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MA: Magnetismus

MA 33: Spin-Dynamics, Magnetization Reversal III

MA 33.2: Vortrag

Donnerstag, 30. März 2006, 15:30–15:45, HSZ 403

Magnetization switching by spin transfer torque in magnetic nanostructures — •Nicolas Müsgens¹, Georg Richter¹, Barbaros Özyilmaz^1,2, Michael Fraune¹, Matthias Hawraneck¹, Bernd Beschoten¹, Matthias Bückins³, Joachim Mayer³, and Gernot Güntherodt¹ — ¹II. Phyikalisches Institut , RWTH Aachen, and Virtual Institut of Spin Electronics (ViSel), Templergraben 55, 52056 Aachen, Germany — ²Department of Physiks, Columbia University, New York, NY 10027, USA — ³Gemeinschaftslabor für Elektronenmikroskopie, RWTH Aachen, 52056 Aachen, Germany

The transfer of a torque of spin-polarized currents onto macroscopic magnetizations has been investigated in confined magnetic nanostructures. Nanostencil masks are used to define the device dimensions (sub 100 nm2) prior to the deposition of the thin Co/Cu/Co stack with perpendicular current. The masks consist of a focused-ion-beam (FIB) milled nano-aperture in a top metal layer on top of an insulator and an underlying pre-patterned bottom electrode. The insulator causes an undercut by its selective wet etching. The approach is demonstrated by spin transfer torque-induced magnetization dynamics, giving rise to a giant magneto-resistance effect of 0.3 % at room temperature.

Supported by DFG-SPP 1133 and by HGF.