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

Author

Consolo, G. ; Lopez-Diaz, L. ; Torres, L. ; Azzerboni, B.

Author_Institution

Dipt. di Fisica della Materia e Tecnologie Fisiche Avanzate, Messina Univ.

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2974

Lastpage

2976

Abstract

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

Keywords

finite difference time-domain analysis; micromagnetics; point contacts; spin waves; analytical Higdon-type operators; artificial boundaries; boundary conditions; finite-difference time-domain techniques; micromagnetic framework; nonconfined geometries; point-contact geometries; site-dependent damping functions; spin-wave absorption; wave reflection rate; waves absorption; Absorption; Boundary conditions; Computational geometry; Damping; Finite difference methods; Micromagnetics; Physics computing; Robustness; Testing; Time domain analysis; Absorbing boundary conditions; point-contact devices; wave absorption; wave propagation;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.893124

Filename

4202730