Stripe domain characterization in weak perpendicular magnetic anisotropy hybrid hetersotructures for spin wave transmission using Xray resonant magnetic scattering

We have shown that, by magnetostatic coupling a soft magnetic layer with in-plane anisotropy to a harder one with perpendicular magnetic anisotropy (PMA), the spin wave dispersion in the soft layer gets determined by the periodic structure of the stripes as in a one-dimensional crystal [1] and, more interestingly, its ferromagnetic resonance frequency can be reconfigurable by the magnetic history of the device [2]. These singular functionalities are based on the stray field transfer of the highly ordered and complex pattern of magnetic stripe domains from the PMA material into the soft one through the non-magnetic spacer layer. Although the magnetic dynamic effect has been thoroughly characterized by different techniques [1,2], the reason behind the hysteretic effect in the magnon dispersion remains uncertain. A proper understanding of its fundamentals can lead to the design of novel low energy consumption magnonic devices. This proposal aims to understand the magnetic mechanism that causes this interesting property by separately characterizing the stripe domain of the hard magnet and the imprinted one on the soft layer as a function of the applied field using reflected Xray magnetic resonant scattering.
[1] K. Szulc, et al. ACS Nano 2022 16 (9), 14168-14177. DOI:10.1021/acsnano.2c04256
[2] D. Markó et al, Appl. Phys. Lett. 115, 082401 (2019). https://doi.org/10.1063/1.5104341