Spin-valve effects in point contacts to exchange biased Co40Fe40B20   films
  Nonlinear current-voltage characteristics and magnetoresistance of point contacts between a normal metal (N) and films of amorphous ferromagnet (F) Co40Fe40B20 of different thickness, exchange-biased by antiferromagnetic Mn80Ir20 are studied. A surface spin valve effect in the conductance of such F-N contacts is observed. The effect of exchange bias is found to be inversely proportional to the Co40Fe40B20 film thickness. This behavior as well as other magneto-transport effects we observe on single exchange-pinned ferromagnetic films are similar in nature to those found in conventional three-layer spin-valves. 
O. P. Balkashin, V. V. Fisun, L. Yu. Triputen, S. Andersson, V.   Korenivski, Yu. G. Naidyuk
cond-mat.mes-hall cond-mat.mtrl-sci