摘要：We report on the experimental and theoretical studies of cooling field ( H FC) and temperature ( T ) dependent exchange bias (EB) in Fe x Au1 − x /Fe19Ni81 spin glass (SG)/ferromagnet (FM) bilayers. When x varies from 8% to 14% in the Fe x Au1 − x SG alloys, with increasing T , a sign-changeable exchange bias field ( H E) together with a unimodal distribution of coercivity ( H C) are observed. Significantly, increasing in the magnitude of H FC reduces (increases) the value of H E in the negative (positive) region, resulting in the entire H E ∼ T curve to move leftwards and upwards. In the meanwhile, H FC variation has weak effects on H C. By Monte Carlo simulation using a SG/FM vector model, we are able to reproduce such H E dependences on T and H FC for the SG/FM system. Thus this work reveals that the SG/FM bilayer system containing intimately coupled interface, instead of a single SG layer, is responsible for the novel EB properties.
