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Strain Engineering of Octahedral Rotations and Physical Properties of SrRuO3 Films.

Lu W, Song W, Yang P, Ding J, Chow GM, Chen J - Sci Rep (2015)

Bottom Line: Octahedral behavior of SrRuO3 film as a popular electrode in heterostructured devices is of particular interest for its probable interfacial coupling of octahedra with the functional overlayers.It shows that the compressively strained film on NdGaO3 substrate displays a rotation pattern of a tetragonal phase whilst the tensilely strained film on KTaO3 substrate has the rotation pattern of the bulk orthorhombic SrRuO3 phase.In addition, the compressively strained film displays a perpendicular magnetic anisotropy while the tensilely strained film has the magnetic easy axis lying in the film plane.

View Article: PubMed Central - PubMed

Affiliation: 1] Department of Materials Science and Engineering, National University of Singapore, Singapore 117576 [2] Data Storage Institute, A*STAR (Agency for Science, Technology and Research), DSI Building, 5 Engineering Drive 1, Singapore 117608.

ABSTRACT
Strain engineering is an effective way to modify functional properties of thin films. Recently, the importance of octahedral rotations in pervoskite films has been recognized in discovering and designing new functional phases. Octahedral behavior of SrRuO3 film as a popular electrode in heterostructured devices is of particular interest for its probable interfacial coupling of octahedra with the functional overlayers. Here we report the strain engineering of octahedral rotations and physical properties that has been achieved in SrRuO3 films in response to the substrate-induced misfit strains of almost the same amplitude but of opposite signs. It shows that the compressively strained film on NdGaO3 substrate displays a rotation pattern of a tetragonal phase whilst the tensilely strained film on KTaO3 substrate has the rotation pattern of the bulk orthorhombic SrRuO3 phase. In addition, the compressively strained film displays a perpendicular magnetic anisotropy while the tensilely strained film has the magnetic easy axis lying in the film plane. The results show the prospect of strain engineered octahedral architecture in producing desired property and novel functionality in the class of perovskite material.

No MeSH data available.


Related in: MedlinePlus

Schematic of the RuO6 octahedral rotation when the SRO is (a) compressive strained, (b) in bulk, (c) tensile strained or (d) partially relaxed. Ru atoms and O atoms are in green and orange respectively. Pseudocubic unit cell of the substrates is represented by blue squares. The relationship between pseudocubic lattice parameters of SRO and the substrates mentioned in this paper is shown in (e).
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f1: Schematic of the RuO6 octahedral rotation when the SRO is (a) compressive strained, (b) in bulk, (c) tensile strained or (d) partially relaxed. Ru atoms and O atoms are in green and orange respectively. Pseudocubic unit cell of the substrates is represented by blue squares. The relationship between pseudocubic lattice parameters of SRO and the substrates mentioned in this paper is shown in (e).

Mentions: In this study, two substrates – (110) NdGaO3 (NGO) and (001) KTaO3 (KTO) - that have the lattice mismatch of almost the same magnitude but of opposite sign were chosen to grow the SRO films. The film underwent compressive strain of −1.7% when grown on (110) NGO substrate and tensile strain of+1.5% when grown on (001) KTO substrates. We found that the compressive and tensile strains showed different effects on the octahedral rotation of SRO. The schematic drawing of the effects of various strains on octahedral rotation of SRO films is shown in Fig. 1. An enhanced octahedral rotation about the out-of-plane axis would result from the compressive strain (see Fig. 1(a)), leading to a distorted orthorhombic lattice of SRO film on (001) STO substrate911 and perpendicularly oriented tetragonal SRO phase as found in SRO film on (110) NGO substrate. On the other hand, the tensile strain has the effect of stretching the corner connected octahedral network, leading to the diminished rotations of octahedra about the out-of-plane direction (Fig. 1(c)), as has been reported of SRO film on GSO substrate10. Further increasing the tensile strain however, leads to a relaxed bulk-like SRO phase, which is the case of SRO film grown on KTO substrate (Fig. 1(d)). The octahedral response to different strains in SRO films has emerged as a critical step towards a better understanding of octahedral behavior in other strained perovskite films, and may allow for the manipulation of octahedral-behavior-related functionalities by strain engineering.


