Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.28: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Current induced domain wall nucleation and motion in an out-of-plane magnetized CoFeB-MgO nanowire — •Tomek Schulz¹, Tim Zacke¹, Su Jung Noh¹, Berthold Ocker², Capucine Borrowes³, Dafiné Ravelsona³, and Mathias Kläui¹ — ¹Institut of Physics, Johannes Gutenberg-Univesity Mainz, Germany — ²Singulus Technologies AG, Kahl am Main, Germany — ³Laboratoire de Physique des Solides, Universite Paris-sud, France

For a racetrack device, an appropriate material composition which is compatible with high TMR MgO-based barriers for readout has been developed. We report on transport measurements on a magnetic nanowire structure consisting of a Ta/CoFeB/MgO-multilayer with a perpendicular magnetic anisotropy. By applying single short current pulses through a gold wire on top of the nanowire it is possible to nucleate domain walls only by the generated Oersted field. After the nucleation, we investigated the spin torque properties of this multilayer stack for current induced domain wall motion using the current-field equivalence method [1]. Another approach to determine the acting torques is using the 2nd Harmonics signal of an alternating current [2].

[1] J. Heinen et al., Appl. Phys. Lett. 96, 202510 (2010) [2] U. H. Pi et al., APL, 97, 162507 (2010)