Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Brillouin light scattering from pumped uniform-precession and low-k magnons in Ni81Fe19



Ward L. Johnson, Sudook A. Kim, Stephen E. Russek, Pavel Kabos


A method is presented for performing Brillouin-light-scattering measurements on uniform-precession and low-wave-number (Iow-k) magnons excited by a microwave magnetic field in opaque magnetic specimens. The optical configuration is similar to that employed in conventional 180^0 backscattering measurements, except that the incident and specularly reflected beams pass through the collection lens along different parallel paths. Examples of spectra from Ni_81 Fe_19 are presented, which include the first observation of pumped low-$k$ magnons arising from microwave excitation in a metallic film.
Applied Physics Letters


Brillouin light scattering, magnons, Permalloy, thin films
Created March 4, 2005, Updated January 27, 2020