Self-aligned nanoscale SQUID on a tip.
A nanometer-sized superconducting quantum interference device (nanoSQUID) is fabricated on the apex of a sharp quartz tip and integrated into a scanning SQUID microscope. A simple self-aligned fabrication method results in nanoSQUIDs with diameters down to 100 nm with no lithographic processing. An aluminum nanoSQUID with an effective area of 0.034 microm2 displays flux sensitivity of 1.8 x 10(-6) Phi(0)/Hz(1/2) and operates in fields as high as 0.6 T. With projected spin sensitivity of 65 micro(B)/Hz(1/2) and high bandwidth, the SQUID on a tip is a highly promising probe for nanoscale magnetic imaging and spectroscopy.
Finkler
Amit
A
Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel. amit.finkler@weizmann.ac.il
Segev
Yehonathan
Y
Myasoedov
Yuri
Y
Rappaport
Michael L
ML
Ne'eman
Lior
L
Vasyukov
Denis
D
Zeldov
Eli
E
Huber
Martin E
ME
Martin
Jens
J
Yacoby
Amir
A
D004867:Equipment Design; D019544:Equipment Failure Analysis; D008280:Magnetics / Q000295:instrumentation*; D020527:Microscopy, Scanning Probe / Q000295:instrumentation*; D036103:Nanotechnology / Q000295:instrumentation*; D014159:Transducers