(18.210.12.229) 您好!臺灣時間:2021/02/26 09:27
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果

詳目顯示:::

我願授權國圖
: 
twitterline
研究生:陳思瑋
研究生(外文):Szu-Wei Chen
論文名稱:利用自旋偏極化穿隧電子掃瞄顯微鏡與能譜解析鈷奈米島嶼在銅(111)上的磁性量子限制與相互作用
論文名稱(外文):Magnetic Quantum Confinement Effect and Interaction ofCo Nanoislands on Cu(111) Resolved by Spin-PolarizedScanning Tunneling Microscopy and Spectroscopy
指導教授:林敏聰林敏聰引用關係
指導教授(外文):Minn-Tsong Lin
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:物理研究所
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2010
畢業學年度:98
語文別:英文
論文頁數:51
中文關鍵詞:鈷奈米島嶼自旋偏極化穿隧電子掃瞄顯微鏡磁偶極力量子限制
外文關鍵詞:Co nanoislandsspin polarizedscanning tunneling microscopydipolar interacionquantum confinement
相關次數:
  • 被引用被引用:0
  • 點閱點閱:122
  • 評分評分:系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
三角鈷奈米島嶼在銅(111)上的堆積行為與垂直平面的磁化方向在此篇論文中被研究,由於量子限制,利用電子穿隧掃描顯微鏡可以解析在這個系統下的電子干涉模型與表面電子能態偏移,我們可以利用自由電子的駐波態去模擬實驗下的電子干涉模型,並驗證利用非自旋偏極化的穿隧電子掃瞄顯微鏡亦可解析出磁性的駐波模型。此外,我們發現到某些相連的鈷島嶼的自旋呈現反向平行,從我們的統計與計算,我們認為磁偶極矩足夠與鐵磁性藕和競爭並保持鈷奈米島嶼呈現自旋反向平行的情況。

The stacking behaviors and out of plane magnetization of bilayer triangular Co nanoislands on Cu(111) were studied. Due to quantum confinement, the interference patterns and surface state shift can be resolved in this system by scanning tunneling microscopy and spectroscopy. We used the free electron model to fit the interference patterns with experimental data, and we discovered that the magnetic standing wave patterns can also be resolved by non spin-polarized STM. Furthermore, we observed some conjoint Co islands with anti-parallel spin alignment. From our statistical result and calculation, we deduced that dipolar interaction is strong enough to compete with ferromagnetic coupling to preserve the anti-parallel spin alignment in two conjoint Co nanoislands.

Abstract iii
1 Introduction 1
2 Basic Concept 4
2.1 Magnetic Interaction . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1.1 Exchange Coupling . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1.2 Dipole-Dipole Interaction . . . . . . . . . . . . . . . . . . . . 6
3 Experimental Apparatus 7
3.1 Ultrahigh Vacuum (UHV) System . . . . . . . . . . . . . . . . . . . . 7
3.1.1 Sputter Gun and Anneal Device . . . . . . . . . . . . . . . . . 7
3.1.2 Molecular Beam Epitaxy(MBE) . . . . . . . . . . . . . . . . . 9
3.2 Low Energy Electron Diffraction . . . . . . . . . . . . . . . . . . . . . 10
3.2.1 LEED principle . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.2 IV LEED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Cylindrical Mirror Analyzer (CMA) . . . . . . . . . . . . . . . . . . . 11
3.4 Scanning Tunneling Microscopy / Spectroscopy (STM / STS) . . . . 13
3.4.1 Scanning Tunneling Microscopy (STM) . . . . . . . . . . . . . 13
3.4.2 Scanning Tunneling Spectroscopy (STS) . . . . . . . . . . . . 15
3.5 Spin-polarized STM / STS . . . . . . . . . . . . . . . . . . . . . . . . 17
3.6 Preparation of Magnetic Tip . . . . . . . . . . . . . . . . . . . . . . . 19
4 Structure and Electronic Properties of Co Nanoislands on Cu(111) 21
4.1 CMA, LEED and LEED IV of Cu(111) . . . . . . . . . . . . . . . . . 21
4.2 Morphology of Co Nanoislands and Cu surface . . . . . . . . . . . . . 22
4.3 STS of Co nanoislands and Cu(111) . . . . . . . . . . . . . . . . . . . 26
5 Quantum Confinement effect and SP-STM of Co Nanoislands on
Cu(111) 29
5.1 Size-Dependent Surface States . . . . . . . . . . . . . . . . . . . . . . 29
5.2 Spin-Polarized STM of Co on Cu(111) . . . . . . . . . . . . . . . . . 30
6 Discussion 34
6.1 Quantum Interference . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.1.1 Fitting The Standing Wave Patterns of SP-STS and STS image 34
6.2 Magnetic Interactions between Two Conjoint Nanoislands . . . . . . . 40
6.2.1 Two Conjoint Types . . . . . . . . . . . . . . . . . . . . . . . 40
6.2.2 Statistical Results . . . . . . . . . . . . . . . . . . . . . . . . . 41
7 Conclusions 47
7.1 Resolving Magnetic Standing Wave Patterns by Non Spin-Polarized
STM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.2 Dipolar Interaction Preserving The Antiparallel Spin Alignment . . . 48
Bibliography 49


