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Top Non-collinear Spin Valves with a Composite Free Layer for Hysteresis-free GMR Sensors
V. V. Ustinov,M. A. Milyaev,L. I. Naumova,T. P. Krinitsina,V. V. Proglyado,E. I. Patrakov 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Top spin valves of Ta/[NiFe/CoFe]/Cu/CoFe/(FeMn, MnIr)/Ta composition with two types ofantiferromagnetic layers (Fe50Mn50 or Mn75Ir25) were prepared by DC magnetron sputtering. Thethree-step method for a free layer coercivity reduction has been used, namely, (i) deposition of acomposite free layer NiFe/CoFe, (ii) optimization of magnetic and nonmagnetic layer thicknesses and(iii) application of a “nearly parallel” anisotropy configuration. It is shown that the coercivity in spinvalves studied can be effectively reduced to a few tenths of an Oersted keeping the magnetoresistancehigher than 8%.
Lee, K.,Kinnunen, M.,Danilina, A.V.,Ustinov, V.D.,Shin, S.,Meglinski, I.,Priezzhev, A.V. Pergamon Press ; Elsevier Science Ltd 2016 Journal of biomechanics Vol.49 No.7
The aggregation of red blood cells (RBC) is an intrinsic feature of blood that has a strong impact on its microcirculation. For a number of years it has been attracting a great attention in basic research and clinical studies. Here, we study a relationship between the RBC aggregation parameters measured at the individual cell level and in a whole blood sample. The home made optical tweezers were used to measure the aggregating and disaggregating forces for a pair of interacting RBCs, at the individual cell level, in order to evaluate the corresponding shear stresses. The RheoScan aggregometer was used for the measurements of critical shear stress (CSS) in whole blood samples. The correlation between CSS and the shear stress required to stop an RBC pair from aggregating was found. The shear stress required to disaggregate a pair of RBCs using the double channel optical tweezers appeared to be about 10 times higher than CSS. The correlation between shear stresses required to prevent RBCs from aggregation at the individual cell level and in whole blood samples was estimated and assessed quantitatively. The experimental approach developed has a high potential for advancing hemorheological studies.
이해연,김현식,김종령,오영우,김은수,Ustinov Evgeniy 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.5
The forward planar transformer, which had power capacity of 300 W, input voltage of 220 V, output voltage of 15 V, and switching frequency of 300 KHz, was designed and manufactured by using the planar core with large effective area and the flat copper leadframes for miniaturization and high efficiency of the switching mode power supply (SMPS). As well as, a forward converter equipped with the above mentioned planar transformer was manufactured and electromagnetic characteristics were investigated. The numerical value of turns for 1st and 2nd winding were 15 and 2 respectively The self inductance of 1st winding was 1.592 mH, very low leakage inductance of 2.7 $\mu$H, and the coupling factor of 0.928 were obtained at switching frequency of 300 KHz. The high efficiency of 88.62 % for the SMPS equipped with planar transformer was obtained at power capacity of 300 W.
L.I. Naumova,M.A. Milyaev,R.S. Zavornitsy,T.P. Krinitsina,V.V. Proglyado,V.V. Ustinov 한국물리학회 2019 Current Applied Physics Vol.19 No.11
Spin valves with nanostructure CoFe/Dy/CoFe and three-layer structures metal/Dy/metal were prepared by magnetron sputtering. The measurements of field dependences of magnetoresistance and magnetization were held at different temperatures. The changes of magnetotransport properties of spin valve containing CoFe/Dy/ CoFe structure were used for getting information on the magnetic ordering in the dysprosium layer. The characteristic changes of magnetotransport properties caused by the formation of helical ordering in dysprosium layer were detected. Special attention was paid to the estimation of Neel temperature and to the investigation of microstructure of dysprosium nanolayer.
Sergey V. Gnedenkov,Denis P. Opra,Sergey L. Sinebryukhov,Alexander K. Tsvetnikov,Alexander Y. Ustinov,Valentin I. Sergienko 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Electrochemical energy production has been extensively used in large scale applications. At present,organic compounds are considered as efficient and environmentally friendly electrode materials. Thepaper describes the study of the possibility of using hydrolysis lignin as the lithium battery cathodematerial. Hydrolysis lignin features have been investigated by the impedance spectroscopy, scanningelectron microscopy, and energy-dispersive X-ray spectroscopy. The discharge performance ofhydrolysis lignin-based lithium battery was investigated at room temperature using 1 M LiBF4 in gbutyrolactonelectrolyte system. It was found that the specific capacity of hydrolysis lignin was equal to450 mAh g1 at a discharge current density of 25 mA/cm2. Two main voltage plateaus located at ~1.8 and~1.1 V were observed. The chemical composition of cathode materials upon battery discharge down to0.9 V was studied by the X-ray photoelectron spectroscopy and infrared spectroscopy. The suggestionson possible electrochemical reactions occurring in the lithium/hydrolysis lignin system were made onthe basis of the products composition analysis. The results demonstrate the potential of hydrolysis ligninbased batteries to be used as low-rate power sources.
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.