Magnetic excitations of finite systems: edge effects on spin waves

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dc.contributor.author Beairsto, Seamus
dc.date.accessioned 2020-09-26T03:02:56Z
dc.date.available 2020-09-26T03:02:56Z
dc.date.copyright 2020 en_US
dc.date.issued 2020-09-25
dc.identifier.uri http://hdl.handle.net/1828/12148
dc.description.abstract This thesis explores finite-size effects on the spin-wave excitations of one-dimensional ferromagnetic and antiferromagnetic systems. Specifically, it presents a theoretical study of the scattering function, the physical observable in inelastic neutron and photon scattering experiments, under the influence of extra magnetic anisotropy energy localized at the system’s boundaries. The method for calculating spin wave scattering functions in bulk is adapted to the finite system case, enabling explicit numerical calculations with edge effects. Our results show a significant broadening of the scattering peaks of low energy spin waves in ferromagnetic and antiferromagnetic systems. We show that broadening is due to the emergence of spin excitations localized at the edge of the system, the so-called edge modes. en_US
dc.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.subject Nanoparticles en_US
dc.subject Spin Waves en_US
dc.subject Finite Systems en_US
dc.subject Edge Anisotropy en_US
dc.title Magnetic excitations of finite systems: edge effects on spin waves en_US
dc.type Thesis en_US
dc.contributor.supervisor De Sousa, Rogério Costa Reis
dc.degree.department Department of Physics and Astronomy en_US
dc.degree.level Master of Science M.Sc. en_US
dc.description.scholarlevel Graduate en_US

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