Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.71: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Scattering of dipole dominated spin waves from 1D inhomogeneity in ferromagnetic film — •M. Kostylev1, A. Serga2, T. Schneider2, B. Leven2, B. Hillebrands2, and R.L. Stamps1 — 1Department of Physics, University of Western Australia, Nedlands WA 6907, Australia — 2Fachbereich Physik, TU Kaiserslautern, 67663 Kaiserslautern
The scattering of backward volume magnetostatic spin waves (BVMSW) from a region of highly inhomogeneous magnetic field in ferromagnetic film was studied. The inhomogeneity was created by applying a dc current flowing through a thin wire situated on the surface of the film. Depending on the current direction the Oersted field either enhanced or decreased locally the total static field, thus creating a field profile in a form of a barrier (B) or a well (W). The amplitude T and phase φ of the BVMSW transmitted through the inhomogeneity was measured as a function of the magnitude of the current I and the wavenumber of incident wave k. In W-regime T(I) was found to be a monotonically decreasing function, whereas in B-regime the transmission is a minimum at about 0.6 A and maximum at about 1 A. The phase φ decreases linearly with I in B-regime, whereas in W-regime it deviates from linear increase towards lower values. Theoretically it was shown that the maximum of transmission in B-regime is a transmission resonance. The transition from linear to nonlinear φ(I) in the W-regime is interpreted as a transition from scattering of spin waves from an inhomogeneity to tunnelling through a prohibited zone [1].
[1] S.O.Demokritov et al. PRL, v.93, 047201 (2004)