The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We are developing a sensitive magnetic tensor gradiometer for detection of underwater unexploded ordnance (UXO) using high temperature superconducting quantum interference devices (SQUIDs). In parallel with the instrument development, we are looking at the challenges of making electromagnetic field and gradient measurements in electrically conductive seawater. We have been carrying out a theoretical...
The magnetised plasma of near-Earth space (magnetosphere) supports two ultra-low frequency (ULF; 1-100 mHz), magnetohydrodynamic (MHD) oscillations known as the shear and fast Alfvén wave modes. The fast mode propagates across the ambient magnetic field, spreading ULF wave energy throughout the magnetosphere. For sufficiently large ionosphere conductance, the shear Alfvén mode forms field line resonances...
Controlled motion of 180° and 360° domain walls along planar nanowires is presented. Standard Landau - Lifshitz micromagnetic modeling has been used to simulate the response of the domain walls to the application of an external magnetic field. A 180° wall is quickly and easily moved with the application of an applied. field along the axis of the wire but a 360°domain wall is stationary in the same...
This paper presents a hybrid combination of the generalized ray expansion (GRE) method and high-frequency methods for analyzing the scattering and radiation problems incorporating electrically large and complex structures. A dense grid of ray tubes are launched from the phase centers of the subapertures making up the equivalent surface which encloses the target in the scattering problem, or the antenna...
We investigate the electronic structure of a superconductor in proximity of nanoscale ferromagnets (SC/FM hybrids) and find that a wide variety of superconducting order parameter landscape can be achieved by varying the parameters and the magnetic state of the nanomagnets. In particular, we propose an energy-angular momentum dispersion ε(l)) with the energy minimum at 1 ≠ 0 in systems with superconductivity...
This work simulates the shielding characteristic of a typical decay waveguide window for EMP. In the past, most researchers on electromagnetic protection have mainly focused their attention on the aperture coupling on the rectangular cavity. In contrast, the focus of this paper is not on it, but rather on the shielding characteristic of a typical decay waveguide window for EMP. The effect on EM coupling...
Based on recently developed near-field iterative physical optics (NFIPO) and the Poynting vector method, near-field angular glint calculation formulations are derived and applied to perfect electric conducting (PEC) radar targets, which are of great importance for radar seeker applications. Numerical results are presented with new findings to demonstrate the usefulness of the proposed technique.
This paper compares two different solutions to the problem of scattering by a perfectly conducting square plate illuminated by a normally incident plane wave. The first one is an accurate numerical solution intended to serve as benchmark, while the second is an accurate solution obtained from the truncation of an exact analytical solution.
Transient recordings of the electric and magnetic fields over the audio-band display significant transient pulses (spherics) which can be used for surface impedance measurements providing the lighting strike is distant and predominantly vertical. Horizontal lighting strikes, other atmospheric noise and instrument noise creates incorrect surface impedance data. Automated spheric selection can be made...
We investigate static magnetization as a function of a magnetic field during nucleation of the magnetic vortex state in Py dots with diameter of 1000 nm and with four different thicknesses varying between 15 and 50 nm. For the 50 nm thick Py dots we observe direct nucleation of the single vortex state from the saturated state, while the dots with thickness equal or below 25 nm reveal formation of...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.