Enhanced magnetoresistance in layered magnetic structures with antiferromagnetic interlayer exchange

A very interesting case which we found during the course of this work was double layers of Fe interspaced by

G. Binasch

2002

Scholarcy highlights

  • The eA'ect is much stronger than the usual anisotropic magnetoresistance and further increases in structures with more than two Fe layers
  • The microscopic origin of this AF coupling up to now remains somewhat unclear, we found that such structures display some novel and unique magnetic properties both in their static and dynamic behavior. ' The new feature we report on here and which comes as a result of the AF coupling is a strong increase of the magnetoresistance effect
  • In layered structures with AF coupling a change in resistivity due to antiparallel alignment of the magnetizations in the ferromagnetic films can be observed
  • Waves with positive and negative k~~ are not linked by symmetry and occur at different frequencies. This is sometimes referred to as nonreciprocal behavior. We see that for the two directions of the field scan the asymmetry reverses. This is linked with the fact that the magnetizations in the single films are reversed correspondingly, supporting the information already obtained from the magneto-optic Kerr effect intensities
  • The experimental results reported here show that the antiparallel alignment of the magnetizations in our double layers produces an appreciable increase of the electrical resistivity
  • We have tested the possibility of a further increase of the effect by fabricating layered structures with more than two Fe films

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