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:
Aug. 28, 2007
Filed:
Sep. 15, 2004
Solomon I. Woods, Kensington, MD (US);
Lee A. Knauss, Bowie, MD (US);
Nesco M. Lettsome, Beltsville, MD (US);
Alfred B. Cawthorne, Beltsville, MD (US);
Thirumalai Venkatesan, Washington, DC (US);
Solomon I. Woods, Kensington, MD (US);
Lee A. Knauss, Bowie, MD (US);
Nesco M. Lettsome, Beltsville, MD (US);
Alfred B. Cawthorne, Beltsville, MD (US);
Thirumalai Venkatesan, Washington, DC (US);
Neocera, LLC, Beltsville, MD (US);
Abstract
A scanning microscope for high resolution current imaging by direct magnetic field sensing of a sample maintained in an ambient environment. The scanning microscope uses a magnetic sensor such as a SQUID and a fiber probe magnetically coupled between the SQUID sensor and the sample under study. The fiber probe has a sharply defined tip for high resolution probing and for reaching minute cavities on the surface of the sample. The coupling between the tip of the fiber probe and the sample is controlled by a distance control mechanism, in the range of 1-100 nm. The material of the fiber probe with high permeability and low magnetic noise is chosen to optimize flux transmission to the magnetic sensor. Magnetic coupling to the sensor is maximized by keeping the distance between the end of the fiber probe and the sensor to approximately 0-100 μm. The fiber probe is integrated into the fiber holder for easy replacement of the fiber probe.