Anomalous Hall effect in Pt/La0.67Sr0.33MnO3 heterojunctions
Anomalous Hall effect in Pt/La0.67Sr0.33MnO3 heterojunctions
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DOI：
10.7498/aps.72.20221852
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发表时间：
2023
影响因子：
1
通讯作者：
Hu Shi-Lin;Liu Jun-Hua;Deng Zhi-Xiong;Xiao Wen;Yang Zhan;Chen Kai;Liao Zhao-Liang
中科院分区：
文献类型：
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作者：
Hu Shi-Lin;Liu Jun-Hua;Deng Zhi-Xiong;Xiao Wen;Yang Zhan;Chen Kai;Liao Zhao-Liang
许多新出现的新现象发生在非磁性/铁磁体异质结构中。特别是，Pt/铁磁体异质结构最近引起了人们的极大关注，其中Pt具有强自旋轨道耦合，因此可以将自旋电流转化为充电电流。在许多 Pt/铁磁体异质结构中都发现了反常霍尔效应 (AHE)。然而，底层物理仍然难以捉摸，因此有必要寻找更多的异质结构以提供更多的实验基础。在本文中，我们报告了外延 La0.67Sr0.33MnO3 (LSMO) 铁磁薄膜上溅射的 Pt 薄膜中反常霍尔电阻 (AHR) 的研究。通过脉冲激光沉积和射频磁控溅射制备了高质量的 Pt/LSMO 异质结。 LSMO 薄膜的物理性质通过磁性和传输性质的测量来表征。 Pt/LSMO异质结中的AHR主要由Pt贡献，随着温度的降低急剧增加，并在40 K以下改变其符号。此外，随着Pt厚度的增加，AHR急剧减小。事实表明，由于磁邻近效应，Pt 的铁磁性源于界面。有趣的是，这种异质结可以在低外加磁场下表现出拓扑霍尔效应的可能信号。上述结果为进一步理解非磁/铁磁异质结构中电子自旋和电荷传输耦合提供了实验基础。
Many emergent and novel phenomena occur in nonmagnetic/ferromagnet heterostructures. In particular, Pt/ferromagnet heterostructures where the Pt has strong spin-orbit coupling and thus can convert spin current into charge current has attracted a great attention recently. The anomalous Hall effect (AHE) have been found in many Pt/ferromagnet heterostructures. However, the underline physics remains elusive, so it is necessary to find more heterostructure in order to provide more experimental basis. In this paper, we report an investigation of anomalous Hall resistance (AHR) in Pt thin films sputtered on epitaxial La0.67Sr0.33MnO3 (LSMO) ferromagnetic films. High-quality Pt/LSMO heterojunctions were fabricated by pulsed laser deposition and RF-magnetron sputtering. The physical properties of LSMO films were characterized by the measurements of magnetic and transport properties. The AHR mainly contributed by Pt in the Pt/LSMO heterojunction increases sharply with decreasing temperature and changes its sign below 40 K. Furthermore, the AHR decreases sharply with increasing Pt thickness. There facts suggest that the ferromagnetism of Pt originates from interface due to magnetic proximity effect. Interestingly, this heterojunction can exhibit possible signal of topological Hall effect under low applied magnetic field. The above results provide an experimental basis for further understanding of electron spin and charge transport coupling in nonmagnetic/ferromagnetic heterostructures.