NOVEL APPROACHES FOR MANIPULATION OF MAGNETIZATION IN SPINTRONIC APPLICATIONS

Abstract

Some obstacles in the data retention mechanisms in magnetism are addressed, and a number of methods for manipulation of spin in different contexts has been developed. Utilizing excitation of collective modes with microwave irradiation or microwave modulated spin-polarized currents for selective manipulation of magnetization in magnetic nanodot matrices, in the context of hard disk technology (also magnonic crystals) and magnetic random access memories is explored. A synchronization method for spin-Hall oscillators is developed. An ultrafast all-optical switching mechanism combining the concepts of spin-orbit interaction and diffusive transport is demonstrated. Lastly, a novel perspective for manipulation of spin wave propagation is used to cloak magnons with introducing transformation magnonics, paving the way for novel switching mechansims. Each of the chapters in the body of the thesis contains a proposal for a novel mechanism, followed by theoretical and/or numerical proof of concept and analysis for the effects of important system parameters.