Direct imaging of current induced magnetic vortex gyration in an asymmetric potential well

Bisig, Andre; Rhensius, Jan; Kammerer, Matthias; Curcic, Michael; Stoll, Hermann; Schütz, Gisela; Van Waeyenberge, Bartel; Kang Wei Chou; Tyliszczak, Tolek; Heyderman, Laura J.; Krzyk, Stephen; von Bieren, Arndt; Kläui, Mathias
April 2010
Applied Physics Letters;4/12/2010, Vol. 96 Issue 15, p152506
Academic Journal
Employing time-resolved x-ray microscopy, we investigate the dynamics of a pinned magnetic vortex domain wall in a magnetic nanowire. The gyrotropic motion of the vortex core is imaged in response to an exciting ac current. The elliptical vortex core trajectory at resonance reveals asymmetries in the local potential well that are correlated with the pinning geometry. Using the analytical model of a two-dimensional harmonic oscillator, we determine the resonance frequency of the vortex core gyration and, from the eccentricity of the vortex core trajectory at resonance, we can deduce the stiffness of the local potential well.


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