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Low energy electron microscopy & spectroscopy in magnetic ultrathin films

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The study and control of magnetic ultrathin films are of great interest both from a fundamental point of view and for important applications in the technology of information. The art experimental and theoretical works in the field of ultrafast magnetization dynamics are growing rapidly, with a particular emphasis on the low-dimensional magnetic materials and spin dynamics. The physical mechanisms involving the spin dynamics when exciting magnetic nanostructures are important. The variety of experimental methods used to explore the magnetic properties of the materials on a broad range of temporal and spatial scales are needed. In this talk, we discuss the role of spin polarized low energy electron spectroscopy/microscopy on probing spin dynamics in ultrathin magnetic film through inelastic spin-dependent scattering. We will also discuss a novel time-resolved spin polarized low energy electron microscopy (TR-SPLEEM) concept which is enable to reveal these spin dynamics experimentally. The commissioning of a novel aberration corrected low energy electron microscope (AC-LEEM), allowing the incorporation of an ultrafast spin-polarized electron source without degrading spatial resolution is explained. A spatial spin resolution of 3 nm and temporal resolution of 1-10 picosecond (ps) are expected in the near future. This unique three-prism AC- LEEM has been successfully finished with the cold field emission source, with a spatial resolution 1.8 nm in our recent testing. Atomic resolution is achieved with a high-temperature STM that is successfully integrated with the system. A 2D materials Cu 2 Si growth process is demonstrated by combining our high resolution LEEM and STM , the direct evidence of atomic exchange process in this 2D system formation is obtained at 920K. The structure is determined by very low energy electron diffraction.

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