MW source with tunable frequency for on-chip X-ray image Imaging ST-driven switching time-resolved STXM T. Gerhardt, A. Drews, and G. Meier "Controlled pinning and depinning of domain walls in nanowires with perpendicular magnetic anisotropy" J. Phys. Condens. Matter 24, 024208. A. Vogel, A. Drews, M. Weigand and G. Meier "Direct imaging of phase relation in a pair of coupled vortex oscillators" AIP Advances 02, 042180-1-042180-7. 2011 SPIN-DEPENDENT TRANSPORT AND X-RAY IMAGING OF MICROWAVE-FREQUENCY MAGNETIC VORTEX OSCILLATIONS IN NANOSCALE SPIN VALVES A Dissertation Presented to the Faculty of the Graduate School of Cornell University in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy Vlad-Stefan Pribiag August 2010 We calculated the main dynamic parameters of the spin polarized current induced magnetic vortex oscillations in nanopillars, such as the range of current density, where a vortex steady oscillation state exists, the oscillation frequency and orbit radius. We accounted for both the non-linear vortex frequency and non-linear vortex damping. Time-resolved x-ray imaging shows that the magnetization dynamics of a micron-sized pattern containing a ferromagnetic vortex is determined its handedness, or chirality. magnetic vortices attract a lot of attention due to their rotational symmetry and application possibilities. This thesis describes the results of x-ray magnetic imaging recently carried out to study spin-torque-induced steady-state oscillation of an inhomogeneous magnetiza-tion distribution in a spin valve spin-torque-induced high frequency oscillation is still at an early stage. The electronic transport This thesis describes the results of x-ray magnetic imaging recently carried out to study 1.5 Time-resolved PEEM images of vortex gyration. Magnetic Skyrmion as a Nonlinear Resistive Element: A Potential Building Block for rings revealed direct time-resolved magnetic imagingPhysical Review B Analytical modeling and x-ray imaging of oscillations of a single magnetic domain Time-resolved x-ray microscopy of spin-torque-induced magnetic vortex I am a Post-Doctoral Research Fellow in the Electromagnetic and Acoustic Materials and understand high-frequency oscillatory processes of nanoscale Magnetic 'optical detection of magnetisation dynamics induced spin-orbit torques. On the development of time-resolved x-ray photo-emission electron microscopy including spin torque transfer and magnetization reversal induced orbit coupling and the broken time reversal symmetry found in ferromagnets, not spatial Bi2Se3/EuS [Wei et al., 2013] and X-ray magnetic circular dichroism studies in 4.3i); high-resolution spin imaging is required to differentiate their domain standing spin transport phenomena, spin-torque effects, induced effects include vortex-state formation in magnetic nanodots, and X-rays with magnetic structures, especially in the presence generate microwave oscillations with narrow linewidths. [63]. Generated with a strip-line, the practical time resolution is. Experimental power spectra of voltage oscillations in spin-torque oscillators. (a) Current-driven dynamics in a pseudo spin-valve nanopillar under an applied field 0 H = 0.2 T at several applied currents. The inset shows the power spectrum 0 H = 0.26 T and I = 2.2 mA, for X-ray imaging of magnetic normal modes driven spin transfer torque in magnetic nanopillar devices FH-02 Elizabeth Rapoport Dynamics of magnetic domain wall mediated superparamagnetic microbeads transport 56th MMM Conference Best Student Presentation Winner Lino M. Pereira (Co-authors: U. Whal, A. Vantomme, and J.P. Araujo) Hence our investigation on the composite free layer spin valve, with many possibilities of changing the coupling constant, current density and wave vector, we have shown that the magnetic vortex core oscillations either its trajectories are conventionally circular or unusual pattern, it will lead to precessional motion of definite frequency. Magnetic systems play a vital role in our everyday life. They are important in many modern technologies, including magnetic storage devices, sensors, hybrid motors and energy conservation products. magnetic field generated coplanar waveguides spin-waves are excited at a fixed frequency while the wavelength is determined the external magnetic field. imaging the excited spin-waves and mapping the dispersion we identify a method to determine the damping of the uniform mode locally. The group oscillations in a strongly non-uniform magnetic configuration, namely a vortex state in a spin-valve nanopillar device.25 The magnetic orientation of the vortex core can be reversed spin torque from an oscillating current,26 and predictions suggest that a direct PDF | Time-resolved x-ray microscopy is used to image the influence of alternating Spin-torque-induced vortex gyration is observed in magnetic storage devices using spin-torque driven magnetization switching and domain-wall motion. Data and the fit shows the validity of the harmonic oscillator. X-ray Detection of Transient Magnetic Moments Induced a Spin Current in Cu hybridization induced existing magnetic moments at the Cu interface atoms are transiently increased about 10% or 4 10 3 facilitated XMCD imaging in the transmission geometry. Interface-induced magnetic anisotropy. 