Magnetization Damping in Microstructured Ferromagnetic Materials

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dc.contributor.authorZhang, Lei
dc.contributor.supervisorChoi, Byoung-Chul
dc.date.accessioned2013-07-23T17:56:38Z
dc.date.available2013-07-23T17:56:38Z
dc.date.copyright2013en_US
dc.date.issued2013-07-23
dc.degree.departmentDepartment of Physics and Astronomy
dc.degree.levelMaster of Science M.Sc.en_US
dc.description.abstractThe magnetization damping properties of square permalloy elements were characterized. These 20 nm-thick permalloy squares were deposited by the electron beam evaporation. Time resolved magneto-optic Kerr effect microscopy (TR-MOKE) was used to measure the magnetization evolution in the sample. By curve fitting in Matlab, I obtained the value of damping constant that is consistent with the reference paper. A Landau confi guration in the square permalloy sample leads to the different trends of the damping constant with external bias field. The damping constant in the bottom domain is found to decrease with increasing bias field while the damping constant in the top domain has been saturated into the minimum value. The decreasing tendency of magnetization precession frequencies is consistent with the Kittel equation modi fied with an anisotropic energy term. Additionally, FePt thin films and patterned CoFeB disks were investigated but neither yielded conclusive dynamic data.en_US
dc.description.proquestcode0611en_US
dc.description.proquestcode0607en_US
dc.description.proquestcode0752en_US
dc.description.proquestemailleizhang.summer@gmail.comen_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/4702
dc.languageEnglisheng
dc.language.isoenen_US
dc.rights.tempAvailable to the World Wide Weben_US
dc.subjectMagnetization Dampingen_US
dc.subjectMicrostructured Ferromagnetic Materialsen_US
dc.subjectTR-MOKEen_US
dc.titleMagnetization Damping in Microstructured Ferromagnetic Materialsen_US
dc.typeThesisen_US

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