The properties of Complex impedance in high frequency on La0.67Ca0.33MnO3 oxide
碩士 === 國立高雄師範大學 === 物理學系 === 97 === In this paper, studying in the high-frequency properties of La0.67Ca0.33MnO3/STO(001) thin film by using impedance measurement. The different thickness of thin film has a regular transformation in impedance spectra. Grain size of LCMO(4min) thin film is the smalle...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2009
|
| Online Access: | http://ndltd.ncl.edu.tw/handle/d5jw9k |
| Summary: | 碩士 === 國立高雄師範大學 === 物理學系 === 97 === In this paper, studying in the high-frequency properties of La0.67Ca0.33MnO3/STO(001) thin film by using impedance measurement. The different thickness of thin film has a regular transformation in impedance spectra. Grain size of LCMO(4min) thin film is the smallest. It leads to increase grain boundary and relaxation time. And the relaxation time and DC resistance have the same of trend at temperature changed.
Grain size effect dielectric constant. Small grain size has high dielectric constant. At the transition temperature, dielectric constant and loss are the smallest. By relaxation time and dielectric properties, we realize the transition between of ferromagnetism and paramagnetism. Expect to the higher frequency, the more interesting thing can be found.
|
|---|