Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.93: Poster
Friday, March 18, 2011, 11:00–14:00, P2
Finite Element Model of Non-Local Spin Valves — •Xianzhong Zhou, Daniel E. Bürgler, and Claus M. Schneider — Peter Grünberg Institute, PGI-6, Research Center Jülich, D-52425 Jülich, Germany
We study lateral ferromagnetic/nonferromagnetic/ferromagneitc (F/N/F) non-local spin valve with transparent interfaces using the finite element model. The electrical injection and detection of spin accumulation in the non-local spin valve can be described by the diffusion theory of F/N/F junctions. We derive two equations, the diffusion equation and the Poisson equation, which we solve in three-dimensional case using a finite element differential equations analysis library. We obtain the spin up and down electrochemical potentials as well as the spin accumulation signal accessible in experiments. We assume the following parameter: conductivity of F and N σF=6.6· 106 S/m, σN=3.5· 107 S/m, spin diffusion lengths of F and N λF=5 nm, λN=350 nm, and the spin polarization is 30%. When both the width of spin injector and detector increase from 30 to 150 nm, the spin signal decreases from 313 to 82 µΩ. However, if the widths of both injector and detector are fixed to 100 nm, but the thickness of the N increases from 50 to 250 nm, the spin signal first increases and then decreases. Therefore, there is a optimal thickness of the N yielding a maximum spin signal of 192 µΩ.