Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 45: Micromagnetism/ Computational Magnetics
MA 45.3: Vortrag
Mittwoch, 16. März 2011, 18:00–18:15, HSZ 403
Transmission of spin waves at pinned domain walls in exchange-spring composite media — •Sebastian Macke1 and Dagmar Goll2 — 1Max Planck Institute for Metals Research, Heisenbergstr. 3, 70569 Stuttgart — 2Aalen University, Materials Research Institute, Beethovenstr. 1, 73430 Aalen
Exchange-coupled composite (ECC) elements which seem to be most straightforward for realizing ultrahigh recording densities (>1 Tbit/in2) are composed of a hard magnetic part and a soft magnetic part which are coupled by exchange interaction through the common interface. Recently investigations of the spin wave behavior at hard-soft interfaces started to become a matter of interest in order to determine the magnetic properties at the interfaces. With a pinned magnetic domain wall at such interfaces these properties can be influenced by an external magnetic field [1] which can be used in spin wave valve applications. We investigated the injection of spin waves from one material into the other by analyzing the frequency dependent transmission and reflection coefficients of the propagating spin waves. The topic is handled within the framework of the continuum theory of micromagnetism by numerical simulations. Pinned by an external magnetic field at the interface charged Néel walls in stripes as well as Néel walls in thin films are analyzed for different material combinations. Dependent on the spin wave frequency the transmission rate of the spin waves can change by one order of magnitude when the strength of the applied magnetic field is close to the depinning field.
[1] Livesey et. al., Phys. Rev. B. 73, 184432 (2006)