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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%.
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.
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.