Impact of various spintronic antenna structures driven by a 795 nm pump beam to terahertz (THz) wave generation. (1st December 2022)

• Record Type: Journal Article
• Authors: Talara, Miezel; Bulgarevich, Dmitry S.; Kobayashi, Kana; Kitahara, Hideaki; Furuya, Takashi; Escaño, Mary Clare; Watanabe, Makoto; Tani, Masahiko
• Is Part Of: Applied physics express. Volume 15:Number 12(2022)
• Publication Date: 2022-12-01
• Subjects: spintronic antenna -- spintronic THz emitter -- THz wave generation -- THz wave sources; Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.35848/1882-0786/ac99b5
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: We compare THz emission properties of rectangular, circular, and diabolo spintronic antennas composed of 2 nm Fe and 3 nm Pt layers on MgO substrates. Although the rectangular antenna generated the highest amplitude (∼1.8× improvement), the radiation spectra showed no significant difference. To fully check the effect of antennas, we fabricated diabolo and rectangular antennas with 200 nm Pt layer at the displacement current direction. We observed a 4.2× amplitude improvement using the rectangular antenna and a shift in the bandwidth as well as the peak frequency. These results suggest that spintronic antennas can be designed to be well-suited for specific applications.