Evolution of Interface Magnetism in Fe/Alq3 Bilayer Structure; Thickness-Dependent Interface Resolved Studies Under X-Ray Standing Wave
arxiv(2024)
Abstract
In the present work, interfacial magnetism at metal organic interface is
probed using an isotope sensitive interface resolved nuclear resonance
scattering technique which is made depth selective under x-rays standing wave
conditions. Using GIWAXS and GINRS measurements, this study evidences the
presence of symmetry-based PMA which appears at a lower thickness of Fe having
distortion in cubic symmetry and disappears at a higher thickness of Fe as its
cubic symmetry retains. The non-zero value of quadrupole splitting evidences
the strain at the interfacial region which on increasing thickness of Fe
relaxes. The diffusion of Fe is traced using XRF and NRR, deep penetration of
Fe in Alq3 layer due to soft nature of the organic film is obtained. This
thickness-dependent study enables us to understand the magnetic behavior of
buried ferromagnetic metal in the vicinity of organic molecules.
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