Ni/Pt spintronic emitters as potential reliable THz source
This work presents an evaluation of the capabilities of Ni/Pt spintronic emitter as terahertz (THz) emitters for possible future applications. The Ni/Pt structure is grown on a MgO substrate using an electron beam deposition facility. The THz emission from the spintronic Ni/Pt emitter is obtained by utilizing a THz time-domain spectroscopy system. The results are evaluated by comparing to the THz emission from known sources such as p-InAs and commercial butterfly photoconductive antenna. The Ni/Pt emitter has THz signal amplitude 2-3 orders of magnitude smaller compared to the other two THz sources. The detected bandwidth, however, is larger with a value of ~2.08 THz. The frequency at peak amplitude is also larger for the Ni/Pt emitter at 0.893 THz.