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

DOI: 10.1103/PhysRevX.6.041038 DOI Help

Authors: Jason D. Hoffman (Argonne National Laboratory) , Brian J. Kirby (National Institute of Standards and Technology) , Jihwan Kwon (University of Illinois at Urbana-Champaign) , Gilberto Fabbris (Brookhaven National Laboratory) , D. Meyers (Brookhaven National Laboratory) , John W. Freeland (Advanced Photon Source) , Ivar Martin (Argonne National Laboratory) , Olle G. Heinonen (Argonne National Laboratory) , Paul Steadman (Diamond Light Source) , Hua Zhou (Advanced Photon Source) , Christian M. Schlepütz (Advanced Photon Source) , Mark P. M. Dean (Brookhaven National Laboratory) , Suzanne G. E. Te Velthuis (Argonne National Laboratory) , Jian-min Zuo (University of Illinois at Urbana-Champaign) , Anand Bhattacharya (Argonne National Laboratory)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review X , VOL 6

State: Published (Approved)
Published: November 2016
Diamond Proposal Number(s): 9626

Abstract: 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. Our work suggests a new approach to engineering noncollinear spin textures in metallic oxide heterostructures.

Subject Areas: Materials, Physics

Instruments: I10-Beamline for Advanced Dichroism

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