研究目的
Investigating terahertz emission from exchange-coupled synthetic antiferromagnets (SAFs) based on the anomalous Hall effect (AHE) and the inverse spin Hall effect (ISHE), and utilizing terahertz emission as a tool to probe magnetization reversal processes in SAF structures.
研究成果
The study demonstrates that terahertz emission from SAF structures can be significantly enhanced by antiparallel alignment of ferromagnetic layers and serves as a powerful tool to probe magnetization reversal processes. The terahertz emission's dependence on the vector difference of magnetizations provides unique insights not obtainable through standard magnetometry.
研究不足
The study is limited by the inability to probe the vertical component of magnetization and the assumption of negligible contribution from the Ru layer in the SAF structures. Additionally, the laser-heating effect on the samples is not fully quantified.
1：Experimental Design and Method Selection:
The study involves the use of femtosecond laser irradiation on SAF structures to generate terahertz emission. The mechanisms of AHE and ISHE are employed for terahertz generation in different SAF structures.
2：Sample Selection and Data Sources:
Samples include Fe-Mn-Pt/Ru/Fe-Mn-Pt and Pt/Co-Fe-B/Ru/Co-Fe-B/Pt SAF structures, with control samples of single-layer Fe-Mn-Pt and Co-Fe-B/Pt bilayer emitters.
3：List of Experimental Equipment and Materials:
A femtosecond Ti:sapphire laser, electro-optical sampling system with a ZnTe detector, and a Quantum Design VersaLab system for magnetometry measurements.
4：Experimental Procedures and Operational Workflow:
Terahertz emission is measured under varying magnetic fields and laser fluences. The magnetization reversal processes are probed by analyzing the terahertz emission's dependence on the external magnetic field.
5：Data Analysis Methods:
The terahertz emission's dependence on the magnetic field is analyzed to understand the magnetization reversal processes in SAF structures.
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