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Simulated lifetime of magnons and short wavelength distortion of magnons in bcc iron and fcc cobalt
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
2013 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The topic of this report is in electron spin dynamics where simulations where made using the UppASD simulations software based on the Landau-Lifshits-Gilbert equation. When many spins act together they form a wavelike movement called a magnon.  It is believed that the magnon can be used as information carrier in next generation of technology. We found that the lifetime of magnons in zero Kelvin in bcc iron and fcc cobalt decreases with higher damping and with smaller simulated structures for magnons with the same wavelength as the structure. Magnons with shorter wavelength than the structure are unstable and restructures itself to form a magnon of the same size as the structure. In a structure with a temperature, magnons with short wavelengths can exist at many energy levels. The short wavelength distortion was measured to increase linearly with higher temperature and linearly with higher damping for bcc iron and fcc cobalt.

Place, publisher, year, edition, pages
2013.
Series
TVE, 13007
Keyword [en]
magnon
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-202488OAI: oai:DiVA.org:uu-202488DiVA: diva2:632069
Educational program
Master Programme in Engineering Physics
Supervisors
Examiners
Available from: 2013-06-26 Created: 2013-06-24 Last updated: 2013-06-26Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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