TY - JOUR
T1 - Josephson Junctions with Artificial Superparamagnetic Barrier
T2 - A Promising Avenue for Nanoscale Magnetometry
AU - Nevirkovets, Ivan P.
AU - Belogolovskii, Mikhail A.
AU - Ketterson, John B.
N1 - Funding Information:
The authors thank O. Chernyashevskyy and A. Strom for technical assistance and O. A. Mukhanov for useful discussions. M. Belogolovskii acknowledges support from the Fulbright Visiting Scholar Program and the Fundamental Research Programme funded by the Ministry of Education and Science of Ukraine (Project No. 0120U102059). Later stages of this research received support from NSF Grant No. DMR 1905742.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/7
Y1 - 2020/7
N2 - In this work, we realize a physical system - nanoengineered singly connected Josephson junction with a periodic superparamagnetic Ni/Al multilayer - that manifests supercurrent-versus-magnetic field response typical of a dc superconducting quantum interference device (SQUID); however, unlike a SQUID, which involves a superconducting loop occupying significant space, our lumped device is more suitable for miniaturization. In addition, we show that it exhibits enhanced magnetic field sensitivity as compared with conventional superconductor-insulator-superconductor Josephson junctions. SQUID-like oscillatory response to external magnetic fields, analogous to the two-slit optical interference, is explained in terms of the dominance of Andreev bound states localized at the barrier edges in the comparatively thick and strongly anisotropic weak links. Our results may lead to significant advancement in development of nanoscale magnetic sensing techniques applicable to individual molecules or magnetic nanoparticles.
AB - In this work, we realize a physical system - nanoengineered singly connected Josephson junction with a periodic superparamagnetic Ni/Al multilayer - that manifests supercurrent-versus-magnetic field response typical of a dc superconducting quantum interference device (SQUID); however, unlike a SQUID, which involves a superconducting loop occupying significant space, our lumped device is more suitable for miniaturization. In addition, we show that it exhibits enhanced magnetic field sensitivity as compared with conventional superconductor-insulator-superconductor Josephson junctions. SQUID-like oscillatory response to external magnetic fields, analogous to the two-slit optical interference, is explained in terms of the dominance of Andreev bound states localized at the barrier edges in the comparatively thick and strongly anisotropic weak links. Our results may lead to significant advancement in development of nanoscale magnetic sensing techniques applicable to individual molecules or magnetic nanoparticles.
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U2 - 10.1103/PhysRevApplied.14.014092
DO - 10.1103/PhysRevApplied.14.014092
M3 - Article
AN - SCOPUS:85089519997
SN - 2331-7019
VL - 14
JO - Physical Review Applied
JF - Physical Review Applied
IS - 1
M1 - 014092
ER -