Control of conductivity in Fe-rich cobalt-ferrite thin films with perpendicular magnetic anisotropy
نویسندگان
چکیده
We fabricated two types of cobalt-ferrite (001) thin films, insulative Fe-rich ${\mathrm{Co}}_{x}{\mathrm{Fe}}_{3\ensuremath{-}x}{\mathrm{O}}_{4+\ensuremath{\delta}}$ (I-CFO) and conductive ${\mathrm{Co}}_{y}{\mathrm{Fe}}_{3\ensuremath{-}y}{\mathrm{O}}_{4}$ (C-CFO), with perpendicular magnetic anisotropy (PMA) on MgO substrates. Although the stoichiometric cobalt ferrite is known as an insulating material, it found that conductivity ferrites can be controlled by changing source materials deposition conditions in pulsed laser technique. The I-CFO C-CFO films exhibit PMA through in-plane lattice distortion. investigated Fe-ion-specific valence states both M\"ossbauer spectroscopy x-ray circular dichroism difference corresponds to abundance ratio ${\mathrm{Fe}}^{2+}$ state at octahedral $B$-site $({O}_{\mathrm{h}})$ inverse spinel structure. Furthermore, first-principles calculations reproduce changes density Fermi level depending cation vacancies $B$-site, which explains between C-CFO.
منابع مشابه
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ژورنال
عنوان ژورنال: Physical Review Materials
سال: 2023
ISSN: ['2476-0455', '2475-9953']
DOI: https://doi.org/10.1103/physrevmaterials.7.054402