13-19 June 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

Optical measurement of spin-orbital torque in magnetic bilayers

17 Jun 2015, 08:45
30m
CCIS L1-047 (University of Alberta)

CCIS L1-047

University of Alberta

Invited Speaker / Conférencier invité Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) W1-6 Devices (DCMMP) / Dispositifs (DPMCM)

Speaker

John Q Xiao (University of Delaware)

Description

Spin-orbital coupling driven toques have been observed in magnetic bilayers consisting of a ferromagnet (FM) and heavy metal (HM) or topological insulator (TI). It has been demonstrated that the spin-orbit torques driven by an in-plane current can switch magnetization, manipulate magnetic domains and excite magnetization auto-oscillation. However, the microscopic mechanism for the spin-orbit torques is still under debate. One of the questions is how to differential the contributions from interface due to the Rashba effect or from bulk of nonmagnetic layer due to the spin Hall effect. In this talk, we will present a newly developed, magneto-optic-Kerr-effect (MOKE) based spin-orbit torque magnetometer that measures both field-like torque (TSOF) and damping-like torque (TSOT) with various thicknesses of the FM, HM TL layers. The technique also offers both spatial and time resolution. We observed both TSOF and TSOT are nonlocal and does not require direct contact between FM and HM. By engineering the interface which modifies the Rashba interaction, we are able to show the co-existence of spin Hall and Rashba effect as well as quantify both contributions to spin-orbit torques.

Primary author

John Q Xiao (University of Delaware)

Co-authors

Mrs Halise Celik (University of Delaware) Mr Jun Wu (University of Delaware) Prof. Kyung-Jin Lee (Korea University) Prof. Virginia O. Lorenz (University of Delaware) Mr Wenrui Wang (University of Delaware) Prof. Xin Fan (University of Denver) Mr yunpeng Chen (University of Delaware)

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