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Magnetoelastic properties of cobalt-...

Anapolsky, Abraham.

Magnetoelastic properties of cobalt-nickel thin films.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Magnetoelastic properties of cobalt-nickel thin films.
Author:	Anapolsky, Abraham.
Description:	98 p.
Notes:	Chair: Oscar D. Dubon.
Notes:	Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4768.
Contained By:	Dissertation Abstracts International65-09B.
Subject:	Engineering, Materials Science.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3146780
ISBN:	0496056794

Magnetoelastic properties of cobalt-nickel thin films.
Anapolsky, Abraham.

Magnetoelastic properties of cobalt-nickel thin films. - 98 p.

Chair: Oscar D. Dubon.

Thesis (Ph.D.)--University of California, Berkeley, 2004.

A thorough background in elastic and non-elastic mechanisms of deformation (in relation to magnetostriction) is discussed. These topics include a semi-classical treatment of magnetoelasticity, superelasticity, and martensitic transformations.

ISBN: 0496056794Subjects--Topical Terms:

226940
Engineering, Materials Science.

Magnetoelastic properties of cobalt-nickel thin films.
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100 0 $a Anapolsky, Abraham. $3 228055
245 1 0 $a Magnetoelastic properties of cobalt-nickel thin films.
300 $a 98 p.
500 $a Chair: Oscar D. Dubon.
500 $a Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4768.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2004.
520 # $a A thorough background in elastic and non-elastic mechanisms of deformation (in relation to magnetostriction) is discussed. These topics include a semi-classical treatment of magnetoelasticity, superelasticity, and martensitic transformations.
520 # $a An important result of this thesis is the complete magnetic and physical characterization for the entire range of Co-Ni thin films that undergo martensitic transformation. Extensive analysis of morphology, microstructure, phase, and magnetic data, developed a consistent picture of Co-Ni polycrystalline thin films in the composition range mentioned above.
520 # $a Another important result was the development of a novel technique for measuring the value of the magnetostriction coefficient in thin films. The in-plane component of magnetostriction ( lips ) is determined by fitting a theoretical model (based on the Stoner-Wohlforth theory for uniaxial systems) to magnetization vs temperature (M vs T) data for cobalt-nickel thin films. My theoretical model predicts the effect of an imposed stress (or strain) on the in-plane component of saturation magnetization ( Mips ). The imposed stress (or strain) is due to a mismatch in the coefficient of thermal expansion between the film and substrate. The fit is accomplished by using lips as a fitting parameter. M vs T experiments were carried out on a variety of polycrystalline Co-Ni thin films grown on silicon oxide and silicon nitride.
520 # $a Cobalt-nickel alloys show large values of magnetostriction, magnetocrystalline anisotropy, and a martensitic phase transformation at temperatures around 0 K. Collectively, these properties make Co-Ni alloys good candidates for the so-called giant magnetostrictive effect. Magnetostrictive (and giant magnetostrictive) alloys can be used to replace complex machinery (such as actuators) in micro-electromechanical systems (MEMS). For this reason, researchers have been investigating the magnetostrictive properties of thin films.
520 # $a I grew and characterized films in the composition range Co: 10 wt% Ni to Co: 35 wt% Ni. Films were grown by electron beam evaporation and a variety of techniques including SEM, TEM, x-ray diffraction, and SQUID magnetometry were used to characterize the films.
590 $a School code: 0028.
650 # 0 $a Engineering, Materials Science. $3 226940
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710 0 # $a University of California, Berkeley. $3 212474
773 0 # $g 65-09B. $t Dissertation Abstracts International
790 $a 0028
790 1 0 $a Dubon, Oscar D., $e advisor
791 $a Ph.D.
792 $a 2004
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