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Spin dependent mean-free path of low-energy electrons in ferromagnetic materials
Institution:1. Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany;2. Bragg Institute, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia;3. Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany;4. FOCUS GmbH, 65510 Hünstetten-Kesselbach, Germany;1. Lawrence Livermore National Laboratory, Livermore, CA, USA;2. University of Missouri-Rolla, Rolla, MO, USA;3. Boyd Technologies, Santa Rosa, CA, USA;1. Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U.Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium;2. Instituut voor Kern- en Stralingsfysica, K.U.Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium;3. INPAC—Institute for Nanoscale Physics and Chemistry, K.U.Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium;4. DUBBLE@ESRF, 6 Rue Jules Horowitz, F-38043 Grenoble, France;1. Department of Economics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK;2. School of Economics, University of East Anglia, Norwich NR4 7TJ, UK;1. Surface Physics Laboratory, UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore 452001, Madhya Pradesh, India;2. Raja Ramanna Centre for Advanced Technology, Indore 452013, Madhya Pradesh, India;3. Materials Sciences, Ames Laboratory U.S. DOE, Iowa State University, Ames, Iowa 50011-3020, USA
Abstract:Spin resolved attenuation measurements of electrons transmitted through overlayers of Fe and Co show that the electron inelastic mean free path (IMFP) in these materials is spin-dependent at low energies. The spin-up IMFP is larger than the spin-down IMFP. The values from different studies are in reasonable agreement. The data suggest that the origin of the spin dependence is mainly due to inelastic processes. Effects from spin dependent elastic scattering have not been identified directly in these experiments. The spin filter effect based on preferential attenuation of spin-down electrons can be used as a basis of spin polarization detectors.
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