[1] Ouchi K. and Iwasaki S., IEEE Trans. Mag. 23, 180 (1987).
[2] U. Gradmann and J. Muller, Z. Angew. Phys. 30, 87 (1970).
[3] R. Hammerling, C. Uiberacker, J. Zabloudil, and P. Weinberger, Phys. Rev.
B 66, 052402 (2002).
[4] A. L. Vazquez de Parga, F. J. Garcia-Vidal, and R. Miranda, Phys. Rev. Lett.
13, 4365 (2000).
[5] N. N. Negulyaev, V. S. Stepanyuk, P. Bruno, L. Diekhoner, P. Wahl, and K.
Kern, Phys. Rev. B 77, 125437 (2008).
[6] M. T. Kief and W. F. Egelhoff, Jr. , Phys. Rev. B 47, 10785 (1993).
[7] M. Wasniowska, W. Wulfhekel, M. Przybylski, and J. Kirschner, Phys. Rev.
B 78, 035405 (2008).
[8] L. Diekhoner, M. A. Schneider, A. N. Baranov, V. S. Stepanyuk, P. Bruno,
and K. Kern, Phys. Rev. Lett. 90 236801 (2003).
[9] M. V. Rastei, B. Heinrich, L. Limot, P. A. Ignatiev, V. S. Stepanyuk, P. Bruno,
and J. P. Bucher, Phys. Rev. Lett. 99, 246102 (2007).
[10] O. Pietzsch, A. Kubetzka, M. Bode, and R. Wiesendanger, Phys. Rev. Lett.
92, 057202 (2004).
[11] O. Pietzsch, S. Okatov, A. Kubetzka, M. Bode, S. Heinze, A. Lichtenstein,
and R. Wiesendanger, Phys. Rev. Lett. 96, 237203 (2006).
[12] H. Oka, P. A. Ignatiev, S. Wedekind, G. Rodary, L. Niebergall, V. S. Stepanyuk,
D. Sander, J. Kirschner, Science 327, 843 (2010).
[13] David Jiles, Introduction to Magnetism and Magnetic Materials, 249 (1991).
[14] R. Skomski, Europhysics Letters, 48, 455 (1999).
[15] F.Huang, M. T. Kief, G. J. Mankey, and R. F. Willis, Phys. Rev. B 49, 3962
(1994).
[16] Wen-Chin Lin, Zheng Gai, Lan Gao, Jian Shen, Pin-Jui Hsu, Hong-Yu Yen,
and Minn-Tsong Lin, Phys. Rev. B 80, 024407 (2009).
[17] Focko Meier, Lihui Zhou, Jens Wiebe, Roland Wiesendanger, Science 320, 82
(2008).
[18] O. Pietzsch, A. Kubetzka, M. bode, and R. Wiesendanger, Phys. Rev. Lett.
84, 5212 (2000).
[19] J. Hauschild, U. Gradmann, H. J. Elmers, Appl. Phys. Lett. 72, 3211 (1998).
[20] C. Iacovita, M.V. Rastei, B.W. Heinrich, T. Brumme, J. Kortus, L. Limot,
and J. P. Bucher, Phys. Rev. Lett. 101, 116602 (2008).
[21] Chii-Bin Wu, Pin-Jui Hsu, Hong-Yu Yen and Minn-Tsong Lin, Appl. Phys.
Lett. 91, 202507 (2007).
[22] Pin-Jui Hsu, Chun-I Lu, Szu-Wei Chen, Wang-Jung Hsueh, Yu-Hsun Chu,
Chuang-Han Hsu, Christopher John Bulter and Minn-Tsong Lin, Appl. Phys.
Lett. 96, 142515 (2010).
[23] M. Julliere, Phys. Lett. A 54A, 225 (1975).
[24] D. Wortmann, S. Heinze, Ph. Kurz, G. Bihlmayer, and S. Blugel, Phys. Rev.
Lett. 86, 4132 (2001).
[25] Charles Kittel, Introduction to Solid State Physics (8th ed.) (John Wiley and
Sons, Inc, USA, 2005).
[26] G. Binnig, H. Rohrer, Ch. Gerber and E. Weibel, Physica(Utrecht) 107B+C,
1335 (1981), Proceedings of the Sixteenth International Conference on Low-
Temperature physics, Los Angeles, 19-25 August 1981 and Appl. Phys. Lett.
40, 178 (1982).
[27] J. Tersoff and D. R. Hamann, Phys. Rev. Lett. 50, 1998 (1983).
[28] Roland Wiesendanger, Reviews of Modern Physics 81, 1495 (2009).
[29] M. Farle, B.Mirwald-Schulz, A. N. Anisimov, W. Platow, and K. Baberschke,
Phys. Rev. B 55, 3708 (1997).
[30] R. Wiesendanger, H. J. Guntherodt, G. Guntherodt, R. J. Gambino and R.
Ruf, Phys. Rev. Lett. 65, 247 (1990).
[31] M. F. Crommie, C. P. Lutz and D. M. Eigler, Nature 363, 524 (1993).
[32] L. Niebergall, V. S. Stepanyuk, J. Berakdar, and P. Bruno, Phys. Rev. Lett.
96, 127204 2006.
[33] A. V. Rozhkov and Franco Nori, Phys. Rev. B 81, 155401 2010.
[34] X.F. Cui, M. Zhao, Q. Jiang, Thin Solid Films 472, 328 (2005).

QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
無相關論文
 
系統版面圖檔 系統版面圖檔