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Singh, Amit
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article
Bulk Single Crystal‐Like Structural and Magnetic Characteristics of Epitaxial Spinel Ferrite Thin Films with Elimination of Antiphase Boundaries
Abstract
<jats:p>Spinel ferrite NiFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> thin films have been grown on three isostructural substrates, MgAl<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>, MgGa<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>, and CoGa<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> using pulsed laser deposition. These substrates have lattice mismatches of 3.1%, 0.8%, and 0.2%, respectively, with NiFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>. As expected, the films grown on MgAl<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> substrate show the presence of the antiphase boundary defects. However, no antiphase boundaries (APBs) are observed for films grown on near‐lattice‐matched substrates MgGa<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> and CoGa<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>. This demonstrates that by using isostructural and lattice‐matched substrates, the formation of APBs can be avoided in NiFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> thin films. Consequently, static and dynamic magnetic properties comparable with the bulk can be realized. Initial results indicate similar improvements in film quality and magnetic properties due to the elimination of APBs in other members of the spinel ferrite family, such as Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> and CoFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>, which have similar crystallographic structure and lattice constants as NiFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>.</jats:p>