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dc.contributor.authorWu, Te-ho.*
dc.creatorWu, Te-ho.en_US
dc.date.accessioned2011-10-31T18:04:35Z
dc.date.available2011-10-31T18:04:35Z
dc.date.issued1993en_US
dc.identifier.urihttp://hdl.handle.net/10150/186291
dc.description.abstractThis dissertation contains a fairly comprehensive study on the characteristics of magneto-optical (MO) recording media. The primary aspects which are investigated consist of magnetic, magneto-optic, magneto-transport properties, and observations of domains. The main materials which have been examined are amorphous rare earth-transition metal (RE-TM) Tbₓ(FeCo)₁₋ₓ and multilayered Co/Pt and Co/Pd thin films. The samples were fabricated in several industrial and academic laboratories under different deposition conditions and deposited on different underlayers and substrates. The instrumentation used in this study include: a Vibrating Sample Magnetometer (VSM), a polar Kerr effect and extraordinary Hall effect loop tracer, an optical magnetic domain analyzer, and the magnetoresistance/resistivity probes. The magneto-optical property studied here is polar Kerr rotation. The magnetic properties investigated include saturation magnetization, coercivity, anisotropy energy constant, anisotropy field, and exchange coupling constant. The magneto-transport properties include resistivity, magnetoresistance and extraordinary Hall effect with four different geometries. In the domain observations, the domain nucleation, growth and collapse phenomena were investigated. In addition, the degree of jaggedness of various domain structures has been characterized by measuring the fractal dimension. Moreover, the domain distribution is analyzed in the demagnetized state both for the sample demagnetized by an in-plane magnetic field and the sample demagnetized by a perpendicular field. At the same time, both states were also studied in light of the initial magnetization curves obtained by measurements of polar Kerr effect, extraordinary Hall effect, and magnetoresistance. The domain density as a function of domain size as well as the minimum domain size can be inferred from the initial magnetization curves.
dc.language.isoenen_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.subjectDissertations, Academic.en_US
dc.subjectOptics.en_US
dc.subjectCondensed matter.en_US
dc.titleMagnetic, magneto-optic, and magneto-transport studies of thin film media of magneto-optical recording.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.contributor.chairMansuripur, Masuden_US
dc.contributor.chairMcIntyre, Laurence C.
dc.identifier.oclc717486279en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.leveldoctoralen_US
dc.contributor.committeememberFu, Hongen_US
dc.contributor.committeememberEngel, Braden_US
dc.contributor.committeememberBowen, Theodoreen_US
dc.contributor.committeememberJenkins, Edgaren_US
dc.identifier.proquest9328621en_US
thesis.degree.disciplinePhysicsen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.namePh.D.en_US
refterms.dateFOA2018-05-26T16:50:45Z
html.description.abstractThis dissertation contains a fairly comprehensive study on the characteristics of magneto-optical (MO) recording media. The primary aspects which are investigated consist of magnetic, magneto-optic, magneto-transport properties, and observations of domains. The main materials which have been examined are amorphous rare earth-transition metal (RE-TM) Tbₓ(FeCo)₁₋ₓ and multilayered Co/Pt and Co/Pd thin films. The samples were fabricated in several industrial and academic laboratories under different deposition conditions and deposited on different underlayers and substrates. The instrumentation used in this study include: a Vibrating Sample Magnetometer (VSM), a polar Kerr effect and extraordinary Hall effect loop tracer, an optical magnetic domain analyzer, and the magnetoresistance/resistivity probes. The magneto-optical property studied here is polar Kerr rotation. The magnetic properties investigated include saturation magnetization, coercivity, anisotropy energy constant, anisotropy field, and exchange coupling constant. The magneto-transport properties include resistivity, magnetoresistance and extraordinary Hall effect with four different geometries. In the domain observations, the domain nucleation, growth and collapse phenomena were investigated. In addition, the degree of jaggedness of various domain structures has been characterized by measuring the fractal dimension. Moreover, the domain distribution is analyzed in the demagnetized state both for the sample demagnetized by an in-plane magnetic field and the sample demagnetized by a perpendicular field. At the same time, both states were also studied in light of the initial magnetization curves obtained by measurements of polar Kerr effect, extraordinary Hall effect, and magnetoresistance. The domain density as a function of domain size as well as the minimum domain size can be inferred from the initial magnetization curves.


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