銅氧核殼奈米顆粒間交互作用對自旋極化之影響

以作者查詢圖書館館藏

、以作者查詢臺灣博碩士

、以作者查詢全國書目

、勘誤回報

、線上人數：29

、訪客IP：3.129.216.30

姓名

陳乃維(Nai-Wei Chen) 查詢紙本館藏

畢業系所

物理學系

論文名稱

銅氧核殼奈米顆粒間交互作用對自旋極化之影響
(Effects of interparticle interaction on spin-polarized Cu/O core-shell nanoparticles)

相關論文

★ 銦錫鐵氧化物稀釋磁性半導體與微粒薄膜之研究	★ 高溫超導銪-釔-銅-氧化合物的磁有序及磁鬆弛探討
★ 矽材質之正本負感光二極體的製程與量測	★ 鑭-鈰-鈣-錳超巨磁阻氧化物的結構與磁有序特性探討
★ 鋰離子電池材料鋰-鎳-氧化合物的結構與磁性研究	★ 鋰離子電池材料鋰-錳-鈷氧化物之結構與磁性研究
★ 雜摻鐠與鑭之鐠-鋇-銅氧化合物對結構與磁性的研究與探討	★ 奈米粉粒的熱縮效應
★ 零維奈米鉛粉粒超導偶合強度與粒徑關係探討	★ 利用X光繞射峰形探討奈米粉末的粒徑分佈
★ 零維奈米鉛粉粒超導磁穿透深度與粒徑關係探討	★ 以比熱實驗探討奈米微粒的量子能隙
★ 奈米金粉粒的原子結構及吸收光譜與粒徑關係探討	★ 921斷層泥中奈米礦物微粒的探尋與滑動時地層溫度標定
★ 鐠系與鉍系龐磁阻材料結構、電性、磁性間的互動關係研究	★ Ag/PbO奈米複合材料的電子傳輸與異常磁阻探討

檔案

[Endnote RIS 格式]

[Bibtex 格式]

[相關文章]

[文章引用]

[完整記錄]

[館藏目錄]

[檢視]

[下載]

本電子論文使用權限為同意立即開放。
已達開放權限電子全文僅授權使用者為學術研究之目的，進行個人非營利性質之檢索、閱讀、列印。
請遵守中華民國著作權法之相關規定，切勿任意重製、散佈、改作、轉貼、播送，以免觸法。

摘要(中)

使用低真空熱蒸鍍冷凝製程獲得樣品Cu0518，透過結構精算軟體分析的X光繞射圖、EDS及XRF得到成分為銅及氧組成，帶有極少的鎢，成分比Cu 69.2%、Cu2O 30.8%。使用共同體積函數及積分寬法分析X光繞射圖與SEM影像統計定義樣品粒徑，配合成份比例得到核心粒徑 13.7nm、殼層厚度2.4 nm的銅氧核殼奈米顆粒。
使用本實驗室物理特性量測系統對Cu/Cu2O奈米顆粒做磁性量測，觀察到抗磁性及兩個磁分量三者共存的磁特性，兩磁分量分別為核心銅及殼層氧化亞銅的自旋極化現象，於55K附近存在特異磁性，在變溫磁化強度量測上出現隨溫度變化的峰形，於峰形存在的溫度區間，磁化曲線觀察到與反鐵磁性物質類似的峰腰型磁滯。而核心銅的磁分量在磁場1T便達飽和，殼層氧化亞銅的磁分量則須更高磁場才達飽和，並在溫度高於40K之後便消失。
進一步透過壓合樣品調控顆粒間距，觀察奈米顆粒間的交互作用。發現兩個磁分量在間距小於5 nm受到磁偶矩-磁偶矩交互作用影響而飽和磁化強度減少，而特異磁性存於變溫磁化強度的峰形在核心間距小於5 nm時明顯轉弱。而Cu/Cu2O奈米顆粒的抗磁性受交互作用影響，呈現隨顆粒間距三次方增加關係。

摘要(英)

The sample Cu0518 was fabricated by the thermal evaporation method. EDS, XRF, SEM and XRD patterns were used to characterize the sample. The analysis show that the Cu/Cu2O mole ratio are 7/3, with a 13.7 nm Cu core and a 2.4 nm Cu2O shell.
The magnetic properties of Cu/Cu2O nanoparticle was investigated by magnetization and ac magnetic susceptibility measurements. Two magnetic components and a diamagnetic one were observed, which were attributed to the spin polarization of Cu core, spin polarization of Cu2O shell, and diamagnetic responses. Hysteresis loop in M(H) and an anomaly in M(T) were found at around 55K. The analysis of M-H curve show that the Cu component saturated at 1T while the Cu2O component requires a higher applied magnetic field for saturation. No contribution from Cu2O was found above 40K.
Interparticle interaction becomes dominated when the average particle separation is smaller than 5 nm, which result in a reduction in saturation magnetization. The relation between average particle separation and diamagnetism can be described by the cubic law.

