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Title: Multiferroic properties of Mn doped La0.8Bi0.2FeO3 system and effect of SHI irradiation
Researcher: Ghazala Anjum
Guide(s): Shafikuddin Mollah
Keywords: Physics
Upload Date: 12-Nov-2013
University: Aligarh Muslim University
Completed Date: 2011
Abstract: Multiferroics, defined for those multifunctional materials in which two or more kinds of fundamental ferroicities (ferroelectricity, ferromagnetism, antiferromagnetism and/or ferroelasticity) coexist, have become one of the hottest topics of condensed matter physics and materials science in recent years. This thesis describes the research work performed by me in last few years as a Ph.D research scholar. Magnetic and ferroelectric materials pervade almost every aspect of contemporary science and technology. Although ferroelectricity and magnetism have been the focus of condensed matter physics/material science since their discovery, quite a number of challenges have emerged in dealing with multiferroicity within the framework of fundamental physics and technological applications. Nevertheless, simple approaches do allow ferroelectricity and magnetism in one system, but may not necessarily offer strong magneto-electric coupling, partially because the microscopic mechanisms responsible for ferroelectricity (d0 orbitals) and magnetism (partially filled d orbitals) are physically very different. There are, in principle, two basic issues to address in order to make multiferroicity physically understandable. The first is the coexistence of electric dipole order and spin order in one system. The second is an efficient magneto-capacitive coupling between the two orders in a multiferroic system which seems to be even more important than their coexistence. This is because such a magneto-electric coupling represents the basis for multi-control of the two orders by either an electric field or a magnetic field. Investigations have demonstrated that a realization of such strong coupling is even more challenging and thus, the core of recent multiferroic researches. However, these types of material are very few in nature or synthesized in laboratory. Syntheses of such type of materials mostly lead to a mixture of the main phase along with other impurity phases which is another demanding assignment.
Pagination: 156p.
Appears in Departments:Department of Physics

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01_title.pdfAttached File76.7 kBAdobe PDFView/Open
02_certificate.pdf256.41 kBAdobe PDFView/Open
03_dedication.pdf100.89 kBAdobe PDFView/Open
04_acknowledgements.pdf64.12 kBAdobe PDFView/Open
05_preface.pdf542.18 kBAdobe PDFView/Open
06_contents.pdf647.65 kBAdobe PDFView/Open
07_abstract.pdf683.26 kBAdobe PDFView/Open
08_chapter 1.pdf1.17 MBAdobe PDFView/Open
09_chapter 2.pdf1.68 MBAdobe PDFView/Open
10_chapter 3.pdf1.06 MBAdobe PDFView/Open
11_chapter 4.pdf2.93 MBAdobe PDFView/Open
12_chapter 5.pdf1.75 MBAdobe PDFView/Open
13_chapter 6.pdf1.98 MBAdobe PDFView/Open
14_chapter 7.pdf2.47 MBAdobe PDFView/Open
15_chapter 8.pdf879.52 kBAdobe PDFView/Open

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