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First-principles study of CoFe 2 O 4 /SrTiO 3 Superlattice. Takao Tsumuraya, Haowei Peng, Jung-Hwan Song, A. J. Freeman Northwestern University Materials Research Science & Engineering Center DMR-0520513.

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First-principles study of CoFe2O4/SrTiO3 Superlattice

Takao Tsumuraya, Haowei Peng, Jung-Hwan Song, A. J. Freeman

Northwestern University Materials Research Science & Engineering Center

DMR-0520513

Spinel ferrites such as NiFe2O4, CoFe2O4, and MnFe2O4, are candidates for spin filters in tunneling magnetoresistance (TMR). Enhancing the TMR of magnetic tunneling junctions (MTJs) is important to improve the performance of magnetic random access memories (MRAM). A 120% enhancement of TMR in La2/3Sr1/3MnO3/SrTiO3/NiFe2O4 junctions has been achieved in recent experiments.

Northwestern researchers theoretically determined the magnetic and electronic properties at the interface of superlattices composed of spinel ferrite CoFe2O4 and paraelectric SrTiO3 using the highly precise all-electron full-potential linearized augmented plane wave method (FLAPW). These results are used to guide the development of further advanced TMR design.

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Co

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Sr