2009/06/04 by M. van Kampen, L. Lagae, Liesbet Lagae +6
Chemistry · Physics and Astronomy · #Chemistry #Condensed matter physics #Field (mathematics) #Laser linewidth #Magnetic field #Magnetic properties of thin films #Magnetoresistance #Mechanics #Oscillation (cell signaling) #Perpendicular #Physics #Physics of Superconductivity and Magnetism #Plane (geometry) #Quantum and electron transport phenomena #Quantum mechanics #Vortex #cond-mat.mtrl-sci
paper · pdf · doi:10.1088/0022-3727/42/24/245001
6 pages, 7 figures
arxiv created 2009/06/04 · openalex publication_date 2009/11/25 · arxiv updated 2015/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present an experimental and theoretical study of the low-field dynamics of current-driven vortex oscillations in nanocontacts based on spin-valve multilayers. These oscillations appear as low-frequency (250–500 MHz) excitations in the electrical power spectrum which arise from variations in the giant magnetoresistance. We show that the vortex oscillations, once nucleated at large fields applied perpendicular to the film plane, persist at zero applied magnetic fields. Some training effects on the oscillation frequency and linewidth are also observed for small in-plane magnetic fields.