SYNTHESIS OF SAMARIUM-TITANIUM-IRON AND NEODYMIUM-IRON-BORON MAGNETIC FILMS WITH SPECIAL ANISOTROPIES.
Item
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Title
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SYNTHESIS OF SAMARIUM-TITANIUM-IRON AND NEODYMIUM-IRON-BORON MAGNETIC FILMS WITH SPECIAL ANISOTROPIES.
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Identifier
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AAI8629752
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identifier
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8629752
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Creator
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WICKRAMASEKARA, LEE.
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Contributor
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Fred J. Cadieu
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Date
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1986
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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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Rare earth-transition metal film magnets of Nd-Fe-B and several new phases of Sm-Ti-Fe system have been synthesised by special sputtering methods to utilize the high magnetic anisotropies of these alloys. The magnetic properties of these film magnets were observed to be strongly dependent on the film textures. Thus, by varying the sputtering conditions we were able to synthesize films with crystal textures which gives rise to special anisotropies. Crystalline films of Sm(FeTi)(,2) and SmCo(,3) were synthesized with large perpendicular anisotropy of 10('6) erg/cc, whereas (SmTi)Fe(,5) and Sm(,2)(FeCoZr)(,17) were synthesized with inplane anisotropy and static energy product of 20 MG-Oe. The Nd(,2)Fe(,14)B film system is unique due to the fact that it can be synthesized with large perpendicular anisotropy of 1.5 x 10('7) erg/cc with 9 kG remanent and 16 kOe coercive force or inplane anisotropy with 16 MG-Oe static energy product by controlling the sputtering rate. In addition, SmCo(,5), (SmTi)Fe(,5), and Sm(,2)(FeCoZr)(,17) film systems were synthesized in amorphous states in the presence of inplane magnetic field of 2.5 kOe and exhibited large uniaxial inplane anisotropy of 10('6) erg/cc. In particular, upon annealing from the amorphous state in the same magnetic field, the SmCo(,5) phase exhibited a coercive force larger than 22 kOe and its moment could not be rotated within the film plane with a 22 kOe external field, thus increasing the uniaxial inplane anisotropy constant to at least 10('7) erg/cc.
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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
