The Effect of Pinholes on Magnetic Behaviour of Antiferromagnetically Coupled Ni-Fe/Cu Mulitlayers

  • Stobiecki, F (Institute of Molecular Physics, Polish Academy of Sciences, ul.) ;
  • Lucinski, T (Institute of Molecular Physics, Polish Academy of Sciences, ul.) ;
  • Dubowik, J (Institute of Molecular Physics, Polish Academy of Sciences, ul.) ;
  • Szymanski, B (Institute of Molecular Physics, Polish Academy of Sciences, ul.) ;
  • Urbaniak, M (Institute of Molecular Physics, Polish Academy of Sciences, ul.) ;
  • Castano, F.J (Institute of Applied Magnetism (IMA), Madrid, Spain) ;
  • Stobiecki, T (University of Mining and Metallutry, Electronics Department)
  • Published : 1998.09.01

Abstract

The magnetisation behaviour of polycrystalline permalloy/copper multilayers with mixed antiferromagnetic/ferromagnetic coupling was investigated as function of temperature. The results are discussed in a framework of a realistic model of anitferromagnetically coupled layers connected by ferromagnetic pinholes. A microstructure of pinholes (their density and dimensions) was varied either by a proper annealing treatment or by choosing samples with various Cu spacer thicknesses. It was demonstrated that the temperature changes of the net magnetic moment measured in a magnetic field smaller than the saturation field was strongly affected by the composition of the pinholes, their density, cross-sectional area and their lengths.

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References

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