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Super SQUID
Date:11/25/2013

Weizmann Institute scientists have taken a quantum leap toward understanding the phenomenon known as superconductivity: They have created the world's smallest SQUID a device used to measure magnetic fields which has broken the world record for sensitivity and resolution.

Superconductivity is a quantum phenomenon that only occurs when certain materials are cooled to extremely low temperatures. Then, they lose all resistance to the flow of electricity and expel the magnetic fields within them. Although used in everything from MRI scanners to particle accelerators, scientists still do not fully understand the physics that underlies the behavior of superconductors. Among other things, superconducting materials are found in the very SQUIDs used to measure superconducting properties: SQUID stands for Superconducting QUantum Interference Device.

Nano-SQUIDs are placed on probes to scan and measure the magnetic field at different points on a sample, forming an image of the entire surface a bit like creating a heat map of a hand by measuring its temperature at individual points on the fingers and palms.

Even very sensitive SQUIDS present geometric challenges when it comes to scanning materials: They need to be as small as possible to attain the highest image resolution, and they need to get as close as possible to the sample to image the tiniest magnetic features. Postdoctoral fellows Drs. Yonathan Anahory and Denis Vasyukov, and PhD student Lior Embon, along with their colleagues in the lab of Prof. Eli Zeldov of the Condensed Matter Physics Department, have risen to the challenge as reported in Nature Nanotechnology thanks to a unique setup: They took a hollow quartz tube and pulled it into a very sharp point; then succeeded in fabricating a SQUID encircling the tip measuring a mere 46 nm in diameter the smallest SQUID to date. They then constructed a scanning microscope around the tip an achievement that enabled them to obta
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Contact: Yivsam Azgad
news@weizmann.ac.il
972-893-43856
Weizmann Institute of Science
Source:Eurekalert  

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