Impact of pump wavelength on terahertz emission of a cavity-enhanced spintronic trilayer

Herapath RI, Hornett SM, Seifert TS, Jakob G, Klaeui M, Bertolotti J, Kampfrath T, Hendry E (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Applied Physics Letters American Institute of Physics (AIP)

Book Volume: 114

Article Number: 041107

Journal Issue: 4

DOI: 10.1063/1.5048297

Abstract

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 TiO 2 and SiO 2 , designed for a particular excitation wavelength, can enhance the terahertz emission by a factor of up to two in field.

Involved external institutions

University of Exeter GB United Kingdom (GB) Fritz-Haber-Institut der Max-Planck-Gesellschaft (FHI) DE Germany (DE) Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE)

How to cite

APA:

Herapath, R.I., Hornett, S.M., Seifert, T.S., Jakob, G., Klaeui, M., Bertolotti, J.,... Hendry, E. (2019). Impact of pump wavelength on terahertz emission of a cavity-enhanced spintronic trilayer. Applied Physics Letters, 114(4). https://doi.org/10.1063/1.5048297

MLA:

Herapath, R. I., et al. "Impact of pump wavelength on terahertz emission of a cavity-enhanced spintronic trilayer." Applied Physics Letters 114.4 (2019).

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