SAMARIUM-COBALT BASED FERROMAGNETIC FILMS SYNTHESIZED DIRECTLY BY RF SPUTTERING.
Item
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Title
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SAMARIUM-COBALT BASED FERROMAGNETIC FILMS SYNTHESIZED DIRECTLY BY RF SPUTTERING.
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Identifier
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AAI8508685
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identifier
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8508685
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Creator
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ALY, SAMY H.
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Contributor
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F. J. Cadieu
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Date
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1985
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Language
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English
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Publisher
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City University of New York.
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Subject
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Physics, Condensed Matter
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Abstract
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The light rare earth intermetallic ferromagnetic compounds exhibit both high saturation moment and high crystal anisotropy energy. Also, they have high critical temperature for magnetic ordering. These properties made them excellent candidates as permanent magnet materials.;The purpose of this work is to study the magnetic properties of ferromagnetic films of the Sm-Co based system. The films are synthesized by selectively thermalized RF sputtering onto heated substrates without any further heat treatment for promoting their magnetic properties.;In the first chapter we review the basic mechanisms responsible for the outstanding properties of these materials. The second chapter deals with the experimental procedures for synthesis of the ferromagnetic films by RF sputtering. The effects of different sputtering parameters on the films' physical and microstructural properties are discussed.;In the third chapter the method of x-ray energy dispersive fluorescence analysis used to study the composition of our films is presented. The fourth chapter covers the x-ray diffraction techniques used to study the crystal structure of the films, to determine the grain size and the states of preferred orientations of certain crystal planes developed in the films.;In the fifth and last chapter we present our results and discuss them on the light of the previous chapters. Magnetization, coercive forces, and energy products of the films as obtained from hysteresis loop measurements are discussed. In addition, a tentative model of the possible magnetization reversal processes in our films is suggested. A discussion of the preferred textures exhibited by these films closes the chapter.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Physics
