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Cantilever-based measurements on nan...

Stanford University.

Cantilever-based measurements on nanomagnets and superconductors.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Cantilever-based measurements on nanomagnets and superconductors.
Author:	Straver, Eric.
Description:	170 p.
Notes:	Adviser: Kathryn A. Moler.
Notes:	Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4633.
Contained By:	Dissertation Abstracts International65-09B.
Subject:	Physics, Condensed Matter.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3145538
ISBN:	0496044893

Cantilever-based measurements on nanomagnets and superconductors.
Straver, Eric.

Cantilever-based measurements on nanomagnets and superconductors. - 170 p.

Adviser: Kathryn A. Moler.

Thesis (Ph.D.)--Stanford University, 2004.

Magnetic force microscopy (MFM) is a powerful technique for manipulating vortices and for characterizing vortex pinning. The microscope I have constructed is capable of imaging vortices with high spatial resolution, and also of directly manipulating them and characterizing the pinning strength. I present magnetic force gradient images of vortices in Nb and YBCO thin films at various temperatures, magnetic fields, and scan heights. I have also demonstrated the ability to directly manipulate individual vortices with the MFM cantilever. By pulling the vortices with an attractive magnetic force, I have positioned them to construct the initials "SU", for Stanford University. This is the first demonstration of such control over vortex position using any technique, and has the potential to enable a number of future experiments on the behavior of vortices. For example, I have examined vortex pinning in Nb and YBCO, and have studied the distribution of pinning strengths.

ISBN: 0496044893Subjects--Topical Terms:

226939
Physics, Condensed Matter.

Cantilever-based measurements on nanomagnets and superconductors.
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245 1 0 $a Cantilever-based measurements on nanomagnets and superconductors.
300 $a 170 p.
500 $a Adviser: Kathryn A. Moler.
500 $a Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4633.
502 $a Thesis (Ph.D.)--Stanford University, 2004.
520 # $a Magnetic force microscopy (MFM) is a powerful technique for manipulating vortices and for characterizing vortex pinning. The microscope I have constructed is capable of imaging vortices with high spatial resolution, and also of directly manipulating them and characterizing the pinning strength. I present magnetic force gradient images of vortices in Nb and YBCO thin films at various temperatures, magnetic fields, and scan heights. I have also demonstrated the ability to directly manipulate individual vortices with the MFM cantilever. By pulling the vortices with an attractive magnetic force, I have positioned them to construct the initials "SU", for Stanford University. This is the first demonstration of such control over vortex position using any technique, and has the potential to enable a number of future experiments on the behavior of vortices. For example, I have examined vortex pinning in Nb and YBCO, and have studied the distribution of pinning strengths.
520 # $a Nanomagnetism and superconductivity are two current areas of interesting research, both for fundamental and technological reasons. In this work, I have used microfabricated cantilevers for cantilever magnetometry measurements of cobalt nanoparticles, and also for magnetic force microscopy studies of vortices in niobium and YBCO.
520 # $a Nanomagnets are of great interest because of their potential applications in such areas as storage media, spin electronics, and magnetic sensors. Chemically synthesized monodisperse cobalt nanocrystals with diameters on the order of 10 nm offer a potentially excellent material for such applications. I have characterized their magnetic properties by measuring the low temperature hysteresis loops of small numbers (&sim;1000's) of Co nanocrystals using the technique of cantilever magnetometry, with a moment sensitivity of 106 mu B.
520 # $a Since the invention of the atomic force microscope in 1986, cantilevers have become a powerful and popular sensor for studying a wide variety of materials and properties. Cantilever-based magnetic imaging (magnetic force microscopy) is a common characterization technique for materials at room temperature, however, low temperature imaging systems with a focus on magnetism remain rare. For this work, I have constructed a low temperature cantilever measurement system, capable of making sensitive cantilever magnetometry measurements, and used in particular for magnetic force microscopy.
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710 0 # $a Stanford University. $3 212607
773 0 # $g 65-09B. $t Dissertation Abstracts International
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790 1 0 $a Moler, Kathryn A., $e advisor
791 $a Ph.D.
792 $a 2004
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