Epitaxial growth and exchange coupling of spinel ferrimagnet Ni 0.3Zn0.7Fe2O4 on multiferroic BiFeO3

Wei Jui Lin, Xiaoding Qi, Gung Chern, Jung Chun Andrew Huang

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11 Citations (Scopus)

Abstract

Thin films of the zinc nickel ferrite, Zn0.7Ni 0.3Fe2O4 (ZNFO), were deposited by the RF magnetron sputtering on a number of substrates, including (001) oriented single crystals of LaAlO3 (LAO) and SrTiO3 (STO), polycrystalline Pt/Si, and epitaxial films of BiFeO3 (BFO) and LaNiO3 (LNO). Except for the films on Pt/Si, the ZNFO films grown on other substrates were epitaxial and their magnetic properties were affected by the heteroepitaxy induced strains. Typically, the coercivity (Hc) was increased with the strain, i.e. Hc varied from 31 Oe for the 150 nm thick polycrystalline films grown on Pt/Si, to 55 Oe and 155 Oe for the 20 nm thick epitaxial films grown on BFO and LAO, respectively. The saturation magnetization of the epitaxial films was reduced accordingly to about 470 emu/cm3 from 986 emu/cm3 in the polycrystalline films. The all-oxide architecture allowed field-annealing to perform at the temperature above the Neel temperature of BFO (∼ 370 °C), after which clear exchange bias was observed.

Original languageEnglish
Pages (from-to)8326-8329
Number of pages4
JournalThin Solid Films
Volume519
Issue number23
DOIs
Publication statusPublished - 2011 Sep 30

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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