Fizika Nizkikh Temperatur: Volume 44, Number 7 (July 2018), p. 814-823    ( to contents , go back )

Localization of magnon modes in a curved magnetic nanowire

Yuri Gaididei1, Volodymyr P. Kravchuk1,2, Franz G. Mertens3, Oleksandr V. Pylypovskyi4, Avadh Saxena5, Denis D. Sheka4, and Oleksii M. Volkov6

1Bogolyubov Institute for Theoretical Physics, Kyiv 03143, Ukraine
E-mail: ybg@bitp.kiev.ua

2Leibniz-Institut für Festkörper- und Werkstoffforschung, IFW Dresden, Dresden D-01171, Germany
E-mail: v.kravchuk@ifw-dresden.de

3Physics Institute, University of Bayreuth, Bayreuth 95440, Germany
E-mail: franzgmertens@gmail.com

4Taras Shevchenko National University of Kyiv, Kyiv 01601, Ukraine
E-mail: engraver@knu.ua; sheka@knu.ua

5Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
E-mail: avadh@lanl.gov

6Helmholtz-Zentrum Dresden-Rossendorf e. V., Institute of Ion Beam Physics and Materials Research Dresden 01328, Germany
E-mail: o.volkov@hzdr.de

Received January 22, 2018

Abstract

Spin waves in magnetic nanowires can be bound by a local bending of the wire. The eigenfrequency of a truly local magnon mode is determined by the curvature: a general analytical expression is established for any infinitesimally weak localized curvature of the wire. The interaction of the local mode with spin waves, propagating through the bend, results in scattering features, which is well confirmed by spin-lattice simulations.

PACS: 75.78.–n Magnetization dynamics;
PACS: 75.75.–c Magnetic properties of nanostructures;
PACS: 75.30.Et Exchange and superexchange interactions;
PACS: 75.30.Ds Spin waves.

Key words: magnetic wire, curvature, local mode, spin wave

Published online: May 28, 2018

Download 739589 byte View Contents