Valentyn Grachov (Grachev), Ph.D
Senior Research Scientist
Selected Honors, Awards, and Public Outreach/Service:
Manuscript reviewer for: Phys. Rev. and Phys. Rev. Letters, J. Phys. Chem. Sol., J. Phys.: Cond. Matters, Phys. Stat. Sol., J. Magn. Res., Appl. Magn.Res., Sov. Solid State Physics.
Education and academic degrees
Professor (Honour degree), Institute for Problems of Materials Sciences, Ukraine
Doctor of Sciences (Habilitation, Phys. and Math.); Inst. of Semiconductors, Kiev, Ukraine
Candidate of Sciences (Ph.D., Phys. and Math.); Inst. of Semiconductors, Kiev, Ukraine
M.Sc. in Physics (Theoretical physics), State University, Kiev, Ukraine
Career / Employment
2002 – to present Senior Research Scientist, Physics Department, Montana State
University, Bozeman, USA
1997 - 2002 Research Scientist, Osnabrück University, Germany
1994-1996 1. Physikalische Institut der J.-L. Universität Giessen, Germany
1989-1994 Leading Researcher, Institute for Materials Sciences, Kiev, Ukraine
1965-1989 Leading Researcher, Senior Researcher, Researcher, Engineer, Institute of Semiconductors, Ukrainian Academy of Sciences, Ukraine
Visiting professor / visting researcher
- University Aix-Marseille 3, Marseille, France. 1994-1995, 2000
- Department of Physics, Osnabrück University, Germany. 1992, 1997.
- Huygens Laboratory, Leiden University, Leiden, The Netherlands. 1995
- Physikalische Institut der J.-L. Universität Giessen, Giessen, Germany 1992-1993
- Institute of Physics CS AS, Prague, Czech Republic. 1992-1993
- Theory of Electron Paramagnetic Resonance (EPR), Nuclear Magnetic Resonance (NMR) and Electron Nuclear Double Resonance (ENDOR)
- Low-symmetry effects, hidden and/or gauge symmetries in the spin- and other Hamiltonians of high-spin paramagnetic defects and molecular magnets and low-dimensional magnetic clusters with anisotropic interactions
- Magnetic resonance of extrinsic, intrinsic and radiation defects in inorganic and organic materials (together with experimentalists)
- Phenomenological and microscopic theories of defect properties
- Multifrequency magnetic resonance spectroscopy of regularly ordered (crystals), partly ordered (fibers, nanostructures, layered materials) and disordered systems (organic materials, powders),
- Computer simulation and development of methods for experimental data treatment.
- G.Malovichko, V.Bratus, V.Grachev, E.Kokanyan. Electron paramagnetic resonance and electron-nuclear double resonance study of nonequivalent Yb3+ centers in congruent and nearly stoichiometric lithium niobate. Physica Status Solidi (b): 246, No. 1, 215-225 (2009).
- G.Malovichko, V.Grachev, J.Jorgensen, M.Meyer, M.Munro, B.Todt, I.Vrable, E.Kokanyan, V.Bratus and S.Okulov. Magnetic resonance study of non-equivalent centers created by 4f-ions in congruent and stoichiometric lithium niobate. MRS Proceedings. 1111. D01-03 (2009).
- G.Malovichko, V.Bratus, M.Munro, E.Kokanyan, S.Okulov,V.Grachev. Multifrequency spectroscopy of laser active centers Nd3+ and Yb3+ in nearly stoichiometric LiNbO3. Physica Status Solidi (c), 4, 1346-1351 (2007).
- G.Malovichko, V.Grachev, T.Rust, V.Pankratov. Flight to Mars and radiation defects in Li2B4O7and KTiOPO4. Physica Status Solidi (c), 4, 1288-1292 (2007).
- G.Malovichko, R.Petersen, Ch.Bäuman, V.Grachev. Second axial Fe3+ center in stoichiometric lithium tantalate. Journal of Applied Physics, 100, 023911 (2006)
- B.Briat, V.G.Grachev, G.I.Malovichko, O.F.Schirmer, M.Wöhlecke. Defects in inorganic photorefractive materials and their investigations. Chapter in the book “Springer Series in Optical Sciences, v. 114: Photorefractive Materials and Applications 2”, ed. by P.Gunter and J.-P.Huignard, pp. 9-49 (2006).
- G.Malovichko, V.Grachev, S.Okulov, E.Kokanyan, F.Henecker, A.Hofstaetter, O.Schirmer. EPR of Nd3+ in congruent and nearly stoichiometric lithium niobate. Physica Status Solidi (b), 243, 409-415 (2006).
- G.Malovichko, V.Grachev, O.Schirmer. Multifrequency spectroscopy of defects in complex oxides. Physica Status Solidi (a), 202, No. 2, 207-221 (2005).
- NSF, “Multifrequency spectroscopy of rare-earth and transition ions in optical materials”
- NASA “Point defects created by radiation in non-linear optical crystals used for space-based laser systems”
- DURIP DoD, “Multifrequency system for the study of defects in solids”
- National Foundation of Science and Advanced Technologies / CRDF, USA “Periodically poled lithium niobate crystals - application to wavelength-conversion devices”.
- NASA EPSCoR “Thermal stability of radiation defects in non-linear optical crystals”
- Montana Board of Research and Commercialization Technology, “Development of advanced materials for optoelectronics and optical communication technologies”
- NASA “Identification of atomic defects due to radiation in non-linear optical crystals used for space-based laser systems”
- NSF, “Impurity locations and mechanisms of charge compensation in stoichiometric lithium niobate and lithium tantalate crystals”
- V.Grachev, J.Jorgensen, M.Meyer, V.Pankratov, Ya.Burak, A.Hunt, G.Malovichko. Trace Impurities, Intrinsic and Radiation Defects in Oxide Materials. International Scientific Workshop. "Oxide Materials for Electronic Engineering - fabrication, properties and application". Lviv, Ukraine (2009).
- V.Grachev, G. Malovichko. Theory of magnetic resonance of ferroelectrics and multiferroics. NSF EPSCoR STC Workshop, Fayetteville, Arkansas, USA (2008).
- G.Malovichko, V.Bratus, E.Kokanyan, M.Meyer, M.Munro, S.Okulov, I.Vrable, V.Grachev. Magnetic Resonance of Rare-Earth Impurities in Lithium Niobate. Workshop “Storage and Manipulation of Quantum Information in Optically-Addressed Solids”, Bozeman, Montana, USA (2008).
- V.Grachev, G.Malovichko, T.Rust. Flight to Mars and radiation defects in oxides. Europhysical Conference on Defects in Insulating Materials (EURODIM 2006), Milan, Italy (2006)
- V.Grachev, G. Malovichko. Luminescence, optical absorption and magnetic resonance of transition and rare earth impurities in lithium niobate. 6th European Conference on Luminescence Detectors and Transformers of Ionizing Radiation (LUMDETR 2006), Lviv, Ukraine (2006).
- V.Grachev, G.Malovichko, O.Schirmer. Comparison of the EPR and ENDOR data of LiNbO3:Fe, LiTaO3:Fe and KTaO3:Fe. Photorefractive Workshop, Florida, USA (2003).