Spin relaxation mechanism in Silver nanowires covered with MgO protection layer

Abstract

Spin-flip mechanism in Ag nanowires with MgO surface protection layers has been investigated by means of nonlocal spin valve measurements using Permalloy/Ag lateral spin valves. The spin flip events mediated by surface scattering are effectively suppressed by the MgO capping layer. The spin relaxation process was found to be well described in the framework of Elliott-Yafet mechanism and then the probabilities of spin-filp scattering for phonon or impurity mediated momentum scattering is precisely determined in the nanowires. The temperature dependent spin-lattice relaxation follows the Bloch-Grüneisen theory and falls on to a universal curve for the monovalent metals as in the Monod and Beuneu scaling determined from the conduction electron spin resonance data for bulk.

18 pages, 3figures

References in corpus (4)

• Temperature dependence of the resistance of metallic nanowires (diameter $\ge$ 15 nm): Applicability of Bloch-Grüneisen theorem
• Giant enhancement of spin accumulation and long-distance spin precession in metallic lateral spin valves
• Surface spin flip probability of mesoscopic Ag wires
• Enhanced spin-flip scattering at the surface of copper in lateral spin valves

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• Effect of anisotropic spin absorption on the Hanle effect in lateral spin valves
• Spin relaxation through Kondo scattering in Cu/Py lateral spin valves
• Theory of Kondo suppression of spin polarization in nonlocal spin valves
• Spin relaxation characteristics in Ag nanowire covered with various oxides
• Spin dependent transport characterization in metallic lateral spin valves using 1D and 3D modeling
• Detection of the interfacial exchange field at a ferromagnetic insulator-nonmagnetic metal interface with pure spin currents
• Spin transport enhancement by controlling the Ag growth in lateral spin valves