Nonreciprocal Transport in a Rashba Ferromagnet, Delafossite PdCoO2
Nonreciprocal Transport in a Rashba Ferromagnet, Delafossite PdCoO2
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Rashba 铁磁体中的非互易输运，Delafossite PdCoO2
DOI：
10.1021/acs.nanolett.1c02756
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发表时间：
2021
期刊：
影响因子：
10.8
通讯作者：
Manuel Bibes
中科院分区：
文献类型：
--
作者：
Jin Hong Lee;Takayuki Harada;Felix Trier;Lourdes Marcano;Florian Godel;Sergio Valencia;Atsushi Tsukazaki;Manuel Bibes
Rashba接口产生有效的自旋-电荷相互转换，并引起非互易输运现象。在这里，我们报告几个纳米厚的PdCoO 2，铜铁矿氧化物显示一个大的Rashba分裂和表面铁磁性膜的磁输运实验。通过分析的角度依赖性的第一和第二谐波的纵向和横向磁电阻率，我们确定了一个Rashba驱动的单向磁电阻，竞争的反常能斯特效应低于居里点。我们估计Rashba系数为0.75 ± 0.3 eV，并认为我们的研究结果使铜铁矿成为纳米自旋电子学和自旋轨道电子学的一个新的氧化物家族，超越了钙钛矿材料。
Rashba interfaces yield efficient spin-charge interconversion and give rise to nonreciprocal transport phenomena. Here, we report magnetotransport experiments in few-nanometer-thick films of PdCoO2, a delafossite oxide known to display a large Rashba splitting and surface ferromagnetism. By analyzing the angle dependence of the first- and second-harmonic longitudinal and transverse resistivities, we identify a Rashba-driven unidirectional magnetoresistance that competes with the anomalous Nernst effect below the Curie point. We estimate a Rashba coefficient of 0.75 ± 0.3 eV Å and argue that our results qualify delafossites as a new family of oxides for nanospintronics and spin–orbitronics, beyond perovskite materials.