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Title: Oscillatory noncollinear magnetism induced by interfacial charge transfer in superlattices composed of metallic oxides

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [5] ;  [5] ;  [6] ;  [5] ;  [5] ;  [4] ;  [5] ;  [3] ;  [5]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Harvard Univ., Cambridge, MA (United States); Univ. of British Columbia, Vancouver, BC (Canada)
  2. National Institute of Standards and Technology, Gaithersburg, MD (United States)
  3. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
Publication Date:
Report Number(s):
BNL-113488-2017-JA
Journal ID: ISSN 2160-3308; PRXHAE; 129909; TRN: US1701218
Grant/Contract Number:
AC02-06CH11357; AC02-98CH10886; SC00112704
Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Volume: 6; Journal Issue: 4; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
National Institute of Standards and Technology (NIST); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences and Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1333326
Alternate Identifier(s):
OSTI ID: 1339701; OSTI ID: 1342652