Ultrahigh-spatial-resolution chemical and magnetic imaging by laser-based photoemission electron microscopy

The Review of Scientific Instruments
Toshiyuki TaniuchiShik Shin

Abstract

We report the first experiments carried out on a new chemical and magnetic imaging system, which combines the high spatial resolution of a photoemission electron microscope (PEEM) with a continuous-wave deep-ultraviolet laser. Threshold photoemission is sensitive to the chemical and magnetic structures of the surface of materials. The spatial resolution of PEEM is limited by space charging when using pulsed photon sources as well as aberrations in the electron optics. We show that the use of a continuous-wave laser enabled us to overcome such a limit by suppressing the space-charge effect, allowing us to obtain a resolution of approximately 2.6 nm. With this system, we demonstrated the imaging of surface reconstruction domains on Si(001) by linear dichroism with normal incidence of the laser beam. We also succeeded in magnetic imaging of thin films with the use of magnetic circular dichroism near the Fermi level. The unique features of the ultraviolet laser will give us fast switching of the incident angles and polarizations of the photon source, which will be useful for the characterization of antiferromagnetic materials as well as ferromagnetic materials.

References

Dec 12, 2001·Physical Review Letters·H OhldagR L White
Jun 29, 2006·Physical Review Letters·Takeshi Nakagawa, Toshihiko Yokoyama
Jun 21, 2007·The Review of Scientific Instruments·Takeshi NakagawaMasahiro Katoh
Feb 1, 2008·Physical Review Letters·D ThienE Pehlke
Apr 1, 2009·Proceedings of the National Academy of Sciences of the United States of America·Yurong MaSteve Weiner
Jan 15, 2011·Ultramicroscopy·Andrea LocatelliErnst Bauer
Aug 5, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·E Bauer
Aug 5, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·N M BuckanieF-J Meyer Zu Heringdorf

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Citations

Aug 20, 2015·ACS Nano·Miho FujiharaYasumitsu Miyata
Jul 3, 2015·Journal of Synchrotron Radiation·Rachid BelkhouDidier Dalle

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