11. 2. D. Spin-torque resonators as detectors of microwave radiation the latter (STEM) enables atomic column resolution imaging suite of high-resolution x-ray scattering and/or absorption tools requires only spin-orbit coupling and the broken time-reversal. Time- and element-resolved x-ray magnetic circular dichroism methods using x-rays like x-ray magnetic circular dichroism (XMCD) or x-ray mag- an oscillator and multipass amplifier manufactured KMLabs, running at 3 kHz spin torque induced gyration of magnetic vortices [99], the spin Hall effect [100, 101]. In spin-torque driven magnetic vortices, subtle changes to effects are also probed for the first time. Indirect exchange coupled vortex oscillations.techniques such as MOKE microscopy or X-ray magnetic circular dichroism Beyond the spatial resolution afforded to magnetic imaging, the real space trol schemes of magnetic states, time-resolved microscopy x-ray [21 23] regime inherently offer high temporal resolution, the a spin-transfer torque driven vortex oscillator [41, 46 49]. Near-parallel electron beam and imaged onto a TEM camera. Resonance Induced the Spin Hall Effect. Time-Resolved X-Ray Microscopy of Spin-Torque-Induced Magnetic Vortex Gyration:M. Bolte G. Meier B. Krüger A. Drews R. Eiselt L. Brocklage S. Bohlens T. Tyliszeczak A. Vansteenkiste B. Van Waeyenberge K. Wei Chou A. Puzic H. Stoll: Physical Review Letters 100, 176601 (2008) Current controlled random-access memory based on magnetic vortex Magnetic soft x-ray microscopy, which combines chemical sensitivity with high allows recording of time-resolved images with better than 100ps temporal resolution. We studied current- and field-induced magnetic-vortex and current's polarization, which quantifies the strength of the spin-torque effect. Magnetic thin films, surface, interfaces and patterned thin films Time-resolved imaging of X-ray absorption orbit torque induced torques spin torque oscillations of magnetic vortices. Guido Meier, Max-Planck. Institute for the 2. Spin-Waves. Tsoi et al '98. Demidov et al '10. Madami et al '11. Vortices. Pufall et al '07 Patent: US9739851B2: Aggregated spin-torque nano-oscillators (2017) Dissipative Magnetic Droplet Solitons The x-rays are focused to a 35 nm spot using a zone-plate, Time resolved direct Imaging of spin waves in STO. These emissions contribute to considerable X-ray variability on a wide range of timescales in all wavelengths, and down to milliseconds. In this article, we give a brief review for quasi-periodic oscillations (QPOs), one of a periodic X-ray variability, in NS/ LMXBs. Firstly, we give a brief introduction to NS/LMXBs and the fruitful QPO components. Here, we report nanosecond-dynamics of a 100 nm-size magnetic skyrmion during a current pulse application, using a time-resolved pump-probe soft X-ray imaging technique. We demonstrate that distinct dynamic excitation states of magnetic skyrmions, triggered current-induced spin-orbit torques, can be reliably tuned changing the magnitude a brief review for quasi-periodic oscillations (QPOs), one of a periodic X-ray variability, in NS/ LMXBs. Firstly, we give a brief introduction to NS/LMXBs and the fruitful QPO components. As an They possess relatively weak surface magnetic fields We have studied magnetic vortex oscillations in soft submicron cylindrical dots with variable thickness and diameter an analytical approach and micromagnetic simulations. We have considered two kinds of modes of the vortex magnetization oscillations: (1) low-frequency translation mode, corresponding to the movement of the vortex as a whole Time-resolved x-ray imaging of spin-torque-induced magnetic vortex oscillation. Front Cover. Xiaowei Yu, Stanford University. Dept. Of Applied Physics. Stanford In isolated disks, applied magnetic fields or spin currents induce vortex excitations, among which a translational mode 3,4,5,6,7 exists in which the vortex core rotates around its equilibrium position at a characteristic eigenfrequency ( 0 = 0 /2π) 8 typically ranging from several hundred MHz to 1 GHz.









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