标题： 可调交换偏置在Y$_3$Fe$_5$O$_{12}$薄膜在Gd$_3$Ga$_5$O$_{12}$上 显示英文标题

标题： Tunable exchange bias in Y$_3$Fe$_5$O$_{12}$ film on Gd$_3$Ga$_5$O$_{12}$

摘要： 铁磁性 Y$_3$Fe$_5$O$_{12}$在顺磁性 Gd$_3$Ga$_5$O$_{12}$的 (001) 表面生长时会经历交换偏置场，这被归因于两种材料之间的界面层的磁性。 我们在这里报告，当使用溅射生长且退火温度比以前的工作更低时，界面磁层的阻塞温度降低到约 7 K，同时仍然表现出强烈的交换偏置。 然后发现通过仔细改变场冷却程序，这种交换偏置可以在其两个极端值之间调节。 这是由于当界面层被加热到其阻塞（或熔化）温度附近时，界面层的自旋具有缓慢而复杂的动力学行为，这类似于自旋玻璃。 显示英文摘要

摘要： Ferrimagnetic Y$_3$Fe$_5$O$_{12}$ grown on the (001) surface of paramagnetic Gd$_3$Ga$_5$O$_{12}$ experiences an exchange bias field, which has been attributed to the magnetism of an interface layer between the two materials. We report here that when grown using sputtering and with lower post-annealing temperatures than in previous works, the blocking temperature of the interface magnetic layer is lowered to about 7 K, while still displaying a strong exchange bias. This exchange bias is then found to be tunable between its two extreme values by carefully varying the field cooling protocol. This is attributed to a slow and complex dynamics of the spins of the interface-layer when it is warmed up close to its blocking (or melting) temperature, which is reminiscent of a spin glass.