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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| Format: | Thesis |
| Language: | English English |
| Published: |
1998
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/9114/1/FPP_1998_79_A.pdf |
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| Summary: | 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. |
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