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SUMMARY:Low energy electron microscopy & spectroscopy in magnetic ultrathi
 n films - Prof. Wen-Xin Tang\, College of Materials Science and Engineerin
 g\, Chongqing University\, Chongqing 400044\, P. R. China
DTSTART:20160922T130000Z
DTEND:20160922T140000Z
UID:TALK67774@talks.cam.ac.uk
CONTACT:Adrian Ionescu
DESCRIPTION:The study and control of magnetic ultrathin films are of great
  interest both from a fundamental\npoint of view and for important applica
 tions in the technology of information. The art\nexperimental and theoreti
 cal works in the field of ultrafast magnetization dynamics are growing\nra
 pidly\, with a particular emphasis on the low-dimensional magnetic materia
 ls and spin dynamics.\nThe physical mechanisms involving the spin dynamics
  when exciting magnetic nanostructures are\nimportant. The variety of expe
 rimental methods used to explore the magnetic properties of the\nmaterials
  on a broad range of temporal and spatial scales are needed.\nIn this talk
 \, we discuss the role of spin polarized low energy electron\nspectroscopy
 /microscopy on probing spin dynamics in ultrathin magnetic film through in
 elastic\nspin-dependent scattering. We will also discuss a novel time-reso
 lved spin polarized low energy\nelectron microscopy (TR-SPLEEM) concept wh
 ich is enable to reveal these spin dynamics\nexperimentally. The commissio
 ning of a novel aberration corrected low energy electron\nmicroscope (AC-L
 EEM)\, allowing the incorporation of an ultrafast spin-polarized electron 
 source\nwithout degrading spatial resolution is explained. A spatial spin 
 resolution of 3 nm and temporal\nresolution of 1-10 picosecond (ps) are ex
 pected in the near future. This unique three-prism AC-\nLEEM has been succ
 essfully finished with the cold field emission source\, with a spatial res
 olution\n1.8 nm in our recent testing. Atomic resolution is achieved with 
 a high-temperature STM that is\nsuccessfully integrated with the system. A
  2D materials Cu 2 Si growth process is demonstrated by\ncombining our hig
 h resolution LEEM and STM\, the direct evidence of atomic exchange process
  in\nthis 2D system formation is obtained at 920K. The structure is determ
 ined by very low energy\nelectron diffraction.
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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