Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China.
Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China.
Science. 2017 Jul 14;357(6347):191-194. doi: 10.1126/science.aak9717.
Synthesizing antiferromagnets with correlated oxides has been challenging, owing partly to the markedly degraded ferromagnetism of the magnetic layer at nanoscale thicknesses. Here we report on the engineering of an antiferromagnetic interlayer exchange coupling (AF-IEC) between ultrathin but ferromagnetic LaCaMnO layers across an insulating CaRuTiO spacer. The layer-resolved magnetic switching leads to sharp steplike hysteresis loops with magnetization plateaus depending on the repetition number of the stacking bilayers. The magnetization configurations can be switched at moderate fields of hundreds of oersted. Moreover, the AF-IEC can also be realized with an alternative magnetic layer of LaSrMnO that possesses a Curie temperature near room temperature. The findings will add functionalities to devices with correlated-oxide interfaces.
合成具有关联氧化物的反铁磁体一直具有挑战性，部分原因是在纳米尺度厚度下磁性层的铁磁性明显降低。在这里，我们报告了在绝缘 CaRuTiO 间隔层中，通过超薄但铁磁 LaCaMnO 层之间的工程设计实现反铁磁层间交换耦合（AF-IEC）。层分辨磁开关导致具有磁平台的急剧阶跃磁滞回线，其取决于堆叠双层的重复数量。磁化配置可以在数百奥斯特的中等磁场下切换。此外，反铁磁层间交换耦合也可以通过具有居里温度接近室温的 LaSrMnO 的替代磁性层来实现。这些发现将为具有关联氧化物界面的器件增加功能。
