Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 75: Focus Session: Spin-Orbit Torque at Surfaces and Interfaces (organized by MA)

TT 75.3: Topical Talk

Mittwoch, 2. April 2014, 16:00–16:30, BEY 118

Domain-wall depinning governed by the spin Hall effect — •Reinoud Lavrijsen, Bert Koopmans, Henk Swagten, Elena Mure, Jeroen Franken, and Pascal Haazen — Department of Applied Physics, Eindhoven University of Technology, Eindhoven, The Netherlands

Current induced domain wall motion (CIDWM) in perpendicular materials has caused much excitement over the last few year years due to the discovery of unexpected DW driving mechanisms. Recently, we have shown that the Spin Hall Effect (SHE) [1,2] provides a radically new mechanism for CIDWM in these systems [3]. Essential for this work was the ability to create and pin DWs at well-defined positions in a Pt/Co/Pt nanowire. By studying the depinning of these DW*s as function of applied field directions and current we were able to disentangle different contributions. This allows us to unambiguously identify the SHE as the driving mechanism.

In the first part of this talk we will discuss the SHE mechanism and introduce an DW depinning experiment that allows us to disentangle different contributions to CIDWM. In the second part of this talk we will discuss potential applications of the SHE for magnetization manipulation in gated heterostructures. Furthermore, we will discuss preliminary experiments where we study the effect of growth conditions on the SHE efficiency.

[1] I. M. Miron et al., Nature 476, 189 (2011) [2] L. Liu et al., Science 336, 555 (2012) [3] P.P.J. Haazen et al., Nature Materials, 12, 299-303 (2013