Sensors for scanning SQUID microscopy approaching and surpassing single electron spin sensitivity

Speaker
Prof. Martin Huber, UC Denver
Date
27/03/2014 - 15:30 - 14:30Add to Calendar 2014-03-27 14:30:00 2014-03-27 15:30:00 Sensors for scanning SQUID microscopy approaching and surpassing single electron spin sensitivity Superconducting quantum interference devices (SQUIDs) are among the most sensitive sensors for magnetic field, and nanoscale SQUIDs, in particular, also have high  sensitivity to magnetic dipole fields. The sensitivity of SQUIDs with submicron sensor  areas is better than ~100 µB/√Hz, where µB is the Bohr magneton, the magnetic dipole  moment of the electron. When coupled with a scanning platform, these nanoscale  SQUIDs become powerful tools for studying properties of magnetic systems, including  persistent currents in normal metal rings, local measurements of penetration depths in  high Tc  superconductors, vortex dynamics in type II superconductors, and imaging edge  currents in topological insulators. I will describe two such nanoscale SQUID sensors,  planar SQUID susceptometers with sensitivities of ~70 µB/√Hz and needle-like SQUID  magnetometers with sensitivities better than 1 µB/√Hz, concluding with recent results of,  and future plans for, studies using these sensors. Resnick Building 209, room 210 המחלקה לפיזיקה physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Resnick Building 209, room 210
Abstract

Superconducting quantum interference devices (SQUIDs) are among the most sensitive

sensors for magnetic field, and nanoscale SQUIDs, in particular, also have high 

sensitivity to magnetic dipole fields. The sensitivity of SQUIDs with submicron sensor 

areas is better than ~100 µB/√Hz, where µB is the Bohr magneton, the magnetic dipole 

moment of the electron. When coupled with a scanning platform, these nanoscale 

SQUIDs become powerful tools for studying properties of magnetic systems, including 

persistent currents in normal metal rings, local measurements of penetration depths in 

high Tc

 superconductors, vortex dynamics in type II superconductors, and imaging edge 

currents in topological insulators. I will describe two such nanoscale SQUID sensors, 

planar SQUID susceptometers with sensitivities of ~70 µB/√Hz and needle-like SQUID 

magnetometers with sensitivities better than 1 µB/√Hz, concluding with recent results of, 

and future plans for, studies using these sensors.

תאריך עדכון אחרון : 24/03/2014