Structural and magnetic properties of CoFe2O4 thin films grown on isostructural lattice-matched substrates

Author:

Regmi Sudhir1ORCID,Li Zhong2ORCID,KC Shambhu1,Mahat Rabin1ORCID,Rastogi Ankur34ORCID,Datta Ranjan5ORCID,Gupta Arunava6ORCID

Affiliation:

1. Department of Physics & Astronomy, The University of Alabama, Tuscaloosa, Alabama 35487, USA

2. Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA

3. Center for Functional Materials, Vellore Institute of Technology, Vellore 632014, India

4. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

5. International Center for Materials Science, Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center for Advanced Scientific Research, Bangalore 560064, India

6. Department of Chemistry & Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487, USA

Abstract

Epitaxial thin films of cobalt ferrite (CoFe2O4) are grown on two isostructural substrates, (001)-oriented MgGa2O4 and ZnGa2O4, using pulsed laser deposition. The substrates have a lattice mismatch of 1.26% and 0.70% with bulk CoFe2O4 (CFO) crystal. We have systematically investigated the structural and magnetic properties of the epitaxial CFO films on these substrates. X-ray diffraction and transmission electron microscopy result analysis reveal that the films deposited on spinel ZnGa2O4 are essentially free of defects and are under a small compressive strain, while films on MgGa2O4 show partial strain relaxation along with defect formation. Room temperature magnetization data indicate that CFO grown on ZnGa2O4 substrates have a bulk-like saturation magnetization of 420 emu/cc and a uniaxial substrate-induced anisotropy value of [Formula: see text] [Formula: see text] erg/cm3 with an anisotropy field as low as 60 kOe.

Funder

Division of Electrical, Communications and Cyber Systems

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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