NCEM masthead Berkeley Lab logo Phone Book Search A-Z Index
NCEM National Center for Electron Microscopy masthead
NCEM HomeAbout NCEMNCEM ContactSearch NCEM

Microscopes and Facilities
Staff
Becoming an NCEM User

Visiting Scientist Program
Workshops and Seminars
Assistance and Collaboration

Publications

Gallery
Microscopy Links

SPLEEM


The Spin-Polarized Low-Energy Electron Microscope is a unique low-voltage electron microscope for the study of surfaces and interfaces. The instrument is very sensitive to structural and electronic properties of sample surfaces and is well-suited for in-situ research within a highly controlled sample environment. Spin-polarization of the electron beam permits imaging of magnetic domain microstructure. This custom-built equipment is designed to be easily adaptable to enable various types of experiments and exploration of new ideas. During imaging, it is usually possible to provide the following: clean vacuum (low 10-11 torr); variable sample temperature (~130 K to over 2500 K); in-situ deposition of films or multilayers (most metals, some oxides), co-deposition of several components. Within limits, magnetic field at the sample can be adjusted. Samples can be introduced through a loadlock and can be cleaned within the same UHV system (low-energy sputtering with noble- or reactive gases, heating, in-situ cleaving…). Auger-electron spectroscopy and conventional low-energy electron diffraction are available.

(Instrument Schedule & Requirements: 9-5pm daily; no restrictions for approved users)

 

During imaging, it is usually possible to provide:

  • Clean vacuum (low 10-11 torr).
  • Variable sample temperature (~130 K to over 2500 K).
  • In-situ deposition of film or multilayers (most metals, some oxides, co-deposition of several components,…).
  • Within limits, magnetic field at the sample can be adjusted.
  • Samples can be introduced through a loadlock and can be cleaned within the same UHV system (low-energy sputtering with noble- or reactive gases, heating, in-situ cleaving…). Auger-electron spectroscopy and conventional low-energy electron diffraction are available.


Specifications:

  • Electron energy typically 0 to 100 eV, energy width ~0.1 eV.
  • Electron energy typically 0 to 100 eV, energy width ~0.1 eV.
  • Spin-polarization (normally ~30 %) can be adjusted to point in any polar/azimuthal direction
  • Spatial resolution ~10 nm laterally, atomic resolution along surface normal.
  • Angular resolution of magnetization direction can be better than 2 deg.
  • Time resolution: frame rate can be up to 20 fps, exposure time of several ms per frame is usually required for reasonable signal quality, pump/probe operation remains untested.


For updates or questions, contact Andreas Schmid.

 

 

Principles of SPLEEM 1

Principles of SPLEEM 2

Examples of SPLEEM research
Stability of Magnetization Vortex in Nanocrystals
Nanoscale layers of non-magnetic metal support “magnetized” electronic states
Spiraling Magnetization Vector

Recent SPLEEM Publications