title: Anomalous enhancement in interfacial perpendicular magnetic anisotropy through uphill diffusion.
abstract: We observed interfacial chemical sharpening due to uphill diffusion in post annealed ultrathin multilayer stack of Co and Pt, which leads to enhanced interfacial perpendicular magnetic anisotropy (PMA). This is surprising as these elements are considered as perfectly miscible. This chemical sharpening was confirmed through quantitative energy dispersive x-ray (EDX) spectroscopy and intensity distribution of images taken on high angle annular dark field (HAADF) detector in Scanning Transmission Electron Microscopic (STEM) mode. This observation demonstrates an evidence of miscibility gap in ultrathin coherent Co/Pt multilayer stacks.
authors.affiliation: Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Colaba, Mumbai - 400 005, India.
authors.forename: Tanmay
authors.initials: T
authors.lastname: Das
authors.affiliation: Nanomaterials Research Lab, Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore-560 017, India.
authors.forename: Prabhanjan D
authors.initials: PD
authors.lastname: Kulkarni
authors.affiliation: Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Colaba, Mumbai - 400 005, India.
authors.forename: S C
authors.initials: SC
authors.lastname: Purandare
authors.affiliation: Nanomaterials Research Lab, Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore-560 017, India.
authors.forename: Harish C
authors.initials: HC
authors.lastname: Barshilia
authors.affiliation: Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Colaba, Mumbai - 400 005, India.
authors.forename: Somnath
authors.initials: S
authors.lastname: Bhattacharyya
authors.affiliation: Nanomaterials Research Lab, Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore-560 017, India.
authors.forename: Prasanta
authors.initials: P
authors.lastname: Chowdhury