guest ::
| Home > Online First > Nanoscale curvature enhances magnetization in CoPd alloy filmson nanospheres |
| Home > Online First > Nanoscale curvature enhances magnetization in CoPd alloy filmson nanospheres |
| Poster (Invited) | FZJ-2025-04107 |
; ; ; ; ; ; ; ; ; ; ;
2025
Abstract: We have investigated the influence of curvature on the magnetic properties of a Co-Pd alloy bydepositing Co-Pd alloy films, with different thicknesses, on monolayers of silicon dioxide (SiO₂)nanospheres, and on flat silicon substrates. The curved films exhibit enhanced magnetic scatteringlength density (mSLD), particularly for the thinner films, compared to the flat substrates. This isattributed to curvature induced strain and orbital hybridization, which boosts the local magneticmoment. However, as film thickness increases, the structural order of the nanosphere monolayersis disrupted, leading to rougher morphology and eventual coalescence into continuous films. SQUIDmagnetometry reveals that curvature alters magnetic anisotropy by weakening or tilting perpendicularmagnetic anisotropy (PMA) and increasing coercivity. Polarized neutron reflectometry (PNR)confirms stronger in-plane magnetization in curved films, and shows that thinner films exhibit ahigher magnetic scattering length density (mSLD) than thicker ones, due to enhanced interface effectsin the ultrathin regime. Despite high structural ordering, grazing-incidence small-angle neutronscattering (GISANS) detects no lateral magnetic coherence or domain-related scattering. Thisstudy highlights the significant role of curvature in tuning the magnetic properties of CoPd alloyfilms and underscores the combined power of PNR and GISANS in probing magnetism in such systems.
|