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

Abstract

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

Accepted for publication in Applied Physics Letters

References in corpus (3)

• Exchange bias effect in alloys and compounds
• Observation of spin glass state in weakly ferromagnetic Sr${}_2$FeCoO${}_6$ double perovskite
• Intrinsic exchange bias in Zn${}_x$Mn${}_{3-x}$O${}_4$ ($x\le 1$) solid solutions

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