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Title: Oscillatory Noncollinear Magnetism Induced by Interfacial Charge Transfer in Superlattices Composed of Metallic Oxides

Journal Article · · Physical Review. X

Interfaces between correlated complex oxides are promising avenues to realize new forms of magnetism that arise as a result of charge transfer, proximity effects, and locally broken symmetries. We report on the discovery of a noncollinear magnetic structure in superlattices of the ferromagnetic metallic oxide La2/3Sr1/3MnO3 (LSMO) and the correlated metal LaNiO3 (LNO). The exchange interaction between LSMO layers is mediated by the intervening LNO, such that the angle between the magnetization of neighboring LSMO layers varies in an oscillatory manner with the thickness of the LNO layer. The magnetic field, temperature, and spacer thickness dependence of the noncollinear structure are inconsistent with the bilinear and biquadratic interactions that are used to model the magnetic structure in conventional metallic multilayers. A model that couples the LSMO layers to a helical spin state within the LNO fits the observed behavior. We propose that the spin-helix results from the interaction between a spatially varying spin susceptibility within the LNO and interfacial charge transfer that creates localized Ni2+ states. In conclusion, our work suggests a new approach to engineering noncollinear spin textures in metallic oxide heterostructures.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Institute of Standards and Technology (NIST); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences and Engineering Division
Grant/Contract Number:
AC02-06CH11357; AC02-98CH10886; SC00112704
OSTI ID:
1333326
Alternate ID(s):
OSTI ID: 1339701; OSTI ID: 1342652
Report Number(s):
BNL-113488-2017-JA; PRXHAE; 041038
Journal Information:
Physical Review. X, Journal Name: Physical Review. X Vol. 6 Journal Issue: 4; ISSN 2160-3308
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 42 works
Citation information provided by
Web of Science

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Figures / Tables (5)