In giant magnetoresistance (GMR) or tunneling magnetoresistance (TMR) materials,
the transport properties rely on the related spin configurations, i.e., the
parallel spin configuration in both magnetic layers is responsible for the lower resistivity
state while the antiparallel spin configuration between them exhibit the
higher resistivity state. However, the magnetic materials in realistic do not align
completely in one direction; they exhibit magnetic domains to reduce the dipolar
interaction instead. It is thus crucial to investigate in detailed about how the
magnetic domain evolution influences the magnetoresistance in GMR or TMR
materials. So, Photoemission Electron Microscopy (PEEM) and Kerr microscope
are very good tools for us to study the magnetic domain in local area.
The in-situ preparation Mn/Ag wedge/Fe(100) ultrathin films are measured
by Auger electron spectroscopy (AES), low energy electron diffraction (LEED),
medium energy electron diffraction (MEED), and photoemission electron microscope
(PEEM) in an ultrahigh vacuum chamber.
The preparation Ti/Fe/Ti/SiO2/Si(100) thin films are performed in an ultrahigh
vacuum chamber and then are measured by Kerr Microscopy in air.
By observing the evolution of magnetic domain, we can know more the detailed
information on magnetism microscopically and the correlation between the
magnetic properties and electric transport properties.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0902108-173750 |
| Date | 02 September 2008 |
| Creators | Wu, Chien-Wen |
| Contributors | Der-Hsin Wei, Wen-Chin Lin, Chien-Cheng Kuo |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0902108-173750 |
| Rights | withheld, Copyright information available at source archive |
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