Perpendicular exchange bias mechanism in FePt/FeMn multilayers

摘要

A systematic study of parallel and perpendicular exchange biases in FePt/FeMn multilayers fabricated onto MgO(001) substrates by ion beam sputter deposition system was conducted. The blocking temperature of parallel exchange bias was found to be higher than that of the perpendicular one. The discrepancy was interpreted as due to the spin canting out of plane at the interface. A systematic simulation based on the Landau-Lifshitz-Gilbert equation was carried out, which was, in reasonable agreement with the assumption of spin canting out of plane, suggesting the state of nonuniform distribution of spin direction at the interface.