Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Spin dynamics and mode structure in nanomagnet arrays: effects of size and thickness on linewidth and damping

Published

Author(s)

Justin M. Shaw, Thomas J. Silva, Michael L. Schneider, Robert D. McMichael

Abstract

We use frequency resolved magneto-optic Kerr effect to probe the spin-dynamics and mode structure in 50 to 200 nm diameter Ni80Fe20 nanomagnets ranging from 3 to 10 nm in thickness. We find that the intrinsic Gilbert damping parameter is largely unaffected by the nanopatterning process despite a large linewidth dependence on the size of the nanomagnets. In the larger nanomagnets, both end and center mode are observed. The linewidth of these two modes differ considerably, which is most likely the result of the sensitivity of the end mode to small variations and imperfection of the shape and edge material. We show that this effect can be exploited as a means to separately characterize the magnetic properties of the nanomagnets as well as the size and shape variations within the array.
Citation
Physical Review B
Volume
79
Issue
18

Keywords

nanodots, magnetodynamics, spin dynamics, nanostructures, ferromagnetic resonance, nanomagnets

Citation

Shaw, J. , Silva, T. , Schneider, M. and McMichael, R. (2009), Spin dynamics and mode structure in nanomagnet arrays: effects of size and thickness on linewidth and damping, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=33207 (Accessed February 4, 2023)
Created May 5, 2009, Updated February 19, 2017