Direct measurement of strain effects on magnetic and electrical properties of epitaxial SrRuO3 thin films

Gan, Q.; Rao, R. A.; Eom, C. B.; Garrett, J.L.; Lee, Mark

doi:10.1063/1.120603

Cited by 276 publications

(234 citation statements)

References 15 publications

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“…This definition gives a value for T c which is close to the one that was determined using the intersection point. The Curie temperature T c in bulk samples is 160 K, whereas in our thin film specimen it is reduced by about 15 K. This shift is in agreement with XRD results and may be explained by the presence of lattice strain in the film 34,38 and/or the nonstoichiometry effect. 19 Resonant UPS experiments were performed in the synchrotron radiation laboratory HASYLAB, Hamburg (Germany).…”

Section: Methodssupporting

confidence: 79%

Ab initioand photoemission study of correlation effects in SrRuO3thin films

et al. 2013

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We present the experimental and theoretical study of correlation effects in epitaxial SrRuO 3 thin films. Experimentally, we have performed resonant ultraviolet photoemission spectroscopy (UPS) and angle-resolved hard x-ray photoemission spectroscopy (HAXPES) measurements. For resonant UPS, the two methods, Fanoprofile fitting of constant initial state spectra and the energy distribution curves equidistant difference spectra, were used to extract Ru 4d partial spectral weight (PSW) in the valence band. We find Ru 4d PSW possessing a clearly pronounced coherent peak at the Fermi level together with angle-resolved HAXPES spectra demonstrating no difference in surface and bulk electronic structure. From comparison of experimental data with theoretical calculations done at density functional theory level, we conclude that SrRuO 3 is a weakly correlated material and electronic structure of it can be consistently described employing first-principles approaches.

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Section: Methodssupporting

confidence: 79%

Ab initioand photoemission study of correlation effects in SrRuO3thin films

et al. 2013

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“…The amplitude reduction is caused by the contractive magnetic contribution to the stress driving the SL oscillations. Such a contribution originates from the strong magneto-volume effect present in bulk [36] and nanolayered SRO [37]. At T = 20 K, the magnetostriction reaches a very high value of approximately η mag = 2.5 × 10 −3 , in quantitative agreement with the expected magnitude for SRO nanolayers grown on STO substrate [37].…”

Section: Ultrafast Magnetostriction In Srosupporting

confidence: 73%

Ultrafast structural dynamics of perovskite superlattices

et al. 2009

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Femtosecond x-ray diffraction provides direct insight into the ultrafast reversible lattice dynamics of materials with a perovskite structure. Superlattice (SL) structures consisting of a sequence of nanometer-thick layer pairs allow for optically inducing a tailored stress profile that drives the lattice motions and for limiting the influence of strain propagation on the observed dynamics. We demonstrate this concept in a series of diffraction experiments with femtosecond time resolution, giving detailed information on the ultrafast lattice dynamics of ferroelectric and ferromagnetic superlattices. Anharmonically coupled lattice motions in a SrRuO 3 /PbZr 0.2 Ti 0.8 O 3 (SRO/PZT) SL lead to a switch-off of the electric polarizations on a time scale of the order of 1 ps. Ultrafast magnetostriction of photoexcited SRO layers is demonstrated in a SRO/SrTiO 3 (STO) SL.

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confidence: 99%

“…In this paper, we will describe the orientation of the SRO in terms of the pseudocubic lattices parameters a bulk = b bulk = c bulk = 3.93Å. [15,16] These lattice parameters are rotated 45 • from the orthorhombic, nearly cubic lattice parameters a bulk = 5.57Å, b bulk = 5.53Åand c bulk ≈ 7.84Å.All SrRuO 3 films exhibited good epitaxy, as indicated by the X-Ray Diffraction (XRD) spectra that showed only SrRuO 3 film peaks with the same orientation as the underlying substrates. Films had excellent crystallinity with typical mosaic spreads of approximately 0.06 • on (001) STO, 0.11 • on 001 LSAT and 0.45 • on (001) LAO.…”

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confidence: 99%

Enhanced magnetism in epitaxial SrRuO3 thin films

Grutter

Wong

Arenholz

et al. 2010

Applied Physics Letters

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We have observed enhanced magnetization in epitaxial SrRuO3 thin films compared to previously reported bulk and thin film values of 1.1-1.6 µB/Ru ion. The degree of enhancement is strongly dependent on the lattice distortions imposed on the SrRuO3 films by SrTiO3, (LaAlO3)0.3(SrTaO3)0.7 (LSAT), and LaAlO3 substrates. A larger enhancement of magnetization for coherently strained SrRuO3 films on SrTiO3 and LSAT compared to fully relaxed films on LaAlO3 confirms the importance of the strain state in determining the magnetic ground state of the Ru ion. In particular, SrRuO3 films on (111) SrTiO3 exhibit exhanced moments as high as 3.8 µB/Ru ion, thus suggesting the stabilization of a high-spin Ru 4+ state.Transition metal complex oxides comprise a fundamentally intriguing and technonologically promising family of materials with a wide range of properties. The tunability of these properties via lattice distortions has been studied in detail in bulk and thin film form. While in the past it has often been difficult to separate out the effects of microstructure and defects from those of strain in epitaxial films, recent advances in atomically precise complex oxide thin film deposition techniques make it possible.Among the transition metal oxides, SrRuO 3 (SRO) is unique in that it is a 4d transition metal oxide that exhibits ferromagnetism and metallic conductivity. It has a distorted perovskite structure with a pseudocubic lattice parameter of 3.93Å.[1, 2] Bulk SrRuO 3 exhibits Curie temperature (T C ) ≈ 160 K and a moment of 1.1-1.6 µ B per Ru 4+ ion. [1,[3][4][5] These values are significantly reduced from the low-spin configuration value of 2 µ B /Ru 4+ ion. The reduction has been attributed to the delocalization of spin in an itinerant ferromagnet. SRO has also been identified as a technologically promising material as it has been incorporated both as an electrode in oxide devices and a structural template for other oxide films. [6][7][8][9] Recently, layer-by-layer growth of SrRuO 3 thin films has enabled the growth of near perfect epitaxial thin films. [10,11] However, the majority of this work examines films grown on (001) SrTiO 3 substrates. There has been some theoretical work that has predicted supressed magnetization for (i) SRO films under compressive epitaxial strain and (ii) SRO films compressed on the (110) plane in comparison with (001) SRO films.[12] Experimentally, remarkably little is known about the effects of the magnitude and symmetry of lattice distortions on the magnetization. [13,14] Epitaxial growth of SRO films provides model systems to study these distortions and their effects on magnetism.In this paper we demonstrate that magnetization can be enhanced in SRO films through lattice distortions generated by epitaxial strain. By modifying substrate choice and orientation as well as film thickness, we have systematically varied the magnitude and symmetry of the lattice distortions in SRO films imposed by the substrate. We find magnetization enhanced from bulk values that are consistent with the ...

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Direct measurement of strain effects on magnetic and electrical properties of epitaxial SrRuO3 thin films

Cited by 276 publications

References 15 publications

Ab initioand photoemission study of correlation effects in SrRuO3thin films

Ab initioand photoemission study of correlation effects in SrRuO3thin films

Ultrafast structural dynamics of perovskite superlattices

Enhanced magnetism in epitaxial SrRuO3 thin films

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