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Title: Spin-Orbit Induced-Spin Torques in Single Ferromagnets
Originating Office: IAS
Speaker: Manchon, Aurelien C
Issue Date: 16-Dec-2012
Event Date: 16-Dec-2012
Group/Series/Folder: Record Group 8.15 - Institute for Advanced Study
Series 3 - Audio-visual Materials
Location: 8.15:3 box 1.8
Notes: IAS Asia Pacific Workshop on Condensed Matter Physics. Talk no. 22
Title from title slide.
Host: Institute for Advanced Study.
Sponsor: The Collaborative Research Fund (CRF), The Research Grants Council (RGC).
Abstract: Manipulating the magnetization of a ferromagnet using spin-polarized current has been made possible via the theoretical and experimental demonstration of spin transfer torque in ferromagnetic spin-valves. Alternatively, it has been recently demonstrated that appropriately designed spin-orbit coupling (SOC) can be used to generate spin torque (coined SOC-torque) in a single ferromagnet, without the need of an external polarizer. This effect has been observed experimentally in both metallic and semiconducting systems. Interestingly, due to the complex structure of metallic systems, the microscopic origin of the current-driven magnetization dynamics is still under debate. In this presentation, the speaker will examine the different origins of the SOC-torque and discuss experimental implications. In the first part, the speaker will introduce the concept of Rashba spin-orbit coupling in 2 dimensional electron gases and show that it can be extended to sharp interfaces. In the second part, the speaker will discuss the spin-dependent transport in the presence of strong spin-orbit coupling through drift-diffusion model and its implication in terms of SOC-torque. Rashba torque and spin Hall effect torques will be addressed. Finally, the experimental issues related to the extraction of these torques will be discussed.
Duration: 36 min.
Appears in Series:8.15:3 - Audio-visual Materials
Videos for Public -- Distinguished Lectures