Photoemission Electron Microscopy
Ultrafast Dynamics

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Lawrence Berkeley National Laboratory

Advanced Light Source
Webmaster
Andreas Scholl
a_scholl@lbl.gov
last update: 02/28/2012
X-PEEM is being used for the study of fore-front scientific problems in magnetism and surface science. The properties of ferromagnetic, antiferromagnetic, and multiferroic thin films are core research areas. For example, X-PEEM was instrumental to obtain a microscopic understanding of exchange bias: the magnetic coupling between a ferromagnet and an antiferromagnet.
Synchrotrons are pulsed sources, permitting pump-probe style experiments with about 70 ps time resolution. The laser pump, x-ray probe X-PEEM experiment shows the dynamics of a magnetic vortex in a rectangular Co patch, revealing that the structure of the nanometer-size core governs the dynamics of the system.
Higher temporal resolution down to 1 ps and possibly below can be achived using streak camera detection. The not spatially-resolved experiment shows the element-resolved demagnetization dynamics of Fe/Gd in response to an ultrafast laser excitations.
  • The bending magnet beamline 7.3.1 powers PEEM-2 with down to 50 nm spatial resolution using x-rays.
  • The new EPU beamline 11.0.1 houses our next generation microscope PEEM-3. This microscope will have an aberration corrected optics and a projected spatial resolution of down to 5 nm. Currently, PEEM-3 offers a spatial resolution down to 30 nm at a microfocus EPU beamline with full polarization control. Sample cooling down to 40 K, sample preparation, magnetic fields, short pulses (>20ns), sample heating are available.

Latest news:

8/27/2012 Schedule for Spring 2012

8/27/2012 First (not optimized) PEEM-3 image using the mirror corrector

First image

August /2012 Aberration corrected optics installed.

First image

12/27/2011 Schedule for Spring 2012.

7/6/2011 Schedule for Fall 2011.

02/10/2011 Exciting low temperature PEEM results: Correlated domain structure in perovskite oxide superlattices exhibiting spin-flop coupling and Direct observation of imprinted antiferromagnetic vortex states in CoO/Fe/Ag(001) discs

12/01/2010 Schedule for Spring 2011.

9/14/2010 A new, faster sample manipulator has been installed. An improved cold holder is available for temperatures down to 20K (liq. He) and 105K (liq. N2).

9/2/2010 Program of ALS User's meeting workshop "X-Ray Spectromicroscopy and Photoemission Electron Microscopy (PEEM)".

8/5/2010 PEEM-3 cooling performance (29.5 K after 22 minutes).

8/5/2010 Revised! Schedule for Fall 2010.

12/1/2009 Schedule for Spring 2010.

11/2/2009 PEEM-3 reaches 32 K using an improved sample cooling system.

10/2/2009 User guest house now open.

3/25/2009 PEEM-3 is back in operation after repairs to the sample manipulator and transfer systems

1/25/2008 - High resolution images of a 25 nm width multilayer at PEEM-3

9/7/2007 - The Advanced Light Source started a new Postdoctoral Scholarshop Program. Check out this program if you are interested in PEEM or Ultrafast Dynamics.

7/12/2007 - Please check out the tutorials!

4/12/2007 - First user beamtime completed successfully at PEEM-3. Now available: Domain imaging and spectromicroscopy at 60 K using liquid Helium cooling.