Influence of chemical composition and crystallographic orientation on the interfacial magnetism in BiFeO3 / La1-xSrxMnO3 superlattices

Guo, Er-Jia; Roldan, Manuel A.; Sang, Xiahan; Okamoto, Satoshi; Charlton, Timothy R.; Ambaye, Haile Arena; Lee, Ho Nyung; Fitzsimmons, Michael R.

doi:10.1103/PhysRevMaterials.2.114404

Influence of chemical composition and crystallographic orientation on the interfacial magnetism in $BiFe O_{3}$ / $L a_{1 - x} S r_{x} Mn O_{3}$ superlattices

Journal Article · Tue Nov 13 00:00:00 EST 2018 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.2.114404· OSTI ID:1490596

^[1]; Roldan, Manuel A. ^[2]; ^[3]; ^[3]; ^[3]; ^[3]; ^[3]; ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)
Arizona State Univ., Tempe, AZ (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

The emergence of magnetism unique to the interface between the multiferroic BiFeO₃ (BFO) and ferromagnetic La_1-xSr_xMnO₃ (LSMO) offers an opportunity to control magnetism in nanoscale heterostructures with electric fields. Here, we investigate the influence of chemical composition and crystallographic orientation on the interfacial magnetism of BFO/LSMO superlattices. Our results reveal that the induced net magnetic moment in the BFO layers increases monotonically with increasing saturation magnetization of the LSMO layers. For the (100)-BFO/LSMO (x=0.2) superlattice, the induced moment reaches a record high value of ~2.8μ_B/Fe. No interfacial magnetization is observed at the (100)-BFO/LSMO interface when LSMO is an antiferromagnet. In contrast to (100)-oriented superlattices, no induced moment is observed in (111)-BFO layers. Our results suggest the interfacial structural reconstruction may not be a sufficient condition for the enhanced net moment in BFO layer. Instead, spin canting induced by interfacial exchange coupling is proposed in the (100)- but not in the (111)-BFO, leading to the large net magnetization at the (100)-oriented interface. Lastly, this work further demonstrates the importance of exchange coupling across heterointerfaces for spin canting in nominally antiferromagnets, providing a pathway to control the magnetic properties of artificial oxide heterostructures.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1490596

Alternate ID(s):: OSTI ID: 1481936

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 11 Vol. 2; ISSN PRMHAR; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Polarization screening-induced epitaxial growth and interfacial magnetism of BiFeO ₃ /PbTiO ₃ nanoplates Fu, Gangjie; Li, Wei; Cao, Haiwen CrystEngComm, Vol. 22, Issue 4 https://doi.org/10.1039/c9ce01862j	journal	January 2020
Progress in BiFeO ₃ -based heterostructures: materials, properties and applications Yin, Li; Mi, Wenbo Nanoscale, Vol. 12, Issue 2 https://doi.org/10.1039/c9nr08800h	journal	January 2020

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