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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/65268


    Title: 氧化程度對銅與氧化亞銅奈米顆粒自發磁性的影響
    Authors: 許帛倉;Hsu,Po-tsang
    Contributors: 物理學系
    Keywords: 奈米顆粒;;氧化亞銅;自旋極化;飽和磁化強度;nanoparticles;Cu;Cu2O;spin polarization
    Date: 2014-07-16
    Issue Date: 2014-10-15 14:48:06 (UTC+8)
    Publisher: 國立中央大學
    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。
    ;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.
    Appears in Collections:[物理研究所] 博碩士論文

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