English, Article edition: MAGNETOSTATIC MODES IN NANOMETER-SIZED FERROMAGNETIC AND ANTIFERROMAGNETIC TUBES T. K. DAS; M. G. COTTAM

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Physical Description
  • article
Language
  • English

Edition details

Title
  • MAGNETOSTATIC MODES IN NANOMETER-SIZED FERROMAGNETIC AND ANTIFERROMAGNETIC TUBES
Author
  • T. K. DAS
  • M. G. COTTAM
Physical Description
  • article
Notes
  • A theory is presented for the magnetostatic modes in ferromagnetic and antiferromagnetic nanotubes, which have a large length-to-radius aspect ratio and an external magnetic field parallel to the cylindrical axis. The surface and bulk magnetic excitations (or magnetostatic spin waves) are studied for cases where the dipoleâdipole interactions are dominant in the spin dynamics. This situation can be realized at sufficiently small wavevectors by inelastic light scattering or magnetic resonance techniques. A macroscopic continuum theory is developed, using the magnetostatic form of Maxwell's equations and the electromagnetic boundary conditions, and the characteristic equations (or dispersion relations) are deduced for the magnetostatic modes. Numerical calculations are presented for ferromagnetic and antiferromagnetic nanostructures, taking Ni80Fe20 and MnF2, respectively. The spatial variations of the mode amplitudes are also investigated.
  • , 75.30.Ds, 75.75.+a, 75.50.Cc, 75.50.Ee
  • RePEc:wsi:srlxxx:v:14:y:2007:i:03:p:471-480
Language
  • English
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