2007/10/31 by Mark A. Hoefer, M. A. Hoefer, T. J. Silva +1
Engineering · Materials Science · Physics and Astronomy · #Characterization and Applications of Magnetic Nanoparticles #Condensed matter physics #Ferromagnetism #Field (mathematics) #Magnetic Properties and Applications #Magnetic field #Magnetic properties of thin films #Magnetization #Magnetization dynamics #Magnonics #Physics #Quantum mechanics #Semiclassical physics #Spin (aerodynamics) #Spin Hall effect #Spin polarization #Spin wave #Vortex #Wave packet #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.77.144401
published as Physical Review B, 77, 144401 (2008) · 19 pages, 8 figures; added content, figure, and more references
arxiv created 2007/12/22 · openalex publication_date 2008/04/01 · arxiv updated 2015/03/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A model of spin-torque-induced magnetization dynamics based on semiclassical spin diffusion theory for a single-layer nanocontact is presented. The model incorporates effects due to the current-induced Oersted field and predicts the generation of a variety of spatially dependent, coherent, precessional magnetic wave structures. Directionally controllable collimated spin-wave beams, vortex spiral waves, and localized standing waves are found to be excited by the interplay of the Oersted field and the orientation of an applied field. These fields act as a spin-wave ``corral'' around the nanocontact that controls the propagation of spin waves in certain directions.