Recent highlights of X-ray magnetic scattering studies from surfaces

Technical Report · Thu Dec 31 00:00:00 EST 1998

DOI:https://doi.org/10.2172/307970· OSTI ID:307970

Watson, G M ^[1]; Gibbs, D ^[2]; Lander, G H ^[3]

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1. Univ. of Maryland, Baltimore, MD (United States). Dept. of Physics
2. Brookhaven National Lab., Upton, NY (United States). Dept. of Physics
3. European Inst. of Transuranic Elements, Karlsruhe (Germany)

In this work, recent studies of surface magnetism, as observed by x-ray scattering techniques, are described. The experiments were concerned with uranium dioxide crystals for which x-ray resonance effects enhance the small magnetic signal from the surface. The main result is that, in contrast to the bulk which exhibits a discontinuous magnetic ordering transition, both the (001) and (111) surface layers order continuously. This is reminiscent of the general phenomenon of surface wetting, but had not been previously observed for magnetic materials. Magnetic reflectivity studies show further that the near-surface magnetic layers are more disordered than layers deep in the bulk, even at low temperatures.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 307970
• Report Number(s): BNL-66109; CONF-981076-; ON: DE99001508; BR: KC0202020; TRN: 99:003173
• Resource Relation: Conference: 2. international conference on synchrotron radiation materials science, Kobe (Japan), 30 Oct - 4 Nov 1998; Other Information: PBD: [1998]
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MAGNETIC PROPERTIES
URANIUM DIOXIDE
SURFACES
X RADIATION
SCATTERING
REFLECTIVITY
TEMPERATURE DEPENDENCE
EXPERIMENTAL DATA