Boundary Conditions for Spin-Wave Absorption Based on Different Site-Dependent Damping Functions

• Published in: IEEE transactions on magnetics Vol. 43; no. 6; pp. 2974 - 2976
• Main Authors: Consolo, G., Lopez-Diaz, L., Torres, L., Azzerboni, B.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2007; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Absorbing boundary conditions; Absorption; Boundaries; Boundary conditions; Computation; Computational geometry; Cross-disciplinary physics: materials science; rheology; Damping; Exact sciences and technology; Finite difference method; Finite difference methods; Magnetism; Materials science; Mathematical analysis; Mathematical models; Micromagnetics; Other topics in materials science; Physics; Physics computing; point-contact devices; Robustness; Testing; Time domain analysis; wave absorption; wave propagation; Damping; Absorption; point-contact devices; wave propagation; wave absorption; Absorbing boundary conditions; Boundary conditions; Magnetic materials; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2007.893124

Finite-difference time-domain techniques applied to nonconfined geometries impose the numerical implementation of computational areas smaller than the physical ones, so that it is necessary to develop a method for the waves absorption at the artificial boundaries. Due to the impossibility to implement some sort of analytical Higdon-type operators within a micromagnetic framework for point-contact geometries, two different absorbing boundary conditions are proposed. They are based on different site-dependent damping functions, whose value rises either abruptly or smoothly close to the computational boundaries. In this paper, it is first tested their robustness and then pointed out their effectiveness in reducing the rate of wave reflection of about three orders of magnitude in some cases