Power deposition in ferromagnetic implants of cylindrical and spherical shape from an externally applied uniform time harmonic radio-frequency magnetic field has been investigated by means of quasi-static analysis. Inductive heating efficiency is related to the relative permeability and temperature dependence of permeability can be exploited to limit the maximum temperature rise to the desired value by proper choice of Curie point of ferromagnetic material. It is found that theoretically calculated power absorption versus orientation of the cylindrical implant with the direction of magnetic field is in good agreement with the experimental results. The parametric studies are based on a two-dimensional finite difference model for calculating temperature distribution in perfused tissues due to induction heating of an array of implants. An approximate analytical model was developed for a large regular array of implants in perfused tissues. The results of the analytical model are compared with those of the numerical model. (Abstract shortened with permission of author.)

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The 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. / Graduate / 0611 / 0607 / 0752 / leizhang.summer@gmail.com

Thesis (Ph. D.)--University of Missouri-Columbia, 2007. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on March 4, 2008) Vita. Includes bibliographical references.

Thesis (Ph. D.)--University of Texas at Austin, 2007. / Vita. Includes bibliographical references.

Thesis (Ph.D.) -- McMaster University, 1997. / Includes bibliographical references (leaves 149-152). Also available via World Wide Web.

Thesis (Ph. D.)--Michigan State University. Dept. of Physics and Astronomy, 2008. / Title from PDF t.p. (viewed on July 23, 2009) Includes bibliographical references (p. 50-52). Also issued in print.

Thesis (M.S.)--Oregon State University, 2010. / Printout. Includes bibliographical references (leaves 51-53). Also available on the World Wide Web.

Thesis (Ph. D.)--University of California, San Diego, 2000. / Vita. Includes bibliographical references.

Thesis (M. S.)--Materials Science and Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Garmestani, Hamid; Committee Member: Gall, Ken; Committee Member: Thadhani, Naresh.