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

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dc.contributor.advisorDunning, F. B.en_US
dc.creatorBarnes, Julius, IIen_US
dc.date.accessioned2009-06-04T08:42:01Zen_US
dc.date.available2009-06-04T08:42:01Zen_US
dc.date.issued1999en_US
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.en_US
dc.format.extent64 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoTHESIS PHYS. 1999 BARNESen_US
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>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/19351en_US
dc.language.isoengen_US
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.en_US
dc.subjectPhysicsen_US
dc.subjectElectromagneticsen_US
dc.subjectCondensed matter physicsen_US
dc.subjectAtomic physicsen_US
dc.titleImplementation of SEMPA using a high efficiency retarding-potential Mott polarimeteren_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentPhysicsen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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