THz generation by exchange-coupled spintronic emitters

被引：0
|
作者：
Roman Adam [1 ]
Derang Cao [1 ]
Daniel E. Bürgler [2 ]
Sarah Heidtfeld [1 ]
Fangzhou Wang [1 ]
Christian Greb [3 ]
Jing Cheng [1 ]
Debamitra Chakraborty [3 ]
Ivan Komissarov [1 ]
Markus Büscher [3 ]
Martin Mikulics [4 ]
Hilde Hardtdegen [5 ]
Roman Sobolewski [4 ]
Claus M. Schneider [5 ]
机构：
[1] Research Centre Jülich,Peter Grünberg Institute
[2] Qingdao University,College of Physics
[3] University Duisburg-Essen,Faculty of Physics
[4] University of Rochester,Materials Science Graduate Program
[5] University of Rochester,Laboratory for Laser Energetics
[6] University of Rochester,Department of Electrical and Computer Engineering
[7] Heinrich-Heine Universität Düsseldorf,Institut für Laser
[8] Research Centre Jülich, und Plasmaphysik
来源：
npj Spintronics | / 2卷 / 1期
关键词：
D O I：
10.1038/s44306-024-00061-0
中图分类号：
学科分类号：
摘要：
The mechanism of THz generation in ferromagnet/metal (F/M) bilayers has been typically ascribed to the inverse spin Hall effect (ISHE). Here, we fabricated Pt/Fe/Cr/Fe/Pt multilayers containing two back-to-back spintronic THz emitters separated by a thin (tCr≤ 3nm) wedge-shaped Cr spacer. In such an arrangement, magnetization alignment of the two Fe films can be controlled by the interplay between Cr-mediated interlayer exchange coupling (IEC) and an external magnetic field. This in turn results in a strong variation of the THz amplitude A, with A↑↓ reaching up to 14 times A↑↑ (arrows indicate the relative alignment of the magnetization of the two magnetic layers). This observed functionality is ascribed to the interference of THz transients generated by two closely spaced THz emitters. Moreover, the magnetic field dependence A(H) shows a strong asymmetry that points to an additional performance modulation of the THz emitter via IEC and multilayer design.
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