Implementation of SEMPA using a high efficiency retarding-potential Mott polarimeter

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dc.contributor.advisorDunning, F. B.
dc.creatorBarnes, Julius, II
dc.date.accessioned2009-06-04T08:42:01Z
dc.date.available2009-06-04T08:42:01Z
dc.date.issued1999
dc.description.abstractScanning Electron Microscopy with Polarization Analysis (SEMPA) provides a novel tool with which to image surface magnetic structure. In SEMPA, a tightly focussed electron beam is directed at the sample surface and the polarization of the ejected low-energy secondary electrons, which mirrors the local surface magnetization, is measured. A magnetic image is then built up by scanning the incident electron beam point-by-point over the sample surface. Here, a new SEMPA instrument is described that makes use of a high-efficiency retarding-potential Mott polarimeter. The incident electron beam is provided by an ISI-SX40 SEM column. Low-energy secondary electrons ejected from the sample surface are collected and transported to the Mott polarimeter by a series of electrostatic lenses. A Wein spin rotator is also included in the electron transport optics to allow measurement of the full vector polarization of the ejected electrons, and thus the surface vector magnetization. Tests show that the performance of the present SEMPA instrument is superior to that of earlier designs. The apparatus has been used to image the domain structure on the surface of an Fe 3% Si sample, and to image tracks recorded in-plane on a cobalt alloy medium.
dc.format.extent64 p.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.callnoTHESIS PHYS. 1999 BARNES
dc.identifier.citationBarnes, Julius, II. "Implementation of SEMPA using a high efficiency retarding-potential Mott polarimeter." (1999) Diss., Rice University. <a href="https://hdl.handle.net/1911/19351">https://hdl.handle.net/1911/19351</a>.
dc.identifier.urihttps://hdl.handle.net/1911/19351
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectPhysics
dc.subjectElectromagnetics
dc.subjectCondensed matter physics
dc.subjectAtomic physics
dc.titleImplementation of SEMPA using a high efficiency retarding-potential Mott polarimeter
dc.typeThesis
dc.type.materialText
thesis.degree.departmentPhysics
thesis.degree.disciplineNatural Sciences
thesis.degree.grantorRice University
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy
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