奈米銦粉末樣品之粒徑分佈對分析自旋極化現象的影響

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/48226

Title:	奈米銦粉末樣品之粒徑分佈對分析自旋極化現象的影響
Authors:	林元菩;Yuan-Pu Lin
Contributors:	物理研究所
Keywords:	粒徑分佈;自旋極化;奈米銦;nanoparticle;Indium;multi-dispersed
Date:	2011-07-18
Issue Date:	2012-01-05 14:41:59 (UTC+8)
Abstract:	我們首先用熱蒸鍍法，做出本實驗用的樣品In100418，並使用X 光繞射儀得到樣品的繞射譜圖，接著使用GSAS 精算軟體進行成分分析，以積分寬法、共同體積函數法及原子力顯微鏡進行樣品之粒徑分析。接著，我們的實驗是將14nm 左右的銦粉末，放入膠囊，慢慢壓縮膠囊之體積，改變樣品的壓合密度。每一組壓合密度，皆藉由物理特性量測系統(ppms)，量測好幾組溫度之M-H 圖。這次我們將顆粒粒徑分佈對顆粒磁矩的影響，考慮進M-H 圖的擬合方程中，並探討此方法(multi-dispersed 擬合法)的必要性，以及對造此方法的到的自旋極化參數與過去只用單一顆粒磁矩的擬合函數法(mono-dispersed 擬合法)所得到的自旋級化參數，做分析與比較。發現了幾個現象: 1. 此樣品之顆粒磁矩大小隨溫度增加而上升 2. 此樣品之飽和磁化強度隨溫度增加而下降 3. 此實驗中Multi-dispersed 擬合法得到的顆粒磁矩會比 mono-dispersed 擬合法所得到的顆粒磁矩小很多 At fast ,we made the sample that called In100418 by thermal evaporation method. We used X-ray diffract meter to get the spectra of diffraction by the sample, then we use the GSAS software to get the components of the sample.And we get the size of the sample by X-ray and AFM. We put the sample into the capsule, and change the packing fraction of the sample, then measured the magnetic properties by ppms. We get the M-H curve. Now, we considering the effect about particle moment that depend on particle size, we use new function to fit M-H curve, called multi-dispersed fitting method. And we use the method to argue the phenomenon of spin polarization . We find some phenomenon: 1. For the sample, μp increased with temperature 2. For the sample, Ms decreased with temperature 3. The μp by multi-dispersed method is much smaller then the μp by mono-dispersed method
Appears in Collections:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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