Journal
APPLIED PHYSICS LETTERS
Volume 114, Issue 4, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.5048297
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Funding
- EPSRC Centre for Doctoral Training in Metamaterials [EP/L015331/1]
- EPSRC fellowship [EP/K041215/1]
- German Research Foundation [SFB TRR 227, SFB TRR 173]
- Graduate School of Excellence Materials Science in Mainz (MAINZ) [GSC 266]
- ERC H2020 CoG project TERAMAG [681917]
- European Research Council (ERC) [681917] Funding Source: European Research Council (ERC)
- EPSRC [EP/K041215/1, EP/S036466/1, EP/F026757/1] Funding Source: UKRI
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We systematically study the pump-wavelength dependence of terahertz pulse generation in thin-film spintronic THz emitters composed of a ferromagnetic CoFeB layer between adjacent nonmagnetic W and Pt layers. We find that the efficiency of THz generation is essentially flat for excitation by 150 fs pulses with center wavelengths ranging from 900 to 1500 nm, demonstrating that the spin current does not depend strongly on the pump photon energy. We show that the inclusion of dielectric overlayers of TiO2 and SiO2, designed for a particular excitation wavelength, can enhance the terahertz emission by a factor of up to two in field. (C) 2019 Author(s).
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