  The exchange-bias training effect in IrMn-layer/ferromagnetic-ribbon
heterostructure is studied by performing magnetoimpedance (MI) measurements.
Asymmetric, hysteretic and single peak behavior of the MI response and a shift
in the MI peak to zero fields accompanied by 52% increase in MI has been
detected as the signature of the exchange bias (EB) and training effect (TE),
respectively. Also, during the consecutive filed sweep of MI response, both EB
field and the degree of asymmetry of MI decrease that is another reason for
existence of TE in our sample. The analysis of the magneto-optical Kerr effect
(MOKE) and MI behavior establish that Hoffmann s model (Phys. Rev. Lett. 93,
097203 (2004)) is a good description of our experimental data, due to the
existence of a strong single cycle TE in our IrMn-layer/ferromagnetic-ribbon
system.
