Origin of training of EB Co/CoO

Training effect of the exchange bias in Co/CoO bilayers originates from the irreversible thermoremanent magnetization of the magnetically diluted antiferromagnet.
S. R. Ali, M. R. Ghadimi, M. Fecioru-Morariu, B. Beschoten, and G. Güntherodt
Phys. Rev. B 85, 012404 (2012)

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Exchange bias field |BEB| of
MgO(100)/Co1−yO(100)/Co(11¯20)/Au vs T for undiluted (circles)
and diluted (squares) samples. The inset shows RHEED patterns of
(a) the undiluted CoO layer and (b) the diluted Co1−yO layer grown
on an MgO(100) substrate.