- Kostyantyn Gusliyenko - Ikerbasque Basque Foundation for Science.
- Long-range spin wave mediated control of defect qubits in... - Nature.
- Dynamics of spiral spin waves in magnetic nanopatches.
- Influence of lattice defects on the ferromagnetic resonance behaviour.
- Dynamics of spiral spin waves in magnetic nanopatches:.
- FMR Measurements of Magnetic Nanostructures - IntechOpen.
- Structural and spin wave resonance studies of polycrystalline.
- Mohammad Haidar - Assistant Professor - American University... - LinkedIn.
- Influence of Permalloy Layer and Ti Spacer Thicknesses... - Scientific.Net.
- Spin-Wave Resonance Model of Surface... - Scientific Reports.
- Generation of spin currents by surface plasmon resonance.
- Spin wave filtering and guiding in Permalloy/iron nanowires.
- PDF THOMAS MCLENDON CRAWFORD - Professor of Physics tenured Physics and.
Kostyantyn Gusliyenko - Ikerbasque Basque Foundation for Science.
The microstructure and high frequency properties of facing-target sputtered epitaxial #x27;-Fe 4 N films were investigated in detail. It was found that the eddy current in ultrathin #x27;-Fe 4 N films is too small to influence the ferromagnetic resonance FMR linewidth, where the linewidth is mostly determined by intrinsic damping and the two-magnon scattering TMS process. Abstract Stripline SL, vector network analyzer VNA, and pulsed inductive microwave magnetometer PIMM techniques were used to measure the ferromagnetic resonance FMR linewidth for a series of Permalloy films with thicknesses of 50 and 100 nm. The SL-FMR measurements were made for fixed frequencies from 1.5 to 5.5 GHz.
Long-range spin wave mediated control of defect qubits in... - Nature.
Up-conversion of Spin Wave Modes in Y-shaped Permalloy Structures 03:10 PM Zbigniew Celinski UCCS Measurement of Sub-Zero Temperatures in Magnetic Resonance Imaging 03:30 PM - 05:30 PM Poster Session, LSC Theatre Balcony, Chair: Christopher Ard CSU 05:30 PM - 06:10 PM Afternoon Session 2, Chair: Hua Chen CSU. Nuclear Magnetic Resonance NMR technique is a convenient method to monitor magnetic nanoparticles in different biomedical applications and observe changes induced by the particles. To better understand the specifics of the magnetic resonance and spin relaxation in the systems with magnetic nanoparticles, the NMR spectra and magnetization dynamics of the.
Dynamics of spiral spin waves in magnetic nanopatches.
Abstract. We explore the dynamics of spiral spin waves in permalloy nanoelements with variable aspect ratio of geometric dimensions, and their potential use as improved spin wave emitters with no or little biasing field required. Numerical results show that above a certain thickness, propagating spiral waves can be obtained in circular and square. To analyze the frequency spectra of the excited system, we use the ringdown method [50], [51], which consists of two steps: i we obtain the minimum energy configuration at zero external field [52]; ii we perturb the system from its equilibrium state with a time-dependent field of the form h t = h 0 sinc 2 f max t t 0 y [53], where. The successful operation of spin-based data storage devices depends on thermally stable magnetic bits. At the same time, the data-processing speeds required by today#x27;s technology necessitate.
Influence of lattice defects on the ferromagnetic resonance behaviour.
The other mode has a higher resonance magnetic field of H R = 2100 Oe. For the antidot arrays of mean diameter of 70 nm Fig. 2c, the first resonance mode in the spectrum occurs at H R = 1550 Oe, well below the FMR field of the continuous Py film, and the other mode occurs at a higher magnetic field of H R = 3200 Oe. Download Download full.
Dynamics of spiral spin waves in magnetic nanopatches:.
Magnetic vortex structures are of high technological relevance due to their possible application in magnetic memory. Moreover, investigating magnetization reversal via vortex formation is an important topic in basic research. Typically, such vortices are only investigated in homogeneous magnetic materials of diverse shapes. Here, we report for the first time on micromagnetic simulation of. The influence of an electrical current on the propagation of magnetostatic surface waves is investigated in a relatively thick 40 nm permalloy film both experimentally and theoretically.... Contrary to previously studied thinner films where the dominating effect is the current-induced spin-wave Doppler shift, the magnetic field generated by. University of Colorado Colorado Springs Abstract We present experimental data on the power-dependent shift in the ferromagnetic resonance frequency of permalloy ribbons magnetized in plane. We find.
FMR Measurements of Magnetic Nanostructures - IntechOpen.
In the and potential application in the technology of solid state de- latter work, instead, there was evidence of marked discreti- vices and magnetic recording media.1 One important issue in zation of the spin-wave spectrum for saturated cylindrical these laterally confined magnetic structures is understanding Permalloy dots with radius R5100. Two sets of magnetic multilayers consisting of two 600 A permalloy Ni83Fe17 films separated by varying thicknesses of Cr, sandwiched between two fur.... The spin flip caused by the thermal effect or spin orbit interaction. A spin wave that conveys spin information can also be called a spin current without the flow of spin-polarized electrons. The advantage of the spin wave is its long-range propagation over a millimeter scale in yttrium iron garnet YIG, and over a 10 m scale in a permalloy.
