Full first-principles simulations on 180º stripe domains in realistic ferroelectric capacitors Pablo Aguado-Puente Javier Junquera.

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Presentation transcript:

Full first-principles simulations on 180º stripe domains in realistic ferroelectric capacitors Pablo Aguado-Puente Javier Junquera

Technological applications: ABO 3 perovskites oxides, promising candidates for NV-FRAM metal (SrTiO 3 -Nb, SrRuO 3,Pt) perovskite oxide (PZT,BST) The use as a NV-FRAM depends on the existence of a polar ground state … … is there a fundamental limit?

PTO: PbTiO 3 PZT: Pb(Zr,Ti)O 3 BTO: BaTiO 3 TGS: tryglycine sulphate PVDF: Ferroelectric polymer Bune et al. (PVDF) Ph. Ghosez and J. Junquera, First-Principles Modeling of Ferroelectric Oxide Nanostructures, Handbook of Theoretical and Computational Nanotechnology, Vol. 9, Chap. 13, (2006) ( and references therein. Courtesy of H. Kohlstedt Fundamental motivation: what’s the most stable phase for epitaxial ferroelectric ultrathin films? Long time question. Hot field. ?

PbTiO 3 SrTiO 3 (insulator) d a PbTiO 3 Nb-SrTiO 3 (metal) d PbZr 0.2 Ti 0.8 O 3 SrRuO 3 SrTiO 3 PbTiO 3 SrTiO 3 (insulator) d D. D. Fong et al. (2004) S. K. Streiffer et al. (2002) C. Lichtensteiger et al. (2005) A. T. J. van Helvoort et al. (2005) D. D. Fong et al. (2005) V. Nagarajan et al. (2006) Experimentally: small changes in boundary conditions, great changes in ground state

Mechanical Electrostatic Surface Finite conductivity Defects (vacancies, misfit dislocations…) Chemistry Many effects might alter the delicate balance between long and short range forces Experimental measures, global result

Mechanical Electrostatic Surface Finite conductivity Defects (vacancies, misfit dislocations…) Chemistry First-principles calculations allow to isolate their respective influence

● Uniform reduction of the polarization real electrode P’P’ EdEd Junquera and Ghosez, (2003) Umeno et al. (2006) Present work Until today, monodomain studies, goal of this work: ab initio multidomain simulations ● Break down into domains Full first-principles simulation using Explicitly included electrodes. P bulk

Ferroelectric layer: fundamental parameters of the simulations N x = domain period FE layer: N x repetitions in [100] direction and m cells in [001] direction m = layer thickness N x from 2 to 8 cells m from 2 to 4 cells FE layer made of BaTiO 3. Domain wall in BaO and TiO 2

Building the cell: the paraelectric unit cell m = 2 unit cells Sr Ru O Ti Ba BaTiO 3 SrRuO 3 SrTiO 3 Short-circuit boundary conditions Mirror symmetry plane [100] [001] N at = 40 atoms a = a SrTiO 3 Building the reference cell following the scheme of Junquera and Ghosez (2003).

N at = N x · 40 atoms Building the cell: replicating the paraelectric structure N x repetitions in [100] direction. The energies of these cells as references.

N at = N x · 40 atoms Building the cell: inducing a polarization by hand Chosing a domain wall. Inducing a polarization by hand in the FE layer displacing the atoms a percentage of the bulk soft mode.

Forces smaller than 0.01 eV/Å No constraints impossed on the atomic positions Relaxing all the atomic coordinates coordinates, both in the FE layer and the electrodes

Results: multidomain phases more stable than paraelectric structure for N x > 4 2-unit-cells thick BaTiO 3 layer

N x = 4 BaO domain walls C. Kittel (1971) Ferromagnetic domains Results: multidomain phases more stable than paraelectric structure for N x > 4 N x = 4 BaO domain walls

N x =4 BaO wall TiO 2 wall BaO wall N x =6 Results: multidomain phases more stable than paraelectric structure for N x > 4 2-unit-cells thick BaTiO 3 layer

Resulting phases show in-plane displacements and small polarization N x = 4 BaO domain walls Small polarization inside the domains. About 1/10 of bulk soft-mode polarization Sr Ru O Ti Ba

In-plane displacements are essential to get polarization domains In-plane displacements: ONIn-plane displacements: OFF When in-plane coordinates are fixed, structure goes back to the paraelectric phase

Changing the electrode, the ground state of PbTiO 3 changes from monodomain to polydomain Lichtensteiger, Triscone, Junquera, Ghosez. Lichtensteiger, et al.

Transition from vortices to standard 180º domains. 4-unit-cell thick layer, great increase in polarization Displacements 10 times bigger than in the 2-cells thick layer m = 4, N x = 4 TiO 2 domain walls Sr Ru O Ti Ba (E-E para )/N x < meV

Conclusions The chemical interaction through the interface is an essential factor since it affects the in-plane mobility of the atoms. There are stable multidomain phases in ultrathin FE films. Closure domains in FE capacitors are predicted. Slides available at: Contact:

More information …

Method: Computational details First-principles calculations within Kohn-Sham Density Functional Theory (DFT) Exchange-correlation functional : LDA, fit to Ceperley-Alder data Norm conserving pseudopotentials: Ti, Sr, Ba, Ru: semicore in valence Basis set: NAO: valence: Double-  + Polarization ; semicore: Single-  Real-space grid cutoff : 400 Ry k-point grid : equivalent to 12x12x12 for simple cubic perovskite Supercell geometry : Numerical Atomic Orbital DFT code. J. M. Soler et al., J. Phys. Condens. Matter 14, 2745 (2002 )

Very small energy differences, very accurate simulations needed m=2, N x = 4 BaO domain walls StructureTotal Energy (eV) Paraelectric Multidomain (E-Epara)/Nx = eV