Phase-resolved imaging of edge-mode spin waves using scanning transmission x-ray microscopy

Abstract

We have imaged the excitation of small-amplitude spin-wave eigenmodes, localized within $\sim$ 100 nm of the vertices of nanoscale Ni${}_{81}$Fe${}_{19}$ ellipses, using time-resolved scanning transmission x-ray microscopy (STXM) at 2 GHz and resolution of 70 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.

References in corpus (6)

• Electronic control of the spin-wave damping in a magnetic insulator
• Direct observation and imaging of a spin-wave soliton with $p-$like symmetry
• X-Ray Detection of Transient Magnetic Moments Induced by a Spin Current in Cu
• Microwave soft x-ray microscopy for nanoscale magnetization dynamics in the 5-10 GHz frequency range
• A compact apparatus for studies of element and phase-resolved ferromagnetic resonance
• Optical detection of spin transport in non-magnetic metals

Cited by in corpus (2)

• Advances in coherent coupling between magnons and acoustic phonons
• X-ray imaging of spin currents and magnetisation dynamics at the nanoscale