Spin Injection in LaAlO3/SrTiO3 Heterostructures

Adrian Swartz, Satoshi Harashima, Yanwu Xie, Di Lu, Bongju Kim, Chris Bell, Yasuyuki Hikita, Harold Y. Hwang

Research output: Contribution to journalArticle (Academic Journal)peer-review

30 Citations (Scopus)

Abstract

The conducting interface formed between LaAlO3 and SrTiO3 exhibits high electron mobility, tunable carrier densities, and is theoretically predicted to have long spin lifetimes. Thus, the LaAlO3/SrTiO3 heterostructure is a promising system for the transportation of spin information. We have investigated spin-dependent transport across Co/LaAlO3/SrTiO3 heterostructures using an all electrical three terminal geometry and observed Lorentzian magnetoresistance typically associated with Hanle spin dephasing. However, such a picture fails to explain all the experimentally observed behavior. Further, experiments with spin-unpolarized Au/LaAlO3/SrTiO3 heterojunctions support an alternative scenario involving current modulation by spin-dependent transport through defect states in the LaAlO3 barrier.
Original languageEnglish
Article number032406
Number of pages4
JournalApplied Physics Letters
Volume105
Issue number3
Early online date23 Jul 2014
DOIs
Publication statusPublished - Jul 2014

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