Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 28: Spin-dependent Transport Phenomena

MA 28.6: Vortrag

Donnerstag, 25. März 2010, 16:30–16:45, H3

X-ray microscopy and transport measurements in lateral spin valves including tunneling barriers — •Jeannette Wulfhorst¹, Andreas Vogel¹, Lars Bocklage¹, Peter Fischer², Ulrich Merkt¹, and Guido Meier¹ — ¹Institut für Angewandte Physik, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany — ²Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

Various approaches to generate, manipulate, and detect spin currents are presently investigated. In lateral all-metal spin valves, generation and nonlocal detection of spin-polarized currents are realized with ferromagnetic materials, e.g., permalloy. The generated spin current is injected into a normal metal and can be manipulated by a perpendicular external magnetic field [1,2]. Transport measurements at temperatures of liquid helium are performed and the Hanle effect is observed. From the comparison of the experimental data amd theory, the spin-relaxation time and -length in copper are determined. High resolution transmission soft X-ray microscopy with magnetic contrast is used to image spin accumulation in copper [3]. The images show indications of spin accumulation at 933 eV after optimization of the magnetic contrast via energy scans. This work has been supported by DFG and by DOE.

[1] A. van Staa et al., Phys. Rev. B 77, 214416 (2008)

[2] A. Vogel et al., Appl. Phys. Lett. 94, 1225210 (2009)

[3] O. Mosendz et al., Phys. Rev. B 80, 104439 (2009)