Strain Engineering of Octahedral Rotations and Physical Properties of SrRuO3 Films.

Lu W, Song W, Yang P, Ding J, Chow GM, Chen J - Sci Rep (2015)

Schematic of the RuO6 octahedral rotation when the SRO is (a) compressive strained, (b) in bulk, (c) tensile strained or (d) partially relaxed. Ru atoms and O atoms are in green and orange respectively. Pseudocubic unit cell of the substrates is represented by blue squares. The relationship between pseudocubic lattice parameters of SRO and the substrates mentioned in this paper is shown in (e).
© Copyright Policy - open-access
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4446894&req=5

f1: Schematic of the RuO6 octahedral rotation when the SRO is (a) compressive strained, (b) in bulk, (c) tensile strained or (d) partially relaxed. Ru atoms and O atoms are in green and orange respectively. Pseudocubic unit cell of the substrates is represented by blue squares. The relationship between pseudocubic lattice parameters of SRO and the substrates mentioned in this paper is shown in (e).
Mentions: In this study, two substrates – (110) NdGaO3 (NGO) and (001) KTaO3 (KTO) - that have the lattice mismatch of almost the same magnitude but of opposite sign were chosen to grow the SRO films. The film underwent compressive strain of −1.7% when grown on (110) NGO substrate and tensile strain of+1.5% when grown on (001) KTO substrates. We found that the compressive and tensile strains showed different effects on the octahedral rotation of SRO. The schematic drawing of the effects of various strains on octahedral rotation of SRO films is shown in Fig. 1. An enhanced octahedral rotation about the out-of-plane axis would result from the compressive strain (see Fig. 1(a)), leading to a distorted orthorhombic lattice of SRO film on (001) STO substrate911 and perpendicularly oriented tetragonal SRO phase as found in SRO film on (110) NGO substrate. On the other hand, the tensile strain has the effect of stretching the corner connected octahedral network, leading to the diminished rotations of octahedra about the out-of-plane direction (Fig. 1(c)), as has been reported of SRO film on GSO substrate10. Further increasing the tensile strain however, leads to a relaxed bulk-like SRO phase, which is the case of SRO film grown on KTO substrate (Fig. 1(d)). The octahedral response to different strains in SRO films has emerged as a critical step towards a better understanding of octahedral behavior in other strained perovskite films, and may allow for the manipulation of octahedral-behavior-related functionalities by strain engineering.

Bottom Line: Octahedral behavior of SrRuO3 film as a popular electrode in heterostructured devices is of particular interest for its probable interfacial coupling of octahedra with the functional overlayers.It shows that the compressively strained film on NdGaO3 substrate displays a rotation pattern of a tetragonal phase whilst the tensilely strained film on KTaO3 substrate has the rotation pattern of the bulk orthorhombic SrRuO3 phase.In addition, the compressively strained film displays a perpendicular magnetic anisotropy while the tensilely strained film has the magnetic easy axis lying in the film plane.

View Article: PubMed Central - PubMed

Affiliation: 1] Department of Materials Science and Engineering, National University of Singapore, Singapore 117576 [2] Data Storage Institute, A*STAR (Agency for Science, Technology and Research), DSI Building, 5 Engineering Drive 1, Singapore 117608.

ABSTRACT
Strain engineering is an effective way to modify functional properties of thin films. Recently, the importance of octahedral rotations in pervoskite films has been recognized in discovering and designing new functional phases. Octahedral behavior of SrRuO3 film as a popular electrode in heterostructured devices is of particular interest for its probable interfacial coupling of octahedra with the functional overlayers. Here we report the strain engineering of octahedral rotations and physical properties that has been achieved in SrRuO3 films in response to the substrate-induced misfit strains of almost the same amplitude but of opposite signs. It shows that the compressively strained film on NdGaO3 substrate displays a rotation pattern of a tetragonal phase whilst the tensilely strained film on KTaO3 substrate has the rotation pattern of the bulk orthorhombic SrRuO3 phase. In addition, the compressively strained film displays a perpendicular magnetic anisotropy while the tensilely strained film has the magnetic easy axis lying in the film plane. The results show the prospect of strain engineered octahedral architecture in producing desired property and novel functionality in the class of perovskite material.

No MeSH data available.


Related in: MedlinePlus