Laser induced THz emission from femtosecond photocurrents in Co/ZnO/Pt and Co/Cu/Pt multilayers

被引：43

作者：

Li, G. ^{[1
]}

Mikhaylovskiy, R. V. ^{[1
]}

Grishunin, K. A. ^{[2
]}

Costa, J. D. ^{[3
]}

Rasing, Th ^{[1
]}

Kimel, A. V. ^{[1
,2
]}

机构：

[1] Radboud Univ Nijmegen, Inst Mol & Mat, Heyendaalseweg 135, NL-6525 AJ Nijmegen, Netherlands

[2] Moscow Technol Univ MIREA, Vernadsky Ave 78, Moscow 119454, Russia

[3] Int Iberian Nanotechnol Lab INL, Braga, Portugal

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2018年 / 51卷 / 13期

基金：

欧洲研究理事会; 俄罗斯科学基金会;

关键词：

ultrafast spintronics; THz spectroscopy; spin transport; spin-orbit coupling; spin-Hall effect;

D O I：

10.1088/1361-6463/aaab8f

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The ultrashort laser excitation of Co/Pt magnetic heterostructures can effectively generate spin and charge currents at the interfaces between magnetic and nonmagnetic layers. The direction of these photocurrents can be controlled by the helicity of the circularly polarized laser light and an external magnetic field. Here, we employ THz time-domain spectroscopy to investigate further the role of interfaces in these photo-galvanic phenomena. In particular, the effects of either Cu or ZnO interlayers on the photocurrents in Co/X/Pt (X = Cu, ZnO) have been studied by varying the thickness of the interlayers up to 5 nm. The results are discussed in terms of spin-diffusion phenomena and interfacial spin-orbit torque.

引用

页数：8

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