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Fabrication, characterization, and micromagnetic analysis of lithographically defined particle arrays for applications in data storage

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dc.contributor.advisor Caroline A. Ross. en_US
dc.contributor.author Hwang, Minha, 1973- en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. en_US
dc.date.accessioned 2005-08-23T20:16:24Z
dc.date.available 2005-08-23T20:16:24Z
dc.date.copyright 2001 en_US
dc.date.issued 2001 en_US
dc.identifier.uri http://hdl.handle.net/1721.1/8449
dc.description Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2001. en_US
dc.description Includes bibliographical references (leaves 101-103). en_US
dc.description.abstract In this thesis, the magnetic behavior of nanostructured ferromagnetic particle arrays are studied by experiments and numerical micromagnetics for ultra-high-density data storage applications. 1 00nm or 200nm period arrays of nanostructured nickel, cobalt, and cobalt phosphorus are fabricated by the techniques of interference lithography combined with evaporation and electrodeposition. The nanomagnet arrays are characterized by bulk magnetometry and magnetic force microscopy. The remanent states of evaporated conical particles and electrodeposited cylindrical particles are studied by micromagnetic simulations and compared with experimental measurements. For electrodeposited particles, the influence of size, aspect ratio and microstructure on switching field is also investigated. Finally, the effect of demagnetizing magnetostatic interactions and switching field spread on the squareness and the shape of hysteresis loops is studied with the help of an Ising-like interaction model. Based on these observations, a stability condition for patterned media is found and used for determining the optimum spacing between nanomagnets. en_US
dc.description.statementofresponsibility by Minha Hwang. en_US
dc.format.extent 103 leaves en_US
dc.format.extent 10354567 bytes
dc.format.extent 10354329 bytes
dc.format.mimetype application/pdf
dc.format.mimetype application/pdf
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.rights.uri http://dspace.mit.edu/handle/1721.1/7582
dc.subject Materials Science and Engineering. en_US
dc.title Fabrication, characterization, and micromagnetic analysis of lithographically defined particle arrays for applications in data storage en_US
dc.type Thesis en_US
dc.description.degree Ph.D. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. en_US
dc.identifier.oclc 50673208 en_US


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