The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 2006
Filed:
Mar. 17, 2005
John Matthews, Greenbelt, MD (US);
Frederick Charles Wellstood, Fairfax, VA (US);
Soun Pil Kwon, Hyattsville, MD (US);
Kosta P. Vlahacos, Clarksville, MD (US);
John Matthews, Greenbelt, MD (US);
Frederick Charles Wellstood, Fairfax, VA (US);
Soun Pil Kwon, Hyattsville, MD (US);
Kosta P. Vlahacos, Clarksville, MD (US);
University of Maryland, College Park, MD (US);
National Security Agency, Fort George Meade, MD (US);
Abstract
A scanning SQUID microscope capable of high frequency magnetic field measurements uses a hysteretic SQUID detector and a pulsed sampling technique which permits to extend the bandwidth of the SQUID microscope to above GHz region. The system can be readily incorporated into a 4.2scanning SQUID microscope for imaging chips at room temperature. By biasing the hysteretic SQUID with pulses of a predetermined amplitude, and adjusting a modulation flux applied to the hysteretic SQUID at a plurality of time delays between the activation of the sample under study and the bias pulse, the hysteretic SQUID can be switched on, and the modulation flux value corresponding to such a switching event as a function of time is considered as representation of the magnetic field emanating from the sample under study.