Giant Magnetoresistance of Silver Nickel Iron Grandular Magnetic Thin Films Prepared by RF Magnetron Sputtering System

The discovery of giant magnetoresistance (GMR) in multilayer system and subsequently in granular films has stimulated world wide research activities, due to both its fundamental significance and its potential application to magnetic sensors and data storage. Hence, this work is carried out to inv...

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Main Author:	Lim, Kean Pah
Format:	Thesis
Language:	English English
Published:	1998
Subjects:	Thin films - Magnetic properties Magnetoresistance
Online Access:	http://psasir.upm.edu.my/id/eprint/9114/1/FPP_1998_79_A.pdf
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id	my-upm-ir.9114
record_format	uketd_dc
spelling	my-upm-ir.91142011-01-06T07:58:07Z Giant Magnetoresistance of Silver Nickel Iron Grandular Magnetic Thin Films Prepared by RF Magnetron Sputtering System 1998-07 Lim, Kean Pah The discovery of giant magnetoresistance (GMR) in multilayer system and subsequently in granular films has stimulated world wide research activities, due to both its fundamental significance and its potential application to magnetic sensors and data storage. Hence, this work is carried out to investigate this phenomenon. The first part of the work is to find out the suitable parameter and condition for producing good quality films. Granular magnetic thin films of Ag- Ni-Fe have been prepared at different deposition rates and compositions using RF Magnetron Sputtering system. Subsequently, the surfaces of the thin films were examined using the scanning electron microscope (SEM) and energy dispersive X-ray (EDX) analysis, also in the SEM, was used to determine the composition of the films. The crystalline state of the films was determined by X-ray diffraction using CuKa radiation in a 29 powder diffractometer and the resistances of the films were measured using a four-point probe method to calculate the GMR effect. Lastly, the data obtained were analysed to investigate and understand the electrical transport mechanism in thin films. The result shows that the GMR effect is thickness, structure and composition dependent. The highest GMR value was obtained for the samples deposited for 60 minutes with 25% of magnetic entities embedded in the non-magnetic matrix. The microstructure analysis shows that the highest GMR value was obtained if the formation of <111> fcc Ag texture is dominant and small grain size was formed in the film. In conclusion, a good granular thin film with high GMR value of 3.73% at room temperature has been developed and this result meets the requirement in the magnetic sensors and data storage industry. Thin films - Magnetic properties Magnetoresistance 1998-07 Thesis http://psasir.upm.edu.my/id/eprint/9114/ http://psasir.upm.edu.my/id/eprint/9114/1/FPP_1998_79_A.pdf application/pdf en public masters Universiti Putra Malaysia Thin films - Magnetic properties Magnetoresistance Faculty of Educational Studies English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Thin films - Magnetic properties Magnetoresistance
spellingShingle	Thin films - Magnetic properties Magnetoresistance Lim, Kean Pah Giant Magnetoresistance of Silver Nickel Iron Grandular Magnetic Thin Films Prepared by RF Magnetron Sputtering System
description	The discovery of giant magnetoresistance (GMR) in multilayer system and subsequently in granular films has stimulated world wide research activities, due to both its fundamental significance and its potential application to magnetic sensors and data storage. Hence, this work is carried out to investigate this phenomenon. The first part of the work is to find out the suitable parameter and condition for producing good quality films. Granular magnetic thin films of Ag- Ni-Fe have been prepared at different deposition rates and compositions using RF Magnetron Sputtering system. Subsequently, the surfaces of the thin films were examined using the scanning electron microscope (SEM) and energy dispersive X-ray (EDX) analysis, also in the SEM, was used to determine the composition of the films. The crystalline state of the films was determined by X-ray diffraction using CuKa radiation in a 29 powder diffractometer and the resistances of the films were measured using a four-point probe method to calculate the GMR effect. Lastly, the data obtained were analysed to investigate and understand the electrical transport mechanism in thin films. The result shows that the GMR effect is thickness, structure and composition dependent. The highest GMR value was obtained for the samples deposited for 60 minutes with 25% of magnetic entities embedded in the non-magnetic matrix. The microstructure analysis shows that the highest GMR value was obtained if the formation of <111> fcc Ag texture is dominant and small grain size was formed in the film. In conclusion, a good granular thin film with high GMR value of 3.73% at room temperature has been developed and this result meets the requirement in the magnetic sensors and data storage industry.
format	Thesis
qualification_level	Master's degree
author	Lim, Kean Pah
author_facet	Lim, Kean Pah
author_sort	Lim, Kean Pah
title	Giant Magnetoresistance of Silver Nickel Iron Grandular Magnetic Thin Films Prepared by RF Magnetron Sputtering System
title_short	Giant Magnetoresistance of Silver Nickel Iron Grandular Magnetic Thin Films Prepared by RF Magnetron Sputtering System
title_full	Giant Magnetoresistance of Silver Nickel Iron Grandular Magnetic Thin Films Prepared by RF Magnetron Sputtering System
title_fullStr	Giant Magnetoresistance of Silver Nickel Iron Grandular Magnetic Thin Films Prepared by RF Magnetron Sputtering System
title_full_unstemmed	Giant Magnetoresistance of Silver Nickel Iron Grandular Magnetic Thin Films Prepared by RF Magnetron Sputtering System
title_sort	giant magnetoresistance of silver nickel iron grandular magnetic thin films prepared by rf magnetron sputtering system
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Educational Studies
publishDate	1998
url	http://psasir.upm.edu.my/id/eprint/9114/1/FPP_1998_79_A.pdf
_version_	1747810903557931008

Giant Magnetoresistance of Silver Nickel Iron Grandular Magnetic Thin Films Prepared by RF Magnetron Sputtering System

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