Nanoimprint lithographic surface patterning of sol–gel fabricated nickel ferrite (NiFe2O4)


Textured nickel ferrite (NFO, NiFe2O4) thin films were deposited at room temperature by chemical solution deposition onto c-plane sapphire substrates. A nanoimprint lithography technique using a polydimethylsiloxane stamp was used to transfer a pattern from a master to the thin film, which was subsequently annealed to crystallize the NFO. Atomic force microscopy scans showed good periodicity and feature profile over a large area which was confirmed with cross-sectional transmission electron microscopy. X-ray diffraction revealed textured single-phase inverse spinel NFO. Magnetic measurements of patterned thin films showed a large reduction in coercivity due to demagnetization factors.

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The authors would like to thank Dr. Nazanin Bassiri-Gharb and Elisabeth Deeb for supplying the NFO solution and Dr. Jan Genzer and Dr. Kirill Efimenko for their help with the PDMS stamp. The authors acknowledge the use of the Analytical Instrumentation Facility (AIF) at North Carolina State University, which is supported by the State of North Carolina and the National Science Foundation. Authors would also like to thank Dr. Yi Liu for his help with FIB and TEM measurements.

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Correspondence to Goran Rasic.

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Rasic, G., Schwartz, J. Nanoimprint lithographic surface patterning of sol–gel fabricated nickel ferrite (NiFe2O4). MRS Communications 3, 207–211 (2013).

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