Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 50, Issue 11, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2014.2322378
Keywords
Ferrite films; magnetic insulators; magnetic tunneling; spin electronics; spin filter tunneling
Funding
- Helmholtz Association [HGF-NG-811]
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We present a study of the structural and chemical properties of the magnetic insulator NiFe2O4 on conductive Nb-doped SrTiO3 (001) substrates. Special regard is given to the dependence of the thin film properties on the O-2: Ar ratio during pulsed laser deposition. Using stoichiometric NiFe2O4 target material and varying the O-2 partial pressure from 0% to 100%, we find a nonzero oxygen threshold for heteroepitaxial growth and a stoichiometric Fe:Ni cation distribution. Moreover, our study clearly demonstrates that NiFe2O4 thin films grow with high quality over a wide range of oxygen partial pressures. These optimized NiFe2O4/SrTiO3 heterostructures are envisioned as efficient spin filter tunnel contacts for room temperature application.
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