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We report on the observation of exchange bias and memory effect in doubleperovskite Sr$_2$FeCoO$_6$. Antiphase boundaries between the ferromagnetic andantiferromagnetic regions in the disordered glassy phase is assumed asresponsible for the observed effect which reflects in the cooling fielddependence and temperature evolution of exchange bias field and in trainingeffect. The spin glass phase itself is characterized through memory, ageing andmagnetic relaxation experiments. The spin glass transition temperature, $T_g$,versus $H_{dc}^{2/3}$ follows the Almeida-Thouless line yielding a freezingtemperature, $T_f$ = 73 K. Time-dependent magnetic relaxation studies revealthe magnetization dynamics of the underlying glassy phase in this doubleperovskite.

Exchange bias and memory effect in Sr$_2$FeCoO$_6$