Direct visualization of dynamic magnetic coupling in a Co/Py double layer with picosecond and nanometer resolution

Thomas Feggeler, Ralf Meckenstock, Detlef Spoddig, Christian Schöppner, Benjamin Zingsem, Taddäus Schaffers, Santa Pile, Hendrik Ohldag, Heiko Wende, Michael Farle, Andreas Ney, Katharina Ollefs

Research output: Working paperScientific


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.
Original languageEnglish
Publication statusPublished - 2019
MoE publication typeD4 Published development or research report or study

Publication series
PublisherCornell University
ISSN (Print)2331-8422


  • Condensed Matter - Mesoscale and Nanoscale Physics


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