| DC 欄位 |
值 |
語言 |
| DC.contributor | 物理學系 | zh_TW |
| DC.creator | 許帛倉 | zh_TW |
| DC.creator | Po-tsang Hsu | en_US |
| dc.date.accessioned | 2014-7-16T07:39:07Z | |
| dc.date.available | 2014-7-16T07:39:07Z | |
| dc.date.issued | 2014 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:444/thesis/view_etd.asp?URN=101222036 | |
| dc.contributor.department | 物理學系 | zh_TW |
| DC.description | 國立中央大學 | zh_TW |
| DC.description | National Central University | en_US |
| dc.description.abstract | 本實驗是用低真空熱蒸鍍法製成銅奈米微粒，在一般環境下加熱氧化成氧化亞銅。樣品根據氧化程度命名為Cu20130316 O0 ~ O4。經由 X 光繞射實驗與結構精算軟體得知樣品詳細成分和晶體結構，判斷樣品Cu20130316 O0為純銅。利用共同體積函數、積分寬法、AFM等方法得到銅與氧化亞銅的粒徑大小，並推測樣品為剝落模型。
使用物理特性量測系統測量樣品Cu20130316 O0 ~ O4在不同溫度下的磁化曲線，並利用朗之萬函數、布里淵函數、反磁項進行擬合。在低溫下出現自旋極化現象，而在高於1kOe後，則是由黎曼效應所主導。
銅及氧化亞銅的自旋極化飽和磁化強度隨著溫度增加，並沒有明顯的改變，表示鐵磁自旋波與自旋極化磁矩並沒有太大的關係。
| zh_TW |
| dc.description.abstract | The Cu nanoparticles were fabricated by thermal evaporation method, and oxidized into Cu2O phase by a heating plate at atmosphere condition. The samples were named Cu20130316 O0 ~O4, according to the oxidation condition of the sample. The crystallographic composition of the sample and the corresponding lattice constants are obtained from X-ray diffraction pattern which is refined by General Structure Analysis System. The mean particle diameters of O0 ~O4 are determined by XRD peak profiles and AFM images.
Magnetization and magnetic ac susceptibility were measured by Physical Property Measurement System. The M-H curves of Cu20130316 O0 ~O4 can be described by a Langevin function, a Brillouin function, and a diamagnetic term. At low applied magnetic field regime the M-H curves of five samples reveal spin polarization effect, whereas Zeeman magnetization becomes predominantly at magnetic field larger than 1 kOe.
The saturation magnetization curves Ms of Cu and Cu2O nanoparticles do not change with temperature, indicating the ferromagnetic spin wave excitation does not come into play with polarized magnetic spins.
| en_US |
| DC.subject | 奈米顆粒 | zh_TW |
| DC.subject | 銅 | zh_TW |
| DC.subject | 氧化亞銅 | zh_TW |
| DC.subject | 自旋極化 | zh_TW |
| DC.subject | 飽和磁化強度 | zh_TW |
| DC.subject | nanoparticles | en_US |
| DC.subject | Cu | en_US |
| DC.subject | Cu2O | en_US |
| DC.subject | spin polarization | en_US |
| DC.title | 氧化程度對銅與氧化亞銅奈米顆粒自發磁性的影響 | zh_TW |
| dc.language.iso | zh-TW | zh-TW |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |