Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 22: Spin Dynamics / Spin Torque III

MA 22.4: Talk

Thursday, March 25, 2010, 10:30–10:45, H10

Spin-transfer torque experiments on magnetic disks near the vortex regime — •Volker Sluka, Daniel Bürgler, and Claus Schneider — Institute of Solid State Research, Research Center Jülich, Jülich, Germany

In thin magnetic disks vortex states appear as ground states of magnetization as a result of the interplay between exchange interaction and dipolar energy. The vortex structure can be divided into two regions. The magnetization basically lies in the disk plane while possessing a circular shape, thereby closing the flux and minimizing the stray field. In the center of this pattern referred to as the vortex core region however, this would lead to a strong build-up of exchange energy. Therefore in this part the magnetization points out of plane, defining the vortex polarity. In this work nano-pillars containing two single crystalline Fe disks close to the vortex regime have been prepared. The structures are processed from MBE grown layers and have diameters of roughly 150 nm. The 30 and 15 nm thick disks are seperated by a non-magnetic spacer (Ag, 6 nm). DC and HF measurements are performed to investigate the nano-pillar's response to external fields and pulsed / constant currents.