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We report here sign reversal and tunability of exchange bias in AuFecosputtered films of thickness about 63 nm. As deposited film exhibits exchangebias effect at room temperature without external triggering field and itsmagnitude increases gradually with decrease in temperature down to 5 K. Uponirradiation with 100 MeV Au9+ ions at a fluence of 5*1013 ions/cm2, hysteresisloop shifts completely from origin towards positive field side at roomtemperature and reverses sign when temperature is reduced to 5 K as studied bySQUID magnetometry. A well defined uniaxial magnetic anisotropy has been seenby magneto optical Kerr effect (MOKE) in as deposited film as well as inirradiated one. The results are explained on the basis of stress inducedmagnetic anisotropy in thin films.

Sign Reversal and Tunability of Exchange Bias in Nanoscale AuFe Alloy Film: A New Material for Spintronic Application