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Large cone angle magnetization precession of an individual nanomagnet with dc electrical detection

M. V. Costache, S. M. Watts, M. Sladkov, C. H. van der Wal, B. J. van Wees

cond-mat.mes-hallarXiv:cond-mat/0609190

Abstract

We demonstrate on-chip resonant driving of large cone-angle magnetization precession of an individual nanoscale permalloy element. Strong driving is realized by locating the element in close proximity to the shorted end of a coplanar strip waveguide, which generates a microwave magnetic field. We used a microwave frequency modulation method to accurately measure resonant changes of the dc anisotropic magnetoresistance. Precession cone angles up to 90 are determined with better than one degree of resolution. The resonance peak shape is well-described by the Landau-Lifshitz-Gilbert equation.

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