Valeria Lauter

Position: Lead Instrument Scientist

Instrument: Magnetism Reflectometer

Group: Thin Films and Nanostructures

Division: Quantum Condensed Matter Division

Facility: Spallation Neutron Source

Contact: lauterv@ornl.gov or (865) 387-5389

During her many years of experience in neutron scattering Valeria focused on reflectometry, off-specular scattering, and grazing incidence small angle scattering (GISANS) with polarized and unpolarized neutrons. Her professional experience in these fields covers both instrumentation and the physics of low-dimensional systems.

Valeria’s scientific research includes magnetic and non-magnetic nano-scale materials, magnetic anisotropy, interlayer coupling, GMR, interfacial structure, formation of domains, magnetisation reversal, determination of layer-by-layer magnetisation distribution, domain structure, self-organised organic structures with incorporated magnetic nanoparticles, high temperature superconducting films, and smart films.

In instrumentation Valeria’s professional skills relate to the development, construction, commissioning and performing of experiments on time-of-flight and monochromatic reflectometers. She participated in the commissioning phase of the reflectometer TROÏKA at the European Synchrotron Radiation Facility in Grenoble, France, in the construction and commissioning of the time-of-flight reflectometers with polarized neutrons SPN-1 and REMUR in Dubna, Russia, and took part in the elaboration of the initial project for the reflectometer D17 at ILL.

During her previous work as a Research Scientist at the Technical University of Munich, Germany and as a Visiting Scientist at the Institute Laue-Langevin in Grenoble, France she developed and applied magnetic and non-magnetic off-specular scattering and GISANS to nano-scale materials, performed experiments on magnetic GMR multilayers, polymer nanostructure composite films, remanent supermirrors, and superconducting films.

Valeria lead the project on the development of highly organized nanostructured composite films and created new meso-phases in self-assembled structures using magnetic nanoparticles and block-copolymers, revealing nanoparticle–induced structural transition with the increasing size and volume fraction of nanoparticles.

She held the position of Research Scientist at the University of Konstanz, Germany and investigated superconducting thin films (YBaCu3O7 and Nb) in a parallel external magnetic field in the Meissner state (H < Hc1) and in the mixed state (Hc1<H < Hc2), revealing the flux-line row transition in the mixed state.

As a Research Scientist at the Laboratoire de Magnetisme CNRS in Grenoble, France Valeria applied polarized neutron reflectometry to the problems of low dimensional magnetism, studied hybridization effects on the ground state magnetic moments of the ferromagnetic monolayers in W/Fe/W films, and studied polarization of non-magnetic materials in close contact with strong magnetic materials, in particular in Pd/Co/Pd films.

Earlier Valeria held the position of Staff Scientist at the Joint Institute for Nuclear Research in Dubna, Russia where she took part in the construction and commissioning of the time-of-flight reflectometer with polarized neutrons. She performed experimental and theoretical investigations of polarized mirrors and bent polarizing neutron guides for time-of-flight technique, optimizing the absorbing sub-layers for polarizers.

She has published more that 60 research articles in international journals and review articles, presented many invited lectures at international conferences, seminars, schools, and organized several international conferences and workshops.

She is a Referee for the Journals of Physical Review Letters and Physical Review B, Langmuir, Journal of Magnetism and Magnetic Materials.

Education

PhD in Experimental and Theoretical Solid State Physics - Joint Institute for Nuclear Research in Dubna, Russia

Selected Publications

V. Lauter-Pasyuk “Neutron grazing incidence technique for nanoscience” (French version, PDF) Journal de Physique IV, Collection SFN 7, s221-s240, 2007
H. Lauter, V.Lauter-Pasyuk “A discussion about inelastic surface scattering” Journal of Physical Research, V.14, No 3, pages 239-250, 2006
V.V. Ustinov, M.A.Milyaev, L.N. Romashev, T.P. Krinitsina, A.M. Burkhanov, V.V.Lauter-Pasyuk, H.J.Lauter Multi-stepwise GMR and layers magnetic reversal in uniaxial Fe/Cr superlattices Phys. Stat. Sol. (c) 3, No 5, 1249 – 1256, 2006
V.V. Ustinov, M.A. Milyaev, L.N. Romashev, T.P. Krinitsina, A.M. Burkhanov, V.V.Lauter-Pasyuk, H.J.Lauter Multiple spin-flip transitions and stairs-like GMR in Fe/Cr superlattices with uniaxial in-plane anisotropy Journal of Magnetism and Magnetic Materials 300, e-281, 2006
V. Lauter-Pasyuk, H.J. Lauter, G.P. Gordeev, P. Muller-Buschbaum, B.P Toperverg, M. Jernenkov, W. Petry Nanoparticles in block-copolymer films studied by specular and off-specular neutron scattering Langmuir, 19, 7783-7788, 2003
V. Lauter-Pasyuk, H.J. Lauter, B. Toperverg, L. Romashev, V. Ustinov Transverse and lateral structure of the spin-flop phase in Fe/Cr antiferromagnetic superlattices Phys. Rev. Lett. 89, 167203, 2002