Objective The aim of the project is the investigation of the fundamental nature of low-dimensional magnetism using metallic multilayers with reversibly tunable (via hydrogen loading) interlayer exchange interaction. These systems present a new class of structures where continues transition from quasi-two-dimensional to three-dimensional magnetism can be realised experimentally.We will grow Fe(Cr)/V superlattices of high epitaxial quality by magnetron sputtering and MBE techniques. Being placed into the hydrogen atmosphere, these systems accumulate hydrogen in the V spacer, increasing the V-lattice constant up to 10% in the direction perpendicular to the multilayer plane. Magnetic blocks (Fe or Cr) do not accept H and their spatial structure remains unchanged. As a result, interlayer exchange coupling between magnetic layers can be changed in Fe/V structures from ferromagnetic to antiferromagnetic and vice versa. Tuning of H concentration, which can be achieved by a slight variation of the external hydrogen pressure, leads to a continuous transition from quasi-two-dimensional to three-dimensional magnetic structure. This transition, including critical behaviour near the Curie point, will be studied using complimentary experimental methods (Polarised Neutron Reflectometry (PNR), MOKE, EXAFS, Anomalous Wide Angle X-ray Scattering (AWAXS), Resonant X-ray Magnetic Scattering, Mössbauer Spectroscopy, Magnetometer and Magneto-resistance and High frequency electromagnetic measurements). The magnetic and chemical structure of the interface, its dependence on the regimes of the epitaxial growth and annealing will be additionally studied in situ by Spin Polarised Secondary Electron Emission (SPSEE), Spin Polarised Auger Electron Spectroscopy (SPAES), and by Scanning Tunnelling Spectroscopy with atomic resolution.The theoretical description will include modelling of the epitaxial growth and hydrogenation process with subsequent self-consistent calculations of magnetic structure on the basis of ab initio (TB LMTO, FP LMTO, FP LAPW) and model Hamiltonian approaches. Ab initio methods will be used for calculations of the set of model structures and fitting of the parameters of semi-empirical models, whereas model Hamiltonian calculations will be performed for systems, which include several thousands of non-equivalent atoms for realistic modelling of interface roughness and alloying. After taking a corresponding average it will allow to interpret the data of different experimental methods within the framework of one theoretical approach.Detailed quantitative information about magnetic and chemical structures on the atomic scale and its evolution with hydrogen loading obtained using consistent experimental and theoretical studies will reveal new fundamental information on the Spin Density Wave material (Cr) and Ferromagnetic material (Fe) under conditions of continuous "reduction of dimensionality". Programme(s) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Topic(s) 1B - Condensed Matter, Optics and Plasma Physics OPEN - OPEN Call Call for proposal Data not available Funding Scheme Data not available Coordinator Ruhr Universität Bochum EU contribution No data Address Universitätsstr. 150 44780 Bochum Germany See on map Total cost No data Participants (10) Sort alphabetically Sort by EU Contribution Expand all Collapse all Centre National de la Recherche Scientifique France EU contribution No data Address 23, rue du Loess 67037 Strasbourg See on map Total cost No data Gerhard-Mercator-Universität Duisburg Germany EU contribution No data Address Lotharstr. 65 47048 Duisburg See on map Total cost No data Heinrich-Heine-Universität Düsseldorf Germany EU contribution No data Address Universitätsstr.1 40225 Düsseldorf See on map Total cost No data JOHANNES GUTENBERG UNIVERSITAET MAINZ Germany EU contribution No data Address Fritz-Strassmann-Weg 2 55128 MAINZ See on map Total cost No data Joint Institute for Nuclear Research Russia EU contribution No data Address Jolio Curie,6 141980 Dubna, Moscow Region See on map Total cost No data St. Petersburg State Technical University Russia EU contribution No data Address Polytechnicheskaya st. 29 195251 St. Petersburg See on map Total cost No data St.Petersburg State University Russia EU contribution No data Address 14 linia VO, 29 199178 St. Petersburg See on map Total cost No data Uppsala University Sweden EU contribution No data Address 751 21 Uppsala See on map Total cost No data Ural Branch of the Russian Academy of Sciences Russia EU contribution No data Address Kirov 426001 Izhevsk See on map Total cost No data Ural Branch of the Russian Academy of Sciences Russia EU contribution No data Address S.Kovalevskaya Street 18 620219 Ekaterinburg See on map Total cost No data
