@techreport{7b7da153848c46f5a06e75d2debdad6e,
title = "Direct visualization of dynamic magnetic coupling in a Co/Py double layer with picosecond and nanometer resolution",
abstract = "We present a combination of ferromagnetic resonance (FMR) with spatially and time-resolved X-ray absorption spectroscopy in a scanning transmission X-ray microscope (STXM). This allows the direct measurement of the high-frequency component of the precessing magnetization using the transverse X-ray detected FMR (XFMR). We analyze the element-specific, dynamic magnetic contrast of a model system consisting of a Permalloy (Py) disk with a Cobalt (Co) stripe on top. These STXM-FMR images are snapshots of the magnetization-precession in the linear excitation regime of FMR with around 35 nm spatial resolution and ps temporal resolution. Spin wave excitations of the Py disk, the Co stripe and the coupled system are directly visualized by the element-specific dynamic magnetic contrast (of Co and the Ni of permalloy). We show that the resonantly excited Permalloy magnetization drives a spin wave excitation in the Co stripe, which we directly image in phase and amplitude. This phase and amplitude resolved measurement of an angular momentum transfer at the interface is possible due to the separation of excitation by microwaves and detection by X-rays.",
keywords = "Condensed Matter - Mesoscale and Nanoscale Physics",
author = "Thomas Feggeler and Ralf Meckenstock and Detlef Spoddig and Christian Sch{\"o}ppner and Benjamin Zingsem and Tadd{\"a}us Schaffers and Santa Pile and Hendrik Ohldag and Heiko Wende and Michael Farle and Andreas Ney and Katharina Ollefs",
year = "2019",
language = "English",
series = "arXiv.org",
publisher = "arXiv.org",
type = "WorkingPaper",
institution = "arXiv.org",
}