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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.
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%.