4 $f$反铁磁体巨磁响应界面自旋的产生和操纵
Creating and manipulating interfacial spin with giant magnetic response in 4$f$ antiferromagnets
摘要：
在低维电子系统（如二维电子气）中产生和操纵自旋极化对于自旋电子学应用是至关重要的，迄今为止这仍然是一个挑战。本文建立了4-$f$反铁磁TbScO $_3$的变磁相图，揭示了其对亚特斯拉磁场的巨磁响应，这是迄今未见报道的。利用这种巨磁响应，我们证明了在界面3 \textit{d} -4 \textit{f}交换作用的帮助下，SrTiO $_3$ /LaTiO $_3$ /TbScO $_3$异质结构中二维电子气的自旋极化可以被成功地操纵.值得注意的是，在SrTiO $_3$ /LaTiO $_3$界面的二维电子气的滞后磁阻完全由下面的TbScO $_3$衬底的变磁相变决定。我们的研究结果为设计4 $f$反铁磁异质结中低维电子系统的自旋极化提供了一条新的途径。
英文摘要：
Creating and manipulating spin polarization in low-dimensional electron systems (such as two-dimensional electron gases) is fundamentally essential for spintronic applications, which is yet a challenge to date. In this work, we establish the metamagnetic phase diagram of 4$f$ antiferromagnetic TbScO$_3$ and reveal its giant magnetic response to sub-tesla magnetic field, which has not been reported thus far. Utilizing this giant magnetic response, we demonstrate that the spin polarization of two-dimensional electron gas in SrTiO$_3$/LaTiO$_3$/TbScO$_3$ heterostructure can be manipulated successfully in aid of interfacial 3\textit{d}-4\textit{f} exchange interaction. Remarkably, the hysteretic magnetoresistances of two-dimensional electron gas at the SrTiO$_3$/LaTiO$_3$ interface are entirely determined by the metamagnetic phase transitions of the underlying TbScO$_3$ substrate. Our results pave a novel route to engineer the spin polarization of low-dimensional electron systems in 4$f$ antiferromagnet-based heterostructures.
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