Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/150304
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dc.titleMAGNETISM AND SPIN TRANSPORT AT THE INTERFACE OF FERROELECTRIC AND FERROMAGNETIC MATERIALS
dc.contributor.authorANDY PAUL CHEN
dc.date.accessioned2018-12-31T18:00:26Z
dc.date.available2018-12-31T18:00:26Z
dc.date.issued2018-08-03
dc.identifier.citationANDY PAUL CHEN (2018-08-03). MAGNETISM AND SPIN TRANSPORT AT THE INTERFACE OF FERROELECTRIC AND FERROMAGNETIC MATERIALS. ScholarBank@NUS Repository.
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/150304
dc.description.abstractRecent advances in memory technology has been driven by emerging memory architectures, especially magnetic tunnel junctions. In this work, physical effects in fabrication and MTJ operation are explored by first principles calculations. We find that carbon dopant atoms form interstitial defects at the CoFe/MgO interface upon annealing although its impact on tunnelling magnetoresistance is lesser in comparison to boron. Using an interface model for Co<sub>x</sub>Fe<sub>1-x</sub>MgO, we predicted that minimum magnetic damping happens at x = 35%, closer to observation than seen in earlier calculations. We determined that the strong perpendicular magnetisation of Pt/Fe<sub>2</sub>CoSi multilayers originates from orthorhombic distortion of Fe<sub>2</sub>CoSi and the formation of the Pt/Fe<sub>2</sub>CoSi interface. Lastly, we find that ferroelectric polarization control of magnetocrystalline anisotropy in CoFe/BaTiO<sub>3</sub> is achieved through modulated orbital hybridization across the interface. Interestingly, a 5<i>d</i> metal capping layer is shown to change the magnetocrystalline anisotropy drastically and strengthen ferroelectric polarization control of magnetocrystalline anisotropy.
dc.language.isoen
dc.subjectMagnetism, thin films, material interfaces, multiferroic materials, first principles calculations, magnetic tunnel junctions
dc.typeThesis
dc.contributor.departmentDEAN'S OFFICE (NGS FOR INTGR SCI & ENGG)
dc.contributor.supervisorFENG YUAN PING
dc.contributor.supervisorCHEN JINGSHENG
dc.description.degreePh.D
dc.description.degreeconferredDOCTOR OF PHILOSOPHY
dc.identifier.orcid0000-0002-7441-1174
Appears in Collections:Ph.D Theses (Open)

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