Abstract
A microscopic theory is developed for the spin-wave excitations in ferromagnetic nanorings where the physical dimensions (inner and outer diameters and height) may be of the same order. Both the dipole-dipole and the exchange interactions are included in the Hamiltonian, together with single-ion anisotropy terms and an external magnetic field assumed to be applied either parallel or perpendicular to the ring axis. The equilibrium configurations of the systems are obtained by minimizing numerically the energy functional with respect to the spin orientations. The nanorings can be in bottleneck, twisted, bidomain, or vortex types of configuration. A Green’s function method is employed to calculate the dispersion spectra and other spin-wave properties. Applications to real systems, such as nickel nanorings, are made by choosing the parameters appropriately.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
