Abstract
The influence of an electrical current on the propagation of magnetostatic surface waves is investigated in a relatively thick (40 nm) permalloy film both experimentally and theoretically. Contrary to previously studied thinner films where the dominating effect is the current-induced spin-wave Doppler shift, the magnetic field generated by the current (Oersted field) is found to induce a strong nonreciprocal frequency shift which overcompensates the Doppler shift. The measured current-induced frequency shift is in agreement with the developed theory. The theory relates the sign of the frequency shift to the spin-wave modal profiles. The good agreement between the experiment and the theory confirms a recent prediction of a counterintuitive mode localization for magnetostatic surface waves in the dipole-exchange regime. © 2014 American Physical Society.
| Original language | English |
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| Pages (from-to) | 094426-1 - 094426-12 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 89 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 31 Mar 2014 |