2014/02/11 by Chad C. Geppert, Chad Geppert, L. R. Wienkes +15
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Magnetic properties of thin films #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum and electron transport phenomena #cond-mat.mes-hall
paper · pdf · doi:10.48550/arxiv.1402.2638
4 figures, submitted to Phys. Rev. Lett
arxiv created 2014/02/11 · openalex publication_date 2014/02/11 · arxiv updated 2014/02/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report on a method of quantifying spin accumulation in Co2MnSi/n-GaAs and Fe/n-GaAs heterostructures using a non-magnetic probe. In the presence of a large non-equilibrium spin polarization, the combination of a non-constant density of states and energy-dependent conductivity generates an electromotive force (EMF). We demonstrate that this signal dephases in the presence of applied and hyperfine fields, scales quadratically with the polarization, and is comparable in magnitude to the spin-splitting. Since this spin-generated EMF depends only on experimentally accessible parameters of the bulk material, its magnitude may be used to quantify the injected spin polarization in absolute terms.