The magnetization of epitaxial nanometric CoFe<inf>2</inf>O<inf>4</inf> (001) layers

F. Rigato, J. Geshev, V. Skumryev, J. Fontcuberta

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Abstract

We have studied the magnetic anisotropy of nanometric CoFe 2O4 (CFO) thin films grown on (100) SrTiO3 (STO) substrates. It has been found that epitaxial substrate-induced compressive strain makes the normal-to-film axis harder than the in-plane directions. In agreement with some previous reports, the magnetization loops are found to display a characteristic shrinking at low fields. Detailed structural and microstructural analyses, together with a modeling of the magnetization loops, revealed that the microstructure of the films, namely, the coexistence of a continuous CFO and a distribution of pyramidal CFO huts emerging from the surface, are responsible for this peculiar feature. We argue that this behavior, which significantly impacts the magnetic properties, could be a general trend of spinel films grow on (001)STO substrates. © 2009 American Institute of Physics.
Original languageEnglish
Article number113924
JournalJournal of Applied Physics
Volume106
DOIs
Publication statusPublished - 28 Dec 2009

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