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@ARTICLE{Adam:865024,
author = {Adam, Roman and Chen, Genyu and Bürgler, Daniel E. and
Shou, Tianyu and Komissarov, Ivan and Heidtfeld, Sarah and
Hardtdegen, Hilde and Mikulics, Martin and Schneider, Claus
M. and Sobolewski, Roman},
title = {{M}agnetically and optically tunable terahertz radiation
from {T}a/{N}i{F}e/{P}t spintronic nanolayers generated by
femtosecond laser pulses},
journal = {Applied physics letters},
volume = {114},
number = {21},
issn = {1077-3118},
address = {Melville, NY},
publisher = {American Inst. of Physics},
reportid = {FZJ-2019-04589},
pages = {212405 -},
year = {2019},
abstract = {We generate terahertz (THz) transients by illuminating a
few-nanometer-thick Ta/NiFe/Pt nanolayers with a train of
linearly polarized 100-fs-wide laser pulses. The transients
are ∼1-ps-wide free-space propagating bursts of
electromagnetic radiations with amplitudes that are
magnetically and optically tunable. Their spectral frequency
content extends up to 5 THz, and the 3-dB cutoff is at
0.85 THz. The observed transient electromagnetic signals
originate from the NiFe/Pt bilayer, and their amplitude
dependence on the external magnetic field, applied in the
sample plane, very closely follows the static magnetization
versus magnetic field dependence of the NiFe film. For the
same laser power, excitation with highly energetic, blue
light generates THz transients with amplitudes approximately
three times larger than the ones resulting from excitation
by infrared light. In both cases, the transients exhibit the
same spectral characteristics and are linearly polarized in
the perpendicular direction to the sample magnetization. The
polarization direction can be tuned by rotation of the
magnetic field around the laser light propagation axis. The
characteristics of our THz spintronic emitter signals
confirm that THz transient generation is due to the inverse
spin Hall effect in the Pt layer and demonstrate that
ferromagnet/metal nanolayers excited by femtosecond laser
pulses can serve as efficient sources of magnetically and
optically tunable, polarized transient THz radiation.},
cin = {PGI-6 / ER-C-2},
ddc = {530},
cid = {I:(DE-Juel1)PGI-6-20110106 / I:(DE-Juel1)ER-C-2-20170209},
pnm = {522 - Controlling Spin-Based Phenomena (POF3-522) / 143 -
Controlling Configuration-Based Phenomena (POF3-143)},
pid = {G:(DE-HGF)POF3-522 / G:(DE-HGF)POF3-143},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000482438000037},
doi = {10.1063/1.5099201},
url = {https://juser.fz-juelich.de/record/865024},
}