研究目的
Investigating the impact of an external DC electric field on the performance of antenna-coupled spintronic THz emitters.
研究成果
The application of an external in-plane DC electric field to a layered spintronic emitter causes a quadratic decrease in the emitted THz field strength, consistent with a heat-induced reduction of the sample magnetization.
研究不足
The measurements were limited to a maximum voltage of 4.5V to avoid irreversible damage to the device. The study attributes the decrease in THz signal to Joule heating, but other factors influencing the spintronic process under an external electric field were not explored.
1：Experimental Design and Method Selection:
The study involves applying an external DC electric field to antenna-coupled spintronic THz emitters and measuring the effect on the emitted THz signal.
2：Sample Selection and Data Sources:
The spintronic material consists of a metallic trilayer Pt(2nm)|Co40Fe40B20(
3：8nm)|W(2nm) deposited on a Si(280μm)|SiOx(3μm) wafer. List of Experimental Equipment and Materials:
A 200μm H-dipole antenna with a 10μm gap, a 1550 nm laser system with a pulse duration of 90 fs, and an ErAs:InGaAs photoconductor with a 25μm H-dipole antenna and a 5μm gap as receiver.
4：Experimental Procedures and Operational Workflow:
The device was mounted on a silicon lens, and the DC bias was applied in-plane. The THz time domain system was set up to measure the emission spectra.
5：Data Analysis Methods:
The data was analyzed to observe the quadratic decrease in the peak-peak THz pulse amplitude with the increase in bias voltage.
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