Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/32485
Title: AC magnetotransport, magnetocaloric and multiferroic studies in selected oxides
Authors: VINAYAK BHARAT NAIK
Keywords: Multiferroic materials, Magnetocaloric materials, Giant magnetoimpedance, Magnetoabsorption, Magnetic refrigeration, Magnetization dynamics
Issue Date: 19-Aug-2011
Source: VINAYAK BHARAT NAIK (2011-08-19). AC magnetotransport, magnetocaloric and multiferroic studies in selected oxides. ScholarBank@NUS Repository.
Abstract: In this thesis, the rf magnetoabsorption, ac magnetotransport, magnetocaloric and multiferroic properties of selected Mn-based (manganites) and Fe-based (ferrites) oxides have been investigated in detail. It is demonstrated that a simple IC oscillator circuit is a versatile contactless experimental tool to study magnetization dynamics as well as to investigate magnetostructural phase transition in manganites. Studies on ac magnetotransport in manganites using impedance spectroscopy revealed that ac magnetotransport is an alternative strategy to enhance ac magnetoresistance in manganites and also a valuable tool to study magnetization dynamics, and to detect magnetic and structural transitions. Studies of magnetocaloric effect in selected manganites showed coexistence of both normal and inverse magnetocaloric effects (MCEs) in a single compound with excellent magnetocaloric properties which may be very promising for magnetic refrigeration technology. A clear experimental evidence for both normal and inverse MCEs is obtained from the home-built differential scanning calorimetry (DSC) and differential thermal analysis (DTA) techniques. Detailed magnetic and magnetoelectric studies on pure and cation doped Bi1-xAxFeO3 compounds revealed interesting properties. We discuss the possible origins of observed effects.
URI: http://scholarbank.nus.edu.sg/handle/10635/32485
Appears in Collections:Ph.D Theses (Open)

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