Cel 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". Program(-y) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Temat(-y) 1B - Condensed Matter, Optics and Plasma Physics OPEN - OPEN Call Zaproszenie do składania wniosków Data not available System finansowania Data not available Koordynator Ruhr Universität Bochum Wkład UE Brak danych Adres Universitätsstr. 150 44780 Bochum Niemcy Zobacz na mapie Koszt całkowity Brak danych Uczestnicy (10) Sortuj alfabetycznie Sortuj według wkładu UE Rozwiń wszystko Zwiń wszystko Centre National de la Recherche Scientifique Francja Wkład UE Brak danych Adres 23, rue du Loess 67037 Strasbourg Zobacz na mapie Koszt całkowity Brak danych Gerhard-Mercator-Universität Duisburg Niemcy Wkład UE Brak danych Adres Lotharstr. 65 47048 Duisburg Zobacz na mapie Koszt całkowity Brak danych Heinrich-Heine-Universität Düsseldorf Niemcy Wkład UE Brak danych Adres Universitätsstr.1 40225 Düsseldorf Zobacz na mapie Koszt całkowity Brak danych JOHANNES GUTENBERG UNIVERSITAET MAINZ Niemcy Wkład UE Brak danych Adres Fritz-Strassmann-Weg 2 55128 MAINZ Zobacz na mapie Koszt całkowity Brak danych Joint Institute for Nuclear Research Rosja Wkład UE Brak danych Adres Jolio Curie,6 141980 Dubna, Moscow Region Zobacz na mapie Koszt całkowity Brak danych St. Petersburg State Technical University Rosja Wkład UE Brak danych Adres Polytechnicheskaya st. 29 195251 St. Petersburg Zobacz na mapie Koszt całkowity Brak danych St.Petersburg State University Rosja Wkład UE Brak danych Adres 14 linia VO, 29 199178 St. Petersburg Zobacz na mapie Koszt całkowity Brak danych Uppsala University Szwecja Wkład UE Brak danych Adres 751 21 Uppsala Zobacz na mapie Koszt całkowity Brak danych Ural Branch of the Russian Academy of Sciences Rosja Wkład UE Brak danych Adres Kirov 426001 Izhevsk Zobacz na mapie Koszt całkowity Brak danych Ural Branch of the Russian Academy of Sciences Rosja Wkład UE Brak danych Adres S.Kovalevskaya Street 18 620219 Ekaterinburg Zobacz na mapie Koszt całkowity Brak danych
