Damping and modal structure of patterned magnetic nanoarrays

Authors

K Rivkin, Texas A&M University, USA
Ivan Nevirkovets, University of WollongongFollow
O Chernyashevskyy, Northwestern University, USA
J B. Ketterson, Northwestern University, USA
Bimal K. Sarma, University of Wisconsin, USA
V Metlushko, University of Illinois Chicago, USA

RIS ID

31389

Publication Details

Rivkin, K, Nevirkovets, I, Chernyashevskyy, O, Ketterson, JB, Sarma, BK & Metlushko, V (2009), Damping and modal structure of patterned magnetic nanoarrays, Journal of Magnetism and Magnetic Materials, 321(19), pp. 3324-3329.

Abstract

A number of studies have shown that ferromagnetic resonance linewidths in magnetic thin films contain a significant contribution due to processes, such as inhomogeneous broadening and two-magnon scattering followed by decay to the phonon thermal bath. We present a classical theoretical approach that permits the calculation of such processes for arrays of arbitrarily shaped magnetic nanoparticles and, by comparison with experimental results, demonstrates that the linewidth broadening and damping are dominated by inhomogenities that strongly depend on the equilibrium state of magnetization and can be used to identify the latter.