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Mobility of magnetic helicoid in holmium nano-layer
R.S. Zavornitsyn,L.I. Naumova,M.A. Milyaev,M.V. Makarova,V.V. Proglyado,I.K. Maksimova,V.V. Ustinov 한국물리학회 2020 Current Applied Physics Vol.20 No.12
Spin valves with holmium layers and three-layer structures metal/Ho/metal were prepared by magnetron sputtering. A holmium layer in the spin valves is polycrystalline with weak axial <002> texture. The structural coherence length along the hexagonal c-axis is approximately 2/5 of the total thickness of the holmium layer. Field dependences of the spin valves magnetoresistance were measured at different temperatures. Correlation was revealed between magnetic state in holmium layer and the shape of magnetoresistive curve. Deviation of magnetic moments of the reference layer and the adjacent part of holmium from the applied magnetic field was investigated. The field induced mobility of the magnetic helicoid in holmium layers was revealed.
Timofeeva, M. N.,Prikhod’ko, S. A.,Makarova, K. N.,Malyshev, M. E.,Panchenko, V. N.,Ayupov, A. B.,Jhung, S. H. Springer Science and Business Media 2017 Reaction kinetics, mechanisms and catalysis Vol.121 No.2
<P>The cyclocondensation of 1,2-phenylenediamine (I) with acetone was investigated in the presence of Fe-containing microporous nickel phosphate molecular sieves (Fe-VSB-5) and Fe-containing mesoporous mesophase materials (Fe-MMM). The main product was 2,3-dihydro-2,2,4-trimethyl-1H-1,5-benzodiazepine (1,5-benzodiazepine) with 86-88% yield at 50 degrees C, with an acetone/(I) molar ratio of 2.5 in methanol as the reaction medium. The Fe content was found to affect not only the reaction rate but also yield of 1,5-benzodiazepine. The high reaction rate and yield of 1,5-benzodiazepine were-achieved with isolated iron sites in frameworks of Fe-VSB-5 and Fe-MMM.</P>