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J. Fidler, T. Schrefl, W. Scholz, D. Süss, V. Tsiantos, R. Dittrich, M. Kirschner:
"Magnetostatic spin waves in nanoelements";
Physica B: Condensed Matter, 343 (2004), 200 - 205.

Magnetostatic spin waves in nanoelements

J. FidlerCorresponding Author Contact Information, E-mail The Corresponding Author, T. Schrefl, W. Scholz, D. Suess, V. D. Tsiantos, R. Dittrich and M. Kirschner

Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10/138, A-1040, Vienna, Austria

Available online 3 December 2003.


Abstract

The relaxation of magnetostatic spin waves in a square NiFe nano-element (100×100×20 nm3) has been simulated by micromagnetic finite element modeling after the excitation by a rotational field of small mu, Greek0H=0.2 T with various frequencies between 1 and 16 GHz. The micromagnetic simulations are based on the Landau-Lifshitz-Gilbert equation of motion with a Gilbert damping parameter small alpha, Greek=0.02. The relaxation after switching off the external field led to a damped oscillation of the magnetization, which is related to changes of the exchange and magnetostatic field energies of the system. Finally, depending on the frequency of the rotating field "C-" and "S-" domain configurations were observed after approximately 10 ns. The different inhomogeneous magnetostatic and exchange field strength values inside the square for the "C-" and "S-" state lead to different frequencies of the magnetostatic spin-wave modes, such as about 4.5 GHz for the C-state and 3 GHz for the S-state, respectively.

Author Keywords: Numerical micromagnetics; Precessional switching; Magnetostatic spin waves; Rotational fields

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04970321

doi:10.1016/j.physb.2003.08.094