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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...
A new magnetic quasi-particle called a chiral soliton is described in multilayered magnetic nanostructures. This quasi-particle exhibits many of the features exhibit by domain walls but is better suited to 3-dimensional device architectures.
Most of magnetic nano-structures today are ultrathin or nanostructured films and multilayers. The main challenge is to find a suitable technology to integrate and to contact nanostructures in a reliable manner. Here, we investigate the problem of contact integration into functional 3-D devices and evaluate the influence of 3-D magnetic layer geometry on performance of magneto-electronic devices. Real...
This paper presents a numerical method developed in order to compute the performances of antenna arrays taken into account coupling between radiating elements and edge effects. This method is based on domain decomposition techniques applied to boundary element solver.
A theorem is formulated and substantiated numerically, stating that if λm, n(v) is the n th zero of the generalized Laguerre polynomial Lm(v)(X) (x and λm, n(v) - real, positive, v =0,1,2,..., m =0,1,2,..., n =1,2,3...) and L(c, n) (c =1,2,3,...) is a positive real number, defined by means of the relation: L(c, n) =k_→-∞lim K_(c, n, k_) = k_→-∞lim M_(c, n, k_) in which K_(c, n, k_) = |k_|ζ(c)k_, n...
Presented is a study of uncompensated magnetization in antiferromagnets performed by SQUID and VSM magnetometry, and polarized neutron reflectometry. This uncompensated magnetization is observed and studied as a function of temperature and cooling conditions. Uncompensated magnetization is found close to the top surface of the antiferromagnet (interface with the ferromagnet) and also in the “bulk”...
Many time domain problems can be decomposed into several smaller sub-problems. Solutions of these sub-problem for several excitations can be aggregated to form the solution of the original problem. This general approach, known as diakoptics or domain decomposition, can be formulated along three routes, i.e., spatial and spectral domain decomposition, and the source decomposition method (SDM). The...
We report time-resolved x-ray photoemission electron microscopy studies of the non-linear magnetization dynamics in artificial permalloy structures. Using pump-probe X-PEEM imaging to obtain a time resolution of ~100ps, we map out the response of a vortex state to a strong in-plane bias field of 5mT. We find that the initial formation of the vortex state is characterized by a complex transient domain...
Motivated by functions that could be enabled with combined nanomechanical and nanomagnetic structures, we have embarked on a program of fabrication and characterization of nanomagnetomechanical systems. Fabrication strategies include conventional electron beam lithography with release from a sacrificial layer, and focused ion beam nanomachining of “2D” and “3D” precursor materials. Characterization...
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