Top spin valves of Ta/[NiFe/CoFe]/Cu/CoFe/(FeMn, MnIr)/Ta composition with two types of antiferromagnetic layers (Fe 50 Mn 50 or Mn 75 Ir 25 ) were prepared by DC magnetron sputtering. The three-step method for a free layer coercivity reduction has been used, namely, (i) deposition of a composite 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 spin valves studied can be effectively reduced to a few tenths of an Oersted keeping the magnetoresistance higher than 8%.
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Устинов et al. (2013) studied this question.
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