Femtosecond X-ray diffraction from nanolayered oxides

Schmising, Clemens von Korff; Harpoeth, A.; Zhavoronkov, N.; Woerner, M.; Elsaesser, Thomas; Bargheer, Matias; Schmidbauer, M.; Vrejoiu, Ionela; Hesse, D.; Alexe, Marin

doi:10.1016/j.phpro.2010.01.044

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Domain wall velocities in ferroelectrics tend to be lower than those found in ferromagnetic systems, with a theoretical limit set by the speed of sound in the crystal [576]; experimental values range from 3.0 µm s −1 in LiNbO 3 crystals [622] to 0.01-100 m s −1 in PZT [621,623], while ultrafast switching of Pb(Nb 0.04 Zr 0.28 Ti 0.68 )O 3 (PNZT) ferroelectric capacitors (of about 220 ps for 4.5 µm × 5.4 µm in area and 200 nm thick) indicate domain wall velocities of the order of 1 km s −1 [624]. Schemes for the ultrafast switching of the ferroelectric polarization of displacive ferroelectrics are presently being investigated, either by using strain [625,626] or THz light pulses [627] resonant with the soft phonon mode, or by using non-resonant excitation via impulsive stimulated Raman scattering [628,629]. Such ultrafast processes could enable ferroelectric switching times down to the picosecond regime, although they are challenging due to the large electric fields required, which tend to exceed the damage threshold.…”

Section: Dynamics Of Multiferroic Systemsmentioning

confidence: 99%

Electric field control of magnetism in multiferroic heterostructures

Vaz¹

2012

J. Phys.: Condens. Matter

399

326

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We review the recent developments in the electric field control of magnetism in multiferroic heterostructures, which consist of heterogeneous materials systems where a magnetoelectric coupling is engineered between magnetic and ferroelectric components. The magnetoelectric coupling in these composite systems is interfacial in origin, and can arise from elastic strain, charge, and exchange bias interactions, with different characteristic responses and functionalities. Moreover, charge transport phenomena in multiferroic heterostructures, where both magnetic and ferroelectric order parameters are used to control charge transport, suggest new possibilities to control the conduction paths of the electron spin, with potential for device applications.

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Section: Dynamics Of Multiferroic Systemsmentioning

confidence: 99%

Electric field control of magnetism in multiferroic heterostructures

Vaz¹

2012

J. Phys.: Condens. Matter

399

326

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“…Femtosecond x-ray diffraction experiments have provided detailed insight into the dynamics of semiconductor 45 and perovskite SLs, [77][78][79][80][81][82][83][84][85] in the latter including ultrafast motions along different anharmonically coupled lattice coordinates. 79 Here, we present results for the ferromagnetic SRO/STO superlattice structure introduced in Fig.…”

Section: A Real-space Atomic Motions and Vibrational Dynamicsmentioning

confidence: 99%

Fitting coupled potential energy surfaces for large systems: Method and construction of a 3-state representation for phenol photodissociation in the full 33 internal degrees of freedom using multireference configuration interaction determined data

Zhu

Yarkony

2014

The Journal of Chemical Physics

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A recently reported algorithm for representing adiabatic states coupled by conical intersections using a quasi-diabatic state Hamiltonian in four and five atom systems is extended to treat nonadiabatic processes in considerably larger molecules. The method treats all internal degrees of freedom and uses electronic structure data from ab initio multireference configuration interaction wave functions with nuclear configuration selection based on quasi-classical surface hopping trajectories. The method is shown here to be able to treat ∼30 internal degrees of freedom including dissociative and large amplitude internal motion. Two procedures are introduced which are essential to the algorithm, a null space projector which removes basis functions from the fitting process until they are needed and a partial diagonalization technique which allows for automated, but accurate, treatment of the vicinity of extended seams of conical intersections of two or more states. These procedures are described in detail. The method is illustrated using the photodissociaton of phenol, C6H5OH(${\rm \tilde X}{}^{1} A^{\prime} $X̃1A′) + hv → C6H5OH($\tilde A{}^{1} A^{\prime} $Ã1A′, ${\rm \tilde B}{}^{\rm 1}{\rm A^{\prime \prime} }$B̃1A′′) → C6H5O(${\rm \tilde X}{}^2{\rm B}_1$X̃2B1, ${\rm \tilde A}{}^2{\rm B}_2$Ã2B2) + H as a test case. Ab initio electronic structure data for the 1,2,31A states of phenol, which are coupled by conical intersections, are obtained from multireference first order configuration interaction wave functions. The design of bases to simultaneously treat large amplitude motion and dissociation is described, as is the ability of the fitting procedure to smooth the irregularities in the electronic energies attributable to the orbital changes that are inherent to nonadiabatic processes.

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Perspective: Structural dynamics in condensed matter mapped by femtosecond x-ray diffraction

Elsaesser¹,

Woerner²

2014

The Journal of Chemical Physics

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Ultrashort soft and hard x-ray pulses are sensitive probes of structural dynamics on the picometer length and femtosecond time scales of electronic and atomic motions. Recent progress in generating such pulses has initiated new directions of condensed matter research, exploiting a variety of x-ray absorption, scattering, and diffraction methods to probe photoinduced structural dynamics. Atomic motion, changes of local structure and long-range order, as well as correlated electron motion and charge transfer have been resolved in space and time, providing a most direct access to the physical mechanisms and interactions driving reversible and irreversible changes of structure. This perspective combines an overview of recent advances in femtosecond x-ray diffraction with a discussion on ongoing and future developments.

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Femtosecond X-ray diffraction from nanolayered oxides

Cited by 4 publications

References 11 publications

Electric field control of magnetism in multiferroic heterostructures

Electric field control of magnetism in multiferroic heterostructures

Fitting coupled potential energy surfaces for large systems: Method and construction of a 3-state representation for phenol photodissociation in the full 33 internal degrees of freedom using multireference configuration interaction determined data

Perspective: Structural dynamics in condensed matter mapped by femtosecond x-ray diffraction

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