Structural and spin wave resonance studies of polycrystalline.
We explore the dynamics of spiral spin waves in permalloy nanoelements with variable aspect ratio of geometric dimensions, and their potential use as improved spin wave emitters with no or little biasing field required. Numerical results show that above a certain thickness, propagating spiral waves can be obtained in circular and square shaped elements in a flux closure state. VNA-FMR.
Mohammad Haidar - Assistant Professor - American University... - LinkedIn.
We have investigated the stability for the resonant spin precession under the strong microwave magnetic field by a specially developed detection method using the anisotropic magnetoresistance effect. The electrically separated excitation and detection circuits enable us to investigate the influence of the heating effect and the nonuniform spin dynamics independently. The large detecting. Abstract and Figures We report ferromagnetic resonance FMR study on a grid formed with permalloy nanowires to understand the spin wave dynamics. The presence of two sets of magnetic nanowires.
Influence of Permalloy Layer and Ti Spacer Thicknesses... - Scientific.Net.
The magnetic properties and propagation of electromagnetic waves in magnetic nanoparticle systems strongly depend on the interactions between the nanosize elements having finite separation. Several aspects of the role of the dipolar and exchange interactions are reviewed on model periodic 2D and 3D magnetic nanostructures. Experiments and theory expose the critical role of proper calculation. Influence of magnetic relaxation on magnetoelastic resonance-based sensors - Beatriz Sisniega: 16:45 - 19:00... Gas sensors using magnetic nanoparticles and spin waves for breath analysis - Juan Diego Aguilera Martin:... Permalloy nanodome surfaces on PEEK/TiO2 vertical nanotubes composites - Ruy Sanz. We have studied both experimentally and theoretically the reprogrammable spin wave band structure in Permalloy10 nm/Cu5 nm/Permalloy30 nm nanowire arrays of width w = 280 nm and inter-wire.
Spin-Wave Resonance Model of Surface... - Scientific Reports.
Author s Rebecca L. Thomas, Meng Zhu, Cindi L. Dennis, Veena Misra, Robert McMichael. A spin-wave Doppler technique is used to measure the spin-transfer velocity and the current polarization in current-carrying Ni80Fe201-xGdx alloy wires. Reduced magnetization values with Gd doping suggest possible increases in the spin-transfer velocity. The calculations show that the resonances are realized at H=645 Oe for the modes with n=0 and n=84 resonance No 1; at H=740 Oe for the modes with n=2 and n=82 resonance No 2; at H=850 Oe for the modes with n=4 and n=78 resonance No 3 respectively. For these resonances m spin wave mode number is zero m=0. Abstract In this paper, we theoretically and experimentally investigate magnetization reversal and associated spin-wave dynamics of isolated threefold vertices that constitute a Kagome lattice. The three permalloy macrospins making up the vertex have an elliptical cross section and a uniform thickness.
Generation of spin currents by surface plasmon resonance.
Ground states of nanospheres. Figure 1a shows a nanosphere model of spherical symmetry. As described in Methods, we performed micromagnetic numerical calculations on Permalloy Py, Ni 80 Fe 20 nanoparticles of different diameters, 2R = 10 nm - 150 nm see Methods. Figure 1b illustrates the ground states of the spheres obtained through relaxation from their saturated states in the x direction. Finally, spin-waves SW modes excited in a submicron permalloy ellipse with a vortex pair configuration have been addressed by Zhang et al. [15]. Although the magnetic behavior of ellipses has been intensely investigated, stadium-shaped nanoparticles have received less attention. When a magnetic system is excited by a high-frequency EMW, the excited spin system responds with a spin-wave SW excitation spectrum, strongly depending on the shape and size of the particles. In nanosize particles of nonellipsoidal geometry, the SW spectra are peculiar, as it is described in Section 21.3.1.
Spin wave filtering and guiding in Permalloy/iron nanowires.
4.1.6. Nuclear Magnetic Resonance NMR Spectroscopy. NMR spectroscopy is an analytical method for the quantitative determination of magnetic nanoparticle structures. NMR spectroscopy is based on magnetic resonance of the nanoparticles#x27; nucleii under a strong magnetic field that induces an energy difference between the down and up spins. We have studied experimentally the radiation of spin waves from a permalloy-film microwaveguide into a continuous permalloy film. We show that due to a strong mismatch of the spin-wave spectrum caused by a variation in the demagnetizing field at the interface between the waveguide and the film, a frequency interval exists, where spin waves experience total reflection from the junction.
PDF THOMAS MCLENDON CRAWFORD - Professor of Physics tenured Physics and.
We investigated the microwave-assisted DC voltages of ferromagnetic resonances and exchangedominated standing spin wave excitations in two different in-plane magnetized permalloy thin films via homodyne detection. The line shapes of ferromagnetic resonance spectra and the dispersion curves of ferromagnetic resonance and standing spin wave are in agreement of previous studies, while further.
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