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Point contact investigations of film and interface magnetoresistance of La0.7Sr0.3MnO3 heterostructures on Nb:SrTiO3
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2015 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 374, 433-439 p.Article in journal (Refereed) Published
Abstract [en]

STM based magnetotransport measurements of epitaxial La0.7Sr0.3MnO3 31 nm thick films with and without an internal LaMnO3 layer (0-3.1 nm thick) grown on Nb doped SrTiO3 are presented. The measurements reveal two types of low field magnetoresistance (LFMR) with a magnitude of similar to 0.1-1.5%. One LFMR contribution is identified as a conventional grain boundary/domain wall scattering through the symmetric I-V characteristics, high dependence on tip placements and insensitivity to introduction of LaMnO3 layers. The other contribution originates from the reverse biased Nb doped SrTiO3 interface and the interface layer of La0.7Sr0.3MnO3. Both LFMR contributions display a field dependence indicative of a higher coercivily (similar to 200 Oe) than the bulk film. LaMnO3 layers are found to reduce the rectifying properties of the junctions, and sub micron lateral patterning by electron beam lithography enhances the dioclic properties, in accordance with a proposed transport model based on the locality of the injected current.

Place, publisher, year, edition, pages
2015. Vol. 374, 433-439 p.
Keyword [en]
LSMO, LMO, Thin film, Point contact, Magnetoresitance, Interface
National Category
Physical Sciences Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-239724DOI: 10.1016/j.jmmm.2014.08.089ISI: 000344949000070OAI: oai:DiVA.org:uu-239724DiVA: diva2:775783
Available from: 2015-01-05 Created: 2014-12-30 Last updated: 2017-12-05Bibliographically approved

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Nordblad, PerMathieu, Roland

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