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@ARTICLE{Faley:890422,
author = {Faley, Michael and Bikulov, Timur and Bosboom, Vincent and
Golubov, Alexander A and Dunin-Borkowski, Rafal E},
title = {{B}ulk nanomachining of cantilevers with {N}b nano{SQUID}s
based on nanobridge {J}osephson junctions},
journal = {Superconductor science and technology},
volume = {34},
number = {3},
issn = {1361-6668},
address = {Bristol},
publisher = {IOP Publ.},
reportid = {FZJ-2021-00942},
pages = {035014},
year = {2021},
abstract = {Nanometer-scale superconducting quantum interference
devices (nanoSQUIDs) were fabricated within a distance of 1
µm from the corners of 2 $ \times $ 2 $ \times $ 0.05 mm Si
cantilevers that are intended for use in a scanning
nanoSQUID microscope. The nanoSQUIDs contained Josephson
junctions (JJs) in the form of Nb-based nanobridges, which
had widths down to 10 nm and were patterned using hydrogen
silsesquioxane negative resist. Numerical simulations of the
superconducting current and the spatial distribution of the
order parameter in the nanobridge JJs and the nanoSQUID, as
well as the current–phase relationship in the nanobridge
JJs, were performed according to Ginzburg–Landau equations
on one-dimensional and two-dimensional grids. Bulk
micromachining of the Si cantilever was performed using
reactive ion etching with SF6 gas through masks of nLOF 2020
photoresist from the front side and a quartz shadow mask
from the back side of the substrate. An etch rate of 6
µmmin−1 for Si was achieved for a power of 300 W of the
inductively coupled SF6 plasma. The nanoSQUIDs exhibited
non-hysteretic current–voltage characteristics on the
cantilever. The estimated spin sensitivity of 48 µB
(√Hz)−1 is sufficient for use of such a nanoSQUID as a
magnetic field sensor for studying nanoscale objects, with a
projected total distance to the object of below 100 nm.},
cin = {PGI-5 / ER-C-1},
ddc = {530},
cid = {I:(DE-Juel1)PGI-5-20110106 / I:(DE-Juel1)ER-C-1-20170209},
pnm = {535 - Materials Information Discovery (POF4-535)},
pid = {G:(DE-HGF)POF4-535},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000614065000001},
doi = {10.1088/1361-6668/abda5c},
url = {https://juser.fz-juelich.de/record/890422},
}