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Mapping of Magnetic Fields on a 1000-Angstrom Scale Using a Spring-Tip Technique and Optical Displacement Detection

IP.com Disclosure Number: IPCOM000040514D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Martin, Y: AUTHOR [+3]

Abstract

Magnetic fields can be mapped with a resolution of 1000 Angstroms using a spring-tip technique and optical displacement detection. In operation, a spring-tip of magnetic iron is positioned close to the surface of the magnetic material to be examined. A coil at the other end of the tip sends a guided magnetic flux through the tip. The magnetic field generated at the end of the tip interacts with the local magnetic field of the sample, and a resulting force bends the tip, upward or downward, depending on the signs of both fields. A phase- sensitive optical probe accurately measures the position of the spring, relative to a fixed mirror rigidly connected to the spring base. Alternatively, an AC displacement can be generated on the tip by an AC magnetic field and measured with the probe.

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Mapping of Magnetic Fields on a 1000-Angstrom Scale Using a Spring-Tip Technique and Optical Displacement Detection

Magnetic fields can be mapped with a resolution of 1000 Angstroms using a spring-tip technique and optical displacement detection. In operation, a spring-tip of magnetic iron is positioned close to the surface of the magnetic material to be examined. A coil at the other end of the tip sends a guided magnetic flux through the tip. The magnetic field generated at the end of the tip interacts with the local magnetic field of the sample, and a resulting force bends the tip, upward or downward, depending on the signs of both fields. A phase- sensitive optical probe accurately measures the position of the spring, relative to a fixed mirror rigidly connected to the spring base. Alternatively, an AC displacement can be generated on the tip by an AC magnetic field and measured with the probe. An independent measurement system is used to maintain a constant average distance between the tip and the sample as the sample is rastered to form the magnetic image. The same technique can also be employed to read magnetic data at a density of one bit per 10-2m2 area with a bandwidth of 1 MHz.

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