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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
Diamond Keywords: Spintronics
Subject Areas:
Physics,
Materials
Instruments:
I06-Nanoscience
Added On:
29/10/2013 17:33
Discipline Tags:
Surfaces
Physics
Electronics
Magnetism
Materials Science
Technical Tags:
Microscopy
Spectroscopy
Electron Microscopy (EM)
PhotoEmmission Electron Microscopy (PEEM)
Circular Dichroism (CD)
X-ray Magnetic Circular Dichroism (XMCD)