The ALBA spectroscopic LEEM-PEEM experimental station: layout and performance

Abstract

The spectroscopic LEEM-PEEM experimental station at the CIRCE helical undulator beamline, which started user operation at the ALBA Synchrotron Light Facility in 2012, is presented. This station, based on an Elmitec LEEM III microscope with electron imaging energy analyzer, permits surfaces to be imaged with chemical, structural and magnetic sensitivity down to a lateral spatial resolution better than 20 nm with X-ray excited photoelectrons and 10 nm in LEEM and UV-PEEM modes. Rotation around the surface normal and application of electric and (weak) magnetic fields are possible in the microscope chamber. In situ surface preparation capabilities include ion sputtering, high-temperature flashing, exposure to gases, and metal evaporation with quick evaporator exchange. Results from experiments in a variety of fields and imaging modes will be presented in order to illustrate the ALBA XPEEM capabilities.

Co on Fe3O4(001): Towards precise control of surface properties

“…28 In pure low-energy electron microscopy (LEEM) 29 mode, the microscope is used for microspot low-energy diffraction measurements and real-time imaging in bright or dark-field LEEM. It can be used in photoelectron microscopy mode (XPEEM), i.e., with x-rays, where images are acquired with the energy-filtered photoelectrons from micron-sized selected areas of the surface with an energy resolution down to 0.2 eV.…”

Mössbauer and Magnetic Properties of Coherently Mixed Magnetite-Cobalt Ferrite Grown by Infrared Pulsed-Laser Deposition

“…At the CIRCE beamline, spectro-microscopy was performed in remanence with a spectroscopic and low-energy electron microscope (SPELEEM). [13,14] The microscope can be used either for low-energy electron microscopy and diffraction (LEEM [15] and LEED) or with X-rays, i.e. in photoelectron microscopy mode (XPEEM).…”

Direct observation of transverse and vortex metastable magnetic domains in cylindrical nanowires

“…XMCD-PEEM experiments were performed at the CIRCE beamline of the ALBA Synchrotron [25]. For Ni-rich nanowires (Co 35 Ni 65 ), a highly uniform axially magnetized state is obtained at remanence (see Fig.…”