Abstract
High quality single-crystal fcc-Cox(MgyZn1-y)1-xO1-v epitaxial thin films with high Co concentration up to x = 0.5 have been fabricated by molecular beam epitaxy. Systematic magnetic property characterization and soft X-ray absorption spectroscopy analysis indicate that the coexistence of ferromagnetic regions, superparamagnetic clusters, and non-magnetic boundaries in the as-prepared Cox(MgyZn1-y)1-xO1-v films is a consequence of the intrinsic inhomogeneous distribution of oxygen vacancies. Furthermore, the relative strength of multiple phases could be modulated by controlling the oxygen partial pressure during sample preparation. Armed with both controllable magnetic properties and tunable band-gap, Cox(MgyZn1-y)1-xO1-v films may have promising applications in future spintronics.
Highlights
High quality single-crystal fcc-Cox(MgyZn1-y)1-xO1-v epitaxial thin films with high Co concentration up to x = 0.5 have been fabricated by molecular beam epitaxy
Systematic magnetic property characterization and soft X-ray absorption spectroscopy analysis indicate that the coexistence of ferromagnetic regions, superparamagnetic clusters, and non-magnetic boundaries in the as-prepared Cox(MgyZn1-y)1-xO1-v films is a consequence of the intrinsic inhomogeneous distribution of oxygen vacancies
Typical reflection high energy electron diffraction (RHEED) patterns of MgO buffer layer deposited on SrTiO3 (001) substrate were shown in Fig. 1(a), demonstrating the well flatness of the growth surface, which provides fine template for later epitaxial growth
Summary
The relative strength of multiple phases could be modulated by controlling the oxygen partial pressure during sample preparation Armed with both controllable magnetic properties and tunable band-gap, Cox(MgyZn1-y)1-xO1-v films may have promising applications in future spintronics. Band gap engineering could be expected in CoMgZnO by tuning the composition ratio of Mg/Zn. Above all, magnetic property modulation could be achieved by tuning the Co and oxygen vacancy concentration in the CoMgZnO films, which makes CoMgZnO a promising candidate for future optical and spintronics applications. The systematic magnetic property and X-ray absorption spectroscopy (XAS) measurements indicated that intrinsic inhomogeneous distribution of oxygen vacancies leads to the coexistence of ferromagnetic, superparamagnetic and non-magnetic phases in the as-prepared CoMgZnO epitaxial films.
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