% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@INPROCEEDINGS{Qdemat:1028694,
      author       = {Qdemat, Asmaa and Kentzinger, Emmanuel and Buitenhuis,
                      Johan and Pütter, Sabine and Hussein, Mai and
                      Bednarski-Meinke, Connie and Seidel, Nadine and Petracic,
                      Oleg and Rücker, Ulrich and Brückel, Thomas},
      title        = {{C}urvature-modulated structural and magnetic properties of
                      thin filmsdeposited onto highly ordered nanosphere arrays},
      reportid     = {FZJ-2024-04751},
      year         = {2024},
      abstract     = {The magnetic interaction among magnetic nanostructures has
                      garnered significant attention, leading to extensive
                      research on magneticnanocaps. This exciting research trend
                      has motivated us to explore the potential of these
                      structures. We successfully fabricated andcharacterized
                      isolated and interconnected magnetic nanocaps by depositing
                      magnetic thin films on highly ordered arrays of nanospheres.
                      Theuse of curved surfaces as substrates causes lateral
                      variations in film thickness, resulting in varying deposited
                      material properties. Multilayers ofCo/Pd with varying Co
                      thicknesses were deposited using Molecular Beam Epitaxy
                      (MBE) on a flat silicon (Si) substrate and on densely
                      packedtwo-dimensional arrays of silica nanospheres with
                      diameters of 50 nm and 200 nm, formed using an improved
                      drop-casting method [1]. Themagnetic and structural
                      properties of the nanostructures obtained were compared to
                      those of films deposited simultaneously on a bare
                      Sisubstrate (reference film). Both the studied film and the
                      reference film were grown polycrystalline, while their
                      roughness, as observed from X-rayreflectivity, differed
                      significantly. X-ray reflectivity revealed that the
                      reference films displayed well-defined Kiessig oscillations,
                      indicating lowroughness in the deposited films. In contrast,
                      the films on nanospheres conformed to the curvature of the
                      underlying nanospheres and exhibiteda systematic periodic
                      variation, resulting in the absence of Kiessig oscillations.
                      Magnetic measurements using SQUID confirmed the formationof
                      magnetic nanocaps as they exhibited distinct magnetic
                      properties, including a different anisotropy axis direction
                      and a drastically highcoercivity with increasing film
                      thickness, compared to the flat films prepared on a bare Si
                      substrate. Furthermore, Grazing Incidence Small AngleX-ray
                      Scattering (GISAXS) confirms the formation of a
                      well-aligned, uniform nanosphere distribution. Additionally,
                      the depth-resolved profile ofthe magnetization was studied
                      using Polarized Neutron Reflectivity (PNR). The overall
                      results, the magnetic and structural properties of the
                      thinfilms were correlated as a function of film thickness
                      and nanosphere radius.SEM and GISAXS of (left) densely
                      packed two-dimensional arrays of monodisperse spherical
                      silica particles and (right) self-assembled particle arrays
                      after magnetic film depositionReferences[1] A. Qdemat,
                      et.al., RSC Adv., 10 (2020) 18339-18347},
      month         = {Jun},
      date          = {2024-06-30},
      organization  = {22nd International Conference on
                       Magnetism, Bologna (Italien), 30 Jun
                       2024 - 5 Jul 2024},
      subtyp        = {Invited},
      cin          = {JCNS-2 / JARA-FIT / IBI-4 / JCNS-4 / JCNS-HBS},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)IBI-4-20200312 / I:(DE-Juel1)JCNS-4-20201012 /
                      I:(DE-Juel1)JCNS-HBS-20180709},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1028694},
}