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Article Dans Une Revue Nature Materials Année : 2013

Crafting the Magnonic and Spintronic Response of BiFeO 3 Films by Epitaxial Strain

Jean Juraszek

Résumé

Multiferroics are compounds that show ferroelectricity and magnetism. BiFeO 3, by far the most studied, has outstanding ferroelectric properties, a cycloidal magnetic order in the bulk, and many unexpected virtues such as conductive domain walls or a low bandgap of interest for photovoltaics. Although this flurry of properties makes BiFeO 3 a paradigmatic multifunctional material, most are related to its ferroelectric character, and its other ferroic property - antiferromagnetism - has not been investigated extensively, especially in thin films. Here we bring insight into the rich spin physics of BiFeO 3 in a detailed study of the static and dynamic magnetic response of strain-engineered films. Using Mössbauer and Raman spectroscopies combined with Landau-Ginzburg theory and effective Hamiltonian calculations, we show that the bulk-like cycloidal spin modulation that exists at low compressive strain is driven towards pseudo-collinear antiferromagnetism at high strain, both tensile and compressive. For moderate tensile strain we also predict and observe indications of a new cycloid. Accordingly, we find that the magnonic response is entirely modified, with low-energy magnon modes being suppressed as strain increases. Finally, we reveal that strain progressively drives the average spin angle from in-plane to out-of-plane, a property we use to tune the exchange bias and giant-magnetoresistive response of spin valves. \textcopyright 2013 Macmillan Publishers Limited. All rights reserved.
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Dates et versions

hal-02269287 , version 1 (22-08-2019)

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D. Sando, Arsène Agbelele, D. Rahmedov, J. Liu, P. Rovillain, et al.. Crafting the Magnonic and Spintronic Response of BiFeO 3 Films by Epitaxial Strain. Nature Materials, 2013, 12 (7), pp.641-646. ⟨10.1038/nmat3629⟩. ⟨hal-02269287⟩
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