關鍵字(中)

★ 核殼
★ 銅
★ 奈米顆粒
★ 自旋極化
★ 交互作用

關鍵字(英)

★ nanoparticle
★ spin polarization
★ core shell
★ interaction

論文目次

摘要..........................................................Ⅰ
Abstract.......................................................Ⅱ
致謝.........................................................Ⅲ
目錄..........................................................Ⅳ
圖目..........................................................Ⅴ
表目..........................................................Ⅵ
第一章導論
1-1 銅與氧化亞銅之磁性..................................1
1-2 奈米貴金屬之新穎磁性................................3
第二章樣品備製及儀器介紹
2-1 樣品備製............................................8
2-2 實驗儀器介紹.......................................11
2-3 成份分析...........................................16
2-4 粒徑分析...........................................21
2-5 顆粒間距調控與估算.................................27
第三章 Cu/Cu2O奈米顆粒磁性分析
3-1 奈米顆粒之自旋極化現象.............................30
3-2 朗之萬順磁理論.....................................31
3-3 Cu/Cu2O奈米顆粒的磁特徵曲線........................33
3-4 磁化曲線的擬合與探討...............................37
3-5 磁化強度隨溫度的變化...............................44
第四章調控顆粒間距之磁性分析
4-1 顆粒間距對磁化曲線的影響...........................47
4-2 顆粒間交互作用探討.................................60
第五章結論 ..................................................65
參考文獻......................................................66

參考文獻

[1] Charles Kittel, Introduction to Solid State Physics ( eighth edition )
[2] Soshin Chikazumi著、張煦、李學養合譯，磁性物理學
[3] 傅僑文，核殼結構的奈米Cu/Cu2O微粒之自旋極化與弱鐵磁現象，中央大學碩士論文(2007)
[4] 吳勝允、李文獻，奈米銀微粒的非線性磁激發，物理雙月刊28卷五期 p.820 (2006)
[5] H. Hori, T. Teranishi, Y. Nakae, Y. Seino, M. Miyake, and S. Yamada, Phys. Lett. A 263, 406 (1999)
[6] H. Hori, Y. Yamamoto, T. Iwamoto, T. Miura, T. Teranishi, and M. Miyake, Phys. Rev. B 69, 174411 (2004)
[7] 許樹恩，吳泰伯，X光繞射原理與材料結構分析，初版，民全書局(1993)
[8] 王進威，擬合X光繞射峰形判定奈米微粒粉末的粒徑分佈，中央大學碩士論文(2006)
[9] 陳書偉，粒子間交互作用對奈米錫自旋極化的增益效應，中央大學碩士論文(2007)
[10] Jung Hyeun Kim and Sheryl H. Ehrman Applied Physics Letters 84 (8), 1278–1280 (2004)
[11] G. M. Pastor, J. Dorantes-Dávila, and K. A.Bennemann, Phys. Rev. B 40, 7642 (1989).
[12] J. Jing, X. Yang, Y. Hsia, and U. Gonser, Surf. Sci. 233, 351 (1990).
[13] V. Sahni and K.-P. Bohnen, “Exchange charge density at metallic surfaces,” Phys. Rev. B 29, 1045 (1984)
[14] V. Sahni and K.-P. Bohnen, “Image charge at a metal surface,” Phys. Rev. B 31, 7651 (1985)
[15] Manoj K. Harbola and Viraht Sahni, “Sturcture of the Fermi hole at surfaces,” Phys. Rev. B 37, 745 (1988)
[16] Steen Mørup and Cathrine Frandsen, “Thermoinduced Magnetization in Nanoparticles of Antiferromagnetic Materials,” Phys. Rev. Lett 92, 217201 (2004)
[17] R. Caudillo, X. Gao, R. Escudero, M. José-Yacaman, and J. B. Goodenough, PRB 74, 214418 (2006)
[18] C. Petit, A. Taleb, and M. P. Pileni, “Cobalt Nanosized Particles Organized in a 2D Superlattice: Synthesis, Characterization, and Magnetic Properties,” J. Phys. Chem. B 103, 1805 (1999)
[19] V. Russier, “Calculated magnetic properties of two-dimensional arrays of nanoparticles at vanishing temperature,” J Appl. Phys. 89, 1287 (2001)
[20] V. Russier, C. Petit, J. Legrand, and M. P. Pileni, “Collective magnetic properties of cobalt nanocrystals self-assembled in a hexagonal network: Theoretical model supported by experiments,” Phys. Rev. B 62, 3910 (2000)
[21] Jesús Garcia-Otero, Markus Porto, José Rivas, and Armin Bunde, “Influence of Dipolar Interaction on Magnetic Properties of Ultrafine Ferromagnetic Particles,” Phys. Rev. Lett 84, 167 (2000)
[22] Neil W.Ashcroft and N.David Mermin, “Solid State Physics”, P673

指導教授

李文献(Wen-Hsien Li)

審核日期

2008-7-1

推文