Ultrahigh-spatial-resolution chemical and magnetic imaging by laser-based photoemission electron microscopy
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581 (Japan)
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.
- OSTI ID:
- 22392366
- Journal Information:
- Review of Scientific Instruments, Vol. 86, Issue 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANTIFERROMAGNETIC MATERIALS
ELECTRON MICROSCOPES
ELECTRON MICROSCOPY
EMISSION SPECTROSCOPY
FERMI LEVEL
FERROMAGNETIC MATERIALS
LASERS
MAGNETIC CIRCULAR DICHROISM
PHOTOELECTRON SPECTROSCOPY
PHOTOEMISSION
POLARIZATION
SPACE CHARGE
SPATIAL RESOLUTION
THIN FILMS
ULTRAVIOLET RADIATION