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http://hdl.handle.net/11375/8088
Title: | A Study of the Magnetic and Structural Properties of Ultrathin Fe/Ni(111)/W(110) Films |
Authors: | Johnston, Hamish |
Advisor: | Venus, David |
Department: | Physics |
Keywords: | Physics;Physics |
Publication Date: | Feb-1997 |
Abstract: | <p>The structural and magnetic properties of ultrathin Fe/Ni(111)/W(110) films are investigated using LEED, two Auger electron spectroscopy techniques and magneto-optic Kerr magnetometry. A 2 ML Ni(111) buffer layer is used to grow fcc Fe(111) films to a thickness of 3 monolayers. The Ni substrate aIIows good wetting and lattice matching of the Fe without significant interfacial diffusion. Above 3ML a continuous structural transition from fcc to bcc is observed.</p> <p>An electron energy analyser for use with a spin polarised low energy electron diffraction (SPLEED) electron spin analyser was designed and built. The energy analyser is used to study the growth mode and structure of ultrathin Fe/Ni(111)/W(110) films using angle resolved auger emission spectroscopy (ARAES). A method is developed to fit computer simulations to the ARAES data to determine the growth mode of ultrathin films.</p> <p>Preliminary magnetic measurements of the fcc phase below 4 ML indicate that the Fe films are ferromagnetic with a magnetic moment perpendicular to the surface at coverages of 0.25 to 2.0 ML. At 2.5 ML a spin reorientation transition appears to occur and both perpendicular and in plane magnetic moments are observed. At 3.0 ML the magnetic moment is in the plane of the film.</p> |
URI: | http://hdl.handle.net/11375/8088 |
Identifier: | opendissertations/3321 4337 1584252 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
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fulltext.pdf | 5.2 MB | Adobe PDF | View/Open |
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