Journal
APPLIED PHYSICS LETTERS
Volume 110, Issue 25, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4986755
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Funding
- European Research Council [681917]
- German Research Foundation [KA 3305/2-1, SFB TRR173/Spin_X]
- European Community [608031]
- Graduate School of Excellence Materials Science in Mainz (MAINZ) [GSC 266]
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We explore the capabilities of metallic spintronic thin-film stacks as a source of intense and broadband terahertz electromagnetic fields. For this purpose, we excite a W/CoFeB/Pt trilayer (thickness of 5.6 nm) on a large-area glass substrate (diameter of 7.5 cm) by a femtosecond laser pulse (energy 5.5 mJ, duration 40 fs, and wavelength 800 nm). After focusing, the emitted terahertz pulse is measured to have a duration of 230 fs, a peak field of 300 kV cm(-1), and an energy of 5 nJ. In particular, the waveform exhibits a gapless spectrum extending from 1 to 10 THz at 10% of its amplitude maximum, thereby facilitating nonlinear control over matter in this difficult-to-reach frequency range on the sub-picosecond time scale. Published by AIP Publishing.
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