Journal
PHYSICAL REVIEW B
Volume 91, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.024406
Keywords
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Funding
- Swiss Nanoscience Institute, University of Basel
- Swiss National Science Foundation (SNF) [206021-139102, 200020-153660]
- EU's 7th Framework Program IFOX [NMP3-LA-2010 246102]
- Swiss National Science Foundation (SNF) [206021_139102, 200020_153660] Funding Source: Swiss National Science Foundation (SNF)
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We present a detailed study of the ferromagnetic/ferroelectric heterostructure La0.7Sr0.3MnO3/[Pb (Mg1/3Nb2/3)O-3](0.68)-[PbTiO3](0.32) (011), where reversible electrical switching induces a 10 K shift of the magnetic Curie temperature T-C. Two distinct polarization configurations can be set in the ferroelectric substrate and are stable at remanence; reciprocal space maps highlight the accompanying lattice parameter changes which impose a biaxial strain on the manganite thin film. The magnetic response to the strain changes is probed by temperature dependent Mn L-3,L-2 x-ray magnetic circular dichroism and resistance measurements. X-ray natural linear dichroism spectra for both strain states probe the valence charge anisotropy: The existing population imbalance between out-of-plane and in-plane oriented orbitals increases further with tensile strain, favoring orbital occupation in the surface plane. Multiplet and density functional theory calculations support the emerging picture that an increase in tensile in-plane strain leads to an increased energy difference between the two e(g) orbitals and a larger Mn-O-bond length. Increasing the electron-lattice coupling and reducing the e(g) electron itinerancy that leads to ferromagnetism due to double exchange coupling, results ultimately in lower T-C values.
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