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".
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Programme(s)
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Coordinator
44780 Bochum
Germany
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