Thickness dependence of exchange coupling in (111)-oriented perovskite oxide superlattices

Jia, Yue; Chopdekar, Rajesh V.; Arenholz, Elke; Liu, Zhiqi; Biegalski, Michael D.; Porter, Zachary D.; Mehta, Apurva; Takamura, Yayoi

doi:10.1103/PhysRevB.93.104403

Thickness dependence of exchange coupling in (111)-oriented perovskite oxide superlattices

Journal Article · Wed Mar 02 23:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.104403· OSTI ID:1329130

Jia, Yue ^[1]; Chopdekar, Rajesh V. ^[1]; Arenholz, Elke ^[2]; Liu, Zhiqi ^[3]; Biegalski, Michael D. ^[3]; Porter, Zachary D. ^[4]; Mehta, Apurva ^[4]; Takamura, Yayoi ^[1]

Univ. of California, Davis, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)

Epitaxial La_0.7Sr_0.3MnO₃ (LSMO)/La_0.7Sr_0.3FeO₃ (LSFO) superlattices on (111)-oriented SrTiO₃ substrates with sublayer thicknesses ranging from 3 to 60 unit cells (u.c.) were synthesized and characterized. Detailed analysis of their structural, electronic, and magnetic properties were performed to explore the effect of sublayer thickness on the magnetic structure and exchange coupling at (111)-oriented perovskite oxide interfaces. In the ultrathin limit (3-6 u.c.), we find that the antiferromagnetic (AF) properties of the LSFO sublayers are preserved with an out-of-plane canting of the AF spin axis, while the ferromagnetic (FM) properties of the LSMO sublayers are significantly depressed. For thicker LSFO layers (>9 u.c.), the out-of-plane canting of the AF spin axis is only present in superlattices with thick LSMO sublayers. In conclusion, exchange coupling in the form of spin-flop coupling exists only in superlattices which display both robust ferromagnetism and out-of-plane canting of the AF spin axis.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1329130

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 10 Vol. 93; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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