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@ARTICLE{KAUSHIK:639292,
      author       = {KAUSHIK, SONIA and Raj, Rakhul and Gupta, Pooja and
                      Chumakov, Andrei and Schwartzkopf, Matthias and Reddy, V.
                      Raghavendra and Kumar, Dileep},
      title        = {{G}rowth-induced magnetic anisotropy in {C}o/{C}$_{60}$
                      bilayers: {I}nsights from a two-grain {S}toner-{W}ohlfarth
                      model},
      journal      = {Physical review / B},
      volume       = {111},
      number       = {18},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      reportid     = {PUBDB-2025-04393},
      pages        = {184426},
      year         = {2025},
      abstract     = {Organic spintronics has gained significant interest within
                      the scientific community due to its potential applications
                      in spin-valve devices. However, the realization of an
                      efficient room-temperature organic spin-valve device remains
                      elusive, primarily due to the complex spin transport at
                      metal-organic interfaces. Hence, the study of these
                      metal-organic bilayer interfaces is essential for the
                      conception of such devices. This study investigates the
                      Co-C$_{60}$ interface and its impact on the magnetic
                      properties of the Co layer. We examine the structural and
                      magnetic properties of ultrathin cobalt (Co) films deposited
                      on a fullerene (C$_{60}$) layer to understand the origin of
                      magnetic anisotropy in metal-organic bilayer structures. The
                      penetration of ferromagnetic Co atoms into the C$_{60}$ film
                      is confirmed through x-ray reflectivity and
                      secondary-ion-mass spectroscopy. Additionally, grazing
                      incidence small-angle x-ray scattering and atomic force
                      microscopy provide ample insights into the morphological
                      properties of the Co/C$_{60}$ bilayers. Grazing incidence
                      x-ray diffraction and grazing incidence wide-angle x-ray
                      scattering confirm the texturing of Co in the bilayer at
                      higher cobalt thicknesses. Angular-dependent magneto-optic
                      Kerr effect hysteresis measurements, with varying Co layer
                      thicknesses, reveal information about growth-induced
                      uniaxial magnetic anisotropy. Unlike inorganic silicon
                      substrates, where Co texturing and magnetic anisotropy are
                      absent, magnetic anisotropy in Co films begins to develop at
                      a thickness of 25 Å on the C$_{60}$ layer and increases
                      with further cobalt deposition. This texturing induces a
                      dispersion in magnetic anisotropy, leading to an anomalous
                      increase in coercivity and remanence along the hard axis.
                      The anomalous behavior in coercivity and remanence variation
                      along the nominal hard axis is explained by the two-grain
                      Stoner-Wohlfarth model and is further corroborated by the
                      nonuniform spatial distribution of magnetic domains observed
                      through Kerr microscopy. Our simulations show that these
                      magnetic anomalies arise due to the formation of local
                      energy minima in the energy landscape near the nominal hard
                      axis.},
      cin          = {FS-PETRA-D / DOOR ; HAS-User},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-PETRA-D-20210408 /
                      I:(DE-H253)HAS-User-20120731},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      INDIA-DESY - INDIA-DESY Collaboration
                      $(2020_Join2-INDIA-DESY)$},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      $G:(DE-HGF)2020_Join2-INDIA-DESY$},
      experiment   = {EXP:(DE-H253)P-P03-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/PhysRevB.111.184426},
      url          = {https://bib-pubdb1.desy.de/record/639292},
}