Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5491210 | Journal of Magnetism and Magnetic Materials | 2017 | 6 Pages |
Abstract
We have imaged the excitation of small-amplitude spin-wave eigenmodes, localized within â¼100Â nm of the vertices of nanoscale Ni81Fe19 ellipses, using time-resolved scanning transmission x-ray microscopy (STXM) at 2Â GHz and resolution of 70Â nm. Taking advantage of the buried-layer sensitivity of STXM, we find that the magnetization precession at the two vertices changes from predominantly in-phase to out-of-phase in samples with and without a conductive layer deposited over the ellipses. As a plausible interpretation for the reversal in phase, we propose that unexpectedly strong Oersted fields are generated in the discontinuous overlayer, although effects of edge roughness cannot be fully excluded. The results demonstrate the capabilities of STXM to image small-amplitude, GHz magnetization dynamics with the potential to map rf magnetic fields on the nanoscale.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
C. Cheng, W. Cao, W.E. Bailey,