Seminars

Seminars are usually held on Wednesdays at 4.00 pm in Bell Lecture Theatre,
Main Physics Building. (location)
You are very welcome!

Seminar coordinator: Dr A Ferraro - a.ferraro@qub.ac.uk

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Upcoming Seminars:


Monday, May 08 2017, 04:00 PM, Room 0G.006, Maths and Physics Teaching Centre

Prof James Williams (University of Western Australia)

Spin-dependent interactions:

A fundamental basis for magnetism and spin-electronics.

“Flowers from other Gardens”


The challenges and practices of how to observe and control the interplay between electron correlations, electron exchange, spin-orbit coupling, and field distortions within compound atomic structures are emerging from current research activity. Studies of the physical interactions have accumulated from:

• spin-polarized electron momentum probing exchange (zinc and inert gases) and spin-orbit coupling (with geometric phase) in free single atoms,
• spin polarized momentum dispersion in multilayered (Ag, Fe on W) thin films and surfaces,
• elemental momentum density dispersion in doped perovskite oxides, Zn2-xTi1-2xTa2xO4
• polymer blends such as polyvinyl, polyacetates, graphene, reduced graphene oxides,
• positronium Coincidence Doppler Broadening of elemental electron density dispersions.

Discussion will concern concepts at an introductory level.

References.

• Proc Phys Soc 74, 369 (1959) The early stages of spark channel expansion. JM Sommerville and JF Williams
• Physics Reports C 34, 325-369 (1977) Electron scattering by atoms and molecules. PG Burke and JF Williams
• Phys Rev A 85, 022701 (2012). Topological angular momentum in electron exchange excitation of a single atom. JF. Williams, L. Pravica and S N Samarin
• Surface Science, 617 22 (2013). Probing surface magnetism by spin-polarized electron spectroscopy: Fe film on W(110), S Samarin, O Artamonov, P Guagliardo, K Sudarshan, M Kostylev, L Pravica, A Baraban, JF. Williams
• J Amer Ceramic Soc, 96 3286 (2013). Positron Annihilation in Off-Stoichiometric and Ta-Doped n2TiO4. P. Guagliardo, ER Vance, GR Lumpkin, MG Blackford, K Sudarshan, J Davis, S Samarin, JF Williams.
• J Phys: Conf Ser 443 012048 (2013). Interface profile studies in immiscible and partially miscible binary polymer blends from free volume measurement. P Ramya, D Meghala, T Pasang, JM Raj, C Ranganath and JF Williams
• Applied Phys Lett, 106 (2015) 4. Controlling spin-orbit interaction in ferromagnetic Fe/Au double layer Samarin, S.N., Artamonov, O.M., Baraban, A.P., Kostylev, M.P., Guagliardo, P.R., Williams, J.F.