Tuning La0.67Sr0.33MnO3 surface magnetism using LaMnO3 and SrTiO3 caps

DOI: 10.1016/j.jmmm.2013.10.024

Authors: L. C. Phillips (University of Cambridge) , F. Maccherozzi (Diamond Light Source) , X. Moya (University of Cambridge) , M. Ghidini (University of Cambridge) , W. Yan (University of Cambridge) , J. Soussi (University of Cambridge) , S. S. Dhesi (Diamond Light Source) , N. D. Mathur (University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Magnetism And Magnetic Materials

State: Published (Approved)
Published: October 2013
Diamond Proposal Number(s): 6857 , 1773

Abstract: We have investigated how the surface magnetism of epitaxial La0.67Sr0.33MnO3 films on NdGaO3 substrates is modified by 2 nm-thick caps of the undoped manganite LaMnO3 and the band insulator SrTiO3. Low-temperature photoemission electron microscopy images with x-ray magnetic circular dichroism contrast reveal large ferromagnetic domains, and a reduction of surface Curie temperature by 40 K (LaMnO3 cap) and 70 K (SrTiO3 cap). We use these negative results to argue that capped films of sub-optimally doped La1−xSrxMnO3 (x≠0.33) should improve the operating temperature of all-oxide and other spintronic devices.

Journal Keywords: Curie Point; Doped Materials; Electron Microscopy; Emission Spectroscopy; Films; Lanthanum Compounds; Magnetic Circular Dichroism; Magnetism; Manganates; Oxides; Photoelectron Spectroscopy; Photoemission; Strontium Titanates; Substrates; Surfaces; X Radiation

Subject Areas: Physics


Instruments: I06-Nanoscience