نتایج جستجو برای: magnetostatic interaction

تعداد نتایج: 566287  

Journal: :Physical review letters 2004
Riccardo Hertel Wulf Wulfhekel Jürgen Kirschner

We study the interaction between two important features of ferromagnetic nanoparticles: magnetic domain walls and spin waves. Micromagnetic simulations reveal that magnetostatic spin waves change their phase as they pass through domain walls. Similar to an Aharonov-Bohm experiment, we suggest to probe this effect by splitting the waves on different branches of a ring. The interference of mergin...

1999
Richard Dee Bo Cui Wei Wu Linshu Kong Xiaoyun Sun Stephen Y. Chou

Quantized magnetic disks consisting of an array of single domain Ni pillars with a density of 18 Gbits/in. were fabricated using nanoimprint lithography ~NIL! and electroplating. The total disk area, limited by the NIL mold, is 4 cm34 cm, leading to a total 45 Gbits. Magnetic force microscope ~MFM! images show that all pillars 70 nm in diameter and 400 nm in height are single domain. The magnet...

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2012
L O'Brien A Beguivin D Petit A Fernandez-Pacheco D Read R P Cowburn

The interaction of two domain walls (DWs) at a cross-shaped vertex fabricated from two ferromagnetic nanowires has been experimentally investigated. Both magnetostatically repulsive and attractive interactions have been probed. It is found that in the repulsive case, a passing DW may directly induce the depinning of another that is already pinned at a vertex. This effect can be qualitatively de...

2001
M. Rewieński

Abstract In this paper the magnetostatic energy in a ferromagnetic thin film with two imperfect, rough surfaces has been calculated. It has been shown that the surface roughness gives in some cases a considerable contribution to an effective perpendicular anisotropy. Within the model assumed it has been proved that the value of magnetostatic energy and, as a consequence, the anisotropy in a thi...

Journal: :iranian journal of science and technology (sciences) 2004
r. amrollahi

a simple new closed form of the green function for axisymmetric magnetostatic problemsis found analytically in cylindrical coordinates. the result is verified by applying several examples.

2002
Denis Horváth Martin Gmitra Ivo Vávra

Two dimensional square lattice general model of the magnetic dot array is introduced. In this model the intradot self-energy is predicted via the neural network and interdot magnetostatic coupling is approximated by the collection of several dipolar terms. The model has been applied to disk-shaped cluster involving 193 ultrathin dots and 772 interaction centers. In this case among the intradot ...

2004
Yuping Bao Michael Beerman Kannan M. Krishnan

We demonstrate the possibility of obtaining a rich set of self-assembled arrays from a single component cobalt nanocrystal (NC) system by a controlled variation of size, shape and inter-particle interactions. By selecting appropriate conditions in which one of a set of weak but competing interaction forces (steric, van der Waals, depletion, or magnetostatic) dominates we can reproducibly achiev...

Journal: :Monthly Notices of the Royal Astronomical Society 1966

Journal: :Physical review letters 2003
Igor Bargatin M L Roukes

We propose a magnetomechanical device that exhibits many properties of a laser. The device is formed by a nanocantilever and dynamically polarized paramagnetic nuclei of a solid sample in a strong external magnetic field. The corresponding quantum oscillator and effective two-level systems are coupled by the magnetostatic dipole-dipole interaction between a permanent magnet on the cantilever ti...

2001
K. G. Ong

Two wireless, passive remote query magnetism-based glucose sensors, which operate in combination with a mass and volume changing glucose responsive polymer, are presented. One sensor design is based upon the magnetostatic coupling of magnetically soft thin-film elements; as the polymer volume changes in response to glucose concentration so does the magnetostatic coupling between elements. In re...

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