The effect of sample preparation parameters on magnetoresistance ratios (MR%) in CO/CU nanostructures
The research reported in this thesis is primarily aimed at establishing the fundamental understanding of magnetoresistance (MR) phenomena occurring in layered magnetic nanostructures of Co/Cu system fabricated using sputtering and electron beam method. Emphasis is given on the studies of magnetoresi...
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my-utm-ep.51482018-02-28T07:55:15Z The effect of sample preparation parameters on magnetoresistance ratios (MR%) in CO/CU nanostructures 2005-03 Lau, Yee Chen QC Physics The research reported in this thesis is primarily aimed at establishing the fundamental understanding of magnetoresistance (MR) phenomena occurring in layered magnetic nanostructures of Co/Cu system fabricated using sputtering and electron beam method. Emphasis is given on the studies of magnetoresistance ratios (MR%) as functions of Co layer thickness, working pressure, annealing time and temperature, number of bilayer, direction of magnetic fields, and the application of buffer layer. The Co/Cu/Co sandwiches in this study were fabricated on corning glass substrates. The electrical resistance of samples was measured using the four point Van der Pauw method when magnetic fields of ± 2500 gauss were applied. It was observed that, the MR% attained almost 10% between 2 - 6 nm of the Co layer thickness. By varying the working pressure, a maximum MR% of 11.4% was obtained at a working pressure of 2.6 x 10-3 torr. In the other hand, the MR% also increases with the increasing of annealing temperature and time. In the bilayers number, n various MR% was revealed by the existence of up-down fluctuations with the MR’s peak and valley occurring at n = 5 and n = 8, respectively. It was also observed that, the magnetic field applied in plane to the samples with and without chromium buffer layer produced higher value MR% of compared to those applied perpendicularly. Thus, the results indicate the dependent of MR% on various preparation parameters. 2005-03 Thesis http://eprints.utm.my/id/eprint/5148/ http://eprints.utm.my/id/eprint/5148/1/LauYeeChenMFS2005.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science |
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Universiti Teknologi Malaysia |
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UTM Institutional Repository |
| language |
English |
| topic |
QC Physics |
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QC Physics Lau, Yee Chen The effect of sample preparation parameters on magnetoresistance ratios (MR%) in CO/CU nanostructures |
| description |
The research reported in this thesis is primarily aimed at establishing the fundamental understanding of magnetoresistance (MR) phenomena occurring in layered magnetic nanostructures of Co/Cu system fabricated using sputtering and electron beam method. Emphasis is given on the studies of magnetoresistance ratios (MR%) as functions of Co layer thickness, working pressure, annealing time and temperature, number of bilayer, direction of magnetic fields, and the application of buffer layer. The Co/Cu/Co sandwiches in this study were fabricated on corning glass substrates. The electrical resistance of samples was measured using the four point Van der Pauw method when magnetic fields of ± 2500 gauss were applied. It was observed that, the MR% attained almost 10% between 2 - 6 nm of the Co layer thickness. By varying the working pressure, a maximum MR% of 11.4% was obtained at a working pressure of 2.6 x 10-3 torr. In the other hand, the MR% also increases with the increasing of annealing temperature and time. In the bilayers number, n various MR% was revealed by the existence of up-down fluctuations with the MR’s peak and valley occurring at n = 5 and n = 8, respectively. It was also observed that, the magnetic field applied in plane to the samples with and without chromium buffer layer produced higher value MR% of compared to those applied perpendicularly. Thus, the results indicate the dependent of MR% on various preparation parameters. |
| format |
Thesis |
| qualification_level |
Master's degree |
| author |
Lau, Yee Chen |
| author_facet |
Lau, Yee Chen |
| author_sort |
Lau, Yee Chen |
| title |
The effect of sample preparation parameters on magnetoresistance ratios (MR%) in CO/CU nanostructures |
| title_short |
The effect of sample preparation parameters on magnetoresistance ratios (MR%) in CO/CU nanostructures |
| title_full |
The effect of sample preparation parameters on magnetoresistance ratios (MR%) in CO/CU nanostructures |
| title_fullStr |
The effect of sample preparation parameters on magnetoresistance ratios (MR%) in CO/CU nanostructures |
| title_full_unstemmed |
The effect of sample preparation parameters on magnetoresistance ratios (MR%) in CO/CU nanostructures |
| title_sort |
effect of sample preparation parameters on magnetoresistance ratios (mr%) in co/cu nanostructures |
| granting_institution |
Universiti Teknologi Malaysia, Faculty of Science |
| granting_department |
Faculty of Science |
| publishDate |
2005 |
| url |
http://eprints.utm.my/id/eprint/5148/1/LauYeeChenMFS2005.pdf |
| _version_ |
1747814568075198464 |