A high-efficiency spin-resolved photoemission spectrometer combining time-of-flight spectroscopy with exchange-scattering polarimetry

Review of Scientific Instruments - Tập 81 Số 5 - 2010
Chris Jozwiak1,2,3, J. Graf2, Gennadi Lebedev1, Nord Andresen1, Andreas K. Schmid2, А. В. Федоров1, Farid El Gabaly2,4, Weishi Wan5, Alessandra Lanzara2,3, Z. Hussain1
1Lawrence Berkeley National Laboratory 1 Advanced Light Source, , Berkeley, California 94720, USA
2Lawrence Berkeley National Laboratory 2 Materials Sciences Division, , Berkeley, California 94720, USA
3University of California Berkeley 3 Department of Physics, , California 94720, USA
4Sandia National Laboratories 4 , Livermore, California 94550, USA
5Lawrence Berkeley National Laboratory 5 Accelerator and Fusion Research Division, , Berkeley, California 94720, USA

Tóm tắt

We describe a spin-resolved electron spectrometer capable of uniquely efficient and high energy resolution measurements. Spin analysis is obtained through polarimetry based on low-energy exchange scattering from a ferromagnetic thin-film target. This approach can achieve a similar analyzing power (Sherman function) as state-of-the-art Mott scattering polarimeters, but with as much as 100 times improved efficiency due to increased reflectivity. Performance is further enhanced by integrating the polarimeter into a time-of-flight (TOF) based energy analysis scheme with a precise and flexible electrostatic lens system. The parallel acquisition of a range of electron kinetic energies afforded by the TOF approach results in an order of magnitude (or more) increase in efficiency compared to hemispherical analyzers. The lens system additionally features a 90° bandpass filter, which by removing unwanted parts of the photoelectron distribution allows the TOF technique to be performed at low electron drift energy and high energy resolution within a wide range of experimental parameters. The spectrometer is ideally suited for high-resolution spin- and angle-resolved photoemission spectroscopy (spin-ARPES), and initial results are shown. The TOF approach makes the spectrometer especially ideal for time-resolved spin-ARPES experiments.

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Review of Scientific Instruments

Tập 81 Số 5

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