Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/47373
Title: THEORETICAL STUDY OF SPIN TRANSPORT AND SPIN DYNAMICS IN NANOSCALE SPINTRONIC SYSTEMS
Authors: CHEN JI
Keywords: spintronics, spin orbit coupling, spin-dependent transport, gauge field, non-Abelian,spin orbit torque
Issue Date: 14-Jun-2013
Source: CHEN JI (2013-06-14). THEORETICAL STUDY OF SPIN TRANSPORT AND SPIN DYNAMICS IN NANOSCALE SPINTRONIC SYSTEMS. ScholarBank@NUS Repository.
Abstract: Spintronics utilizes the intrinsic spin property of electrons for the next generation of nanoscale devices. A key requirement of spintronic technology is the control and manipulation of electron spin transport dynamics by external means. This may be achieved via the spin-orbit coupling (SOC) effect which generates an effective magnetic field by electrical means. In this thesis, we theoretically study spin transport and spin dynamics in various spintronic systems under the SOC effect. We consider the spin transport across a square ring nanostructure in the presence of interference of the Aharonov-Casher phases arising from the Rashba SOC effect. Based on our study which adopted the non-equilibrium Green's function formalism, we proposed a practical magnetic field sensor as well as an alternating spin current generator. We also investigated the spin torques arising from the SOC effects in various linear SOC systems, graphene and topological insulator systems, and their influence on the electron spin dynamics. The effective field and spin torque are calculated via the gauge theoretic method in the adiabatic limit. Finally, their effects on the spin dynamics are incorporated as an additional torque term in the well-established Landau-Lifshitz-Gilbert equation.
URI: http://scholarbank.nus.edu.sg/handle/10635/47373
Appears in Collections:Ph.D Theses (Open)

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