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Title

Observation of the strain induced magnetic phase segregation of manganite thin films

AuthorsMarín, Lorena; Rodríguez, Luis A.; Magen, Cesar; Snoeck, E.; Lucas, I.; Morellón, Luis; Algarabel, Pedro A. ; Teresa, José María de; Ibarra, M. Ricardo
KeywordsExchange bias
Electron holography
Phase segregation
Epitaxial thin films
Manganites
Strain engineering
Issue Date2015
PublisherAmerican Chemical Society
CitationNano Letters 15(1): 492-497 (2015)
AbstractEpitaxial strain alters the physical properties of thin films grown on single crystal substrates. Thin film oxides are particularly apt for strain engineering new functionalities in ferroic materials. In the case of La2/3Ca1/3MnO3 (LCMO) thin films, here we show the first experimental images obtained by electron holography demonstrating that epitaxial strain induces the segregation of a flat and uniform nonferromagnetic layer with antiferromagnetic (AFM) character at the top surface of a ferromagnetic (FM) layer, the whole film being chemical and structurally homogeneous at room temperature. For different substrates and growth conditions the tetragonality of LCMO at room temperature, defined as τ = |c – a|/a, is the driving force for a phase coexistence above an approximate critical value of τC ≈ 0.024. Theoretical calculations prove that the increased tetragonality changes the energy balance of the FM and AFM ground states in strained LCMO, enabling the formation of magnetically inhomogeneous states. This work gives the key evidence that opens a new route to synthesize strain-induced exchanged-biased FM–AFM bilayers in single thin films, which could serve as building blocks of future spintronic devices.
URIhttp://hdl.handle.net/10261/147972
DOI10.1021/nl503834b
Identifiersdoi: 10.1021/nl503834b
issn: 1530-6984
e-issn: 1530-6992
Appears in Collections:(ICMA) Artículos
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