Spin-Wave Eigen-modes in a Normally Magnetized Nano-pillarReport as inadecuate

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1 KFU - Kazan Volga region Federal University 2 SPEC - UMR3680 - Service de physique de l-état condensé

Abstract : We report on a spectroscopic study of the spin-wave eigen-modes in a circular spin-valve nano-pillar, perpendicularly magnetized alongˆzalongˆ alongˆz. Spectroscopy is performed by Magnetic Resonance Force Microscopy MRFM. Distinct spectra are measured depending on whether the nano-pillar is excited by a uniform in-plane radio-frequency RF magnetic field or by an RF current flowing perpendicularly through the layers. These results are in agreement with micromagnetic simulations of the time decay response of the local magnetization to excitations with different azimuthal symmetries, ˆ x + i ˆ ye −iiφ. This demonstrates that the azimuthal-index is the discriminating parameter for the selection rules, as only = 0 modes are excited by the RF magnetic field, whereas only = +1 modes are excited by the RF current, owing to the orthoradial symmetry of the induced RF Oersted field.

Author: V Naletov - G. De Loubens - S Borlenghi - Olivier Klein -

Source: https://hal.archives-ouvertes.fr/


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