Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/79518
Title: Study of microwave-assisted magnetization dynamics in magnetic films and structures
Authors: VELLEYUR NOTT SIDDHARTH RAO
Keywords: spintronics, magnetic recording, MAMR, microwave-assisted reversal, nanoscale devices, ferromagnetic resonance
Issue Date: 20-Jan-2014
Source: VELLEYUR NOTT SIDDHARTH RAO (2014-01-20). Study of microwave-assisted magnetization dynamics in magnetic films and structures. ScholarBank@NUS Repository.
Abstract: Microwave-assisted magnetization reversal (MAMR) has been suggested as an alternative recording scheme to extend areal densities in hard disk drives beyond 1 Tb/in<sup>2</sup>. In this thesis, microwave-assisted magnetization dynamics have been characterized in different spatial regimes by electrical and optical techniques to understand their influence on reversal processes. Time-resolved optical techniques have been developed to study spin wave generation in large area patterned thin films and the interaction of different modes. The study revealed the influence of pattern geometry on the spin wave modes and their interference patterns at different distances. Additionally, MAMR has also been investigated in individual elements by X-ray microscopy techniques to temporally and spatially map the spin wave contribution to the reversal mechanism. The study showed that spin waves are the dominant driving mechanism of reversal in small elements. Finally, a novel electrical characterization technique for MAMR using the spin-pumping phenomenon is demonstrated.
URI: http://scholarbank.nus.edu.sg/handle/10635/79518
Appears in Collections:Ph.D Theses (Open)

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