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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林敏聰(Minn-Tsong Lin) | |
dc.contributor.author | Kui-Hon Ou Yang | en |
dc.contributor.author | 歐陽魁鴻 | zh_TW |
dc.date.accessioned | 2021-06-07T18:04:56Z | - |
dc.date.copyright | 2012-08-15 | |
dc.date.issued | 2012 | |
dc.date.submitted | 2012-07-27 | |
dc.identifier.citation | [1] The Nobel Prize in Physics 2007'. Nobelprize.org. n.d. Web. 17 May 2011.
[2] G. Binasch, P. Grnberg, F. Saurenbach, and W. Zinn. Enhanced magnetoresistance in layered magnetic structures with antiferromagnetic interlayer exchange'. Phys. Rev. B 39, 4828 (1989) [3] M. N. Baibich, J.M. Broto, A. Fert, F. Nguyen van Dau, F. Petro , P. Eitenne, G. Creuzet, A. Friederich, and J. Chazelas. Giant Magnetoresistance of (001)Fe/(001)Cr Magnetic Superlattices'. Phys. Rev. Lett. 61, 2472 (1988) [4] Smiths, Evan. Cost of Hard Drive Storage Space'. Ns1758.ca. Nova Scotia's Electric Gleaner. n.d. Web. 17 May 2011. [5] Grochowski, E. et al. Hitachi-Hdd-Technology-2003'. Scribd.com n.d. PPT Web. 17 May 2011. [6] Moore, G. E. Cramming more components onto integrated circuits'. Electronics 38, 8 (1965) [7] Excerpts from A Conversation with Gordon Moore: Moore's Law'. Intel.com 2005. PDF Web. 28 Jun 2011. [8] Walter, C. Kryder's Law'. Scienti c American. 25 Jul 1965. [9] Moodera, J. S. et al.. Large Magnetoresistance at Room Temperature in Ferromagnetic Thin Film Tunnel Junctions'. Phys. Rev. Lett. 74, 3273-3276 (1995) 59 [10] Wolf, S. A. et al.. Spintronics: a spin-based electronics vision for the future'. Science 294, 1488-1495 (2001) [11] Xiong, Z. H. et al.. Giant magnetoresistance in organic spin-valves'. Nature 427, 821-824 (2004) [12] Krinichnyi, V. I. 2-mm waveband electron paramagnetic resonance spectroscopy of conducting polymers'. Synth. Met. 108, 173-222 (2000) [13] Vollhardt, K., Schore, N. Organic Chemistry: Structure and Function'. New York: W. H. Freeman And Company, 2002. 4th. [14] IUPAC. Compendium of Chemical Terminology, 2nd ed. (the `Gold Book') '. Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scienti c Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook. [15] Nabok, A. Organic And Inorganic Nanostructures'. Boston: Artech House Publishers, 2005. 2nd. [16] Li, Kai-Shin et al.. Organic spin valves with inelastic tunneling characteristics'. Phys. Rev. B 83, 172404 (2011) [17] JhenYong Hong, K. H. Ou Yang, B. Y. Wang, K. S. Li, H. W. Hsiu, C. H. Chen, Y. L. Chen, D. H. Wei, F. H. Chang, H. J. Lin, and MinnTsong Lin, to be submitted [18] Huang, Z. H. Master Thesis: The e ects of growth and annealing temperature on the magnetoresistance in PTCDA-based spin valves'. (2010) [19] Kittel, C. Introduction to Solid State Physics'. Hoboken: John Wiley & Sons, Inc., 2005. 8th. [20] Jean, Y., Volatron, F. An Introduction To Molecular Orbitals'. New York: Oxford University Press, Inc., 1993. 60 [21] Resources, synchrotron radiation'. NSRRC.org.tw National Synchrotron Radiation Research Center. n.d. Web. 17 May 2011. [22] Chuang, C. H. Ph.D. Thesis: Electronic Structures and Chemical Modifications of Nano-material Systems: Carbon Nanotubes, Graphene, and Metal Oxide Materials'. (2009) [23] Moulder, J. F. et al.. Handbook of X Ray Photoelectron Spectroscopy'. Eden Prairie: Handbook of X Ray Photoelectron Spectroscopy, 1993. [24] `BL09A1`'. NSRRC.org.tw National Synchrotron Radiation Research Center. n.d. Web. 17 May 2011. [25] Yoon, Won-Sub et al.. Combined NMR and XAS Study on Local Environments and Electronic Structures of Electrochemically Li-Ion Deintercalated Li1xCo1=3Ni1=3Mn1=3O2 Electrode System'. Electrochem. Solid-State Lett. 7, A53-A55 (2004) [26] Steinmuller, S. J. et al.. E ect of substrate roughness on the magnetic properties of thin fcc Co lms'. Phys. Rev. B 76, 054429 (2007) 61 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/16204 | - |
dc.description.abstract | 摘要�
我們嘗試針對苝四甲酸二酐(PTCDA)蒸鍍於不同的材料基板上的 分子間排列整齊度以及電子結構進行實驗了解。 本實驗室先前成功的開發出以苝四甲酸二酐作為穿隧層的有機自旋閥 (spin-valve)(//FM/AlOx/PTCA/AlOx/FM),並在室溫下可有穩定的磁阻表現達12%。但此有機自旋閥的表現對氧化鋁 (AlOx)穿隧層有很強的依賴性,亦即若不在層狀結構中加入氧化鋁,則無法得到可工作的有機自旋閥。此研究的目的即在於嘗試著想要了解此氧化層所扮演的角色。在這個系統內有兩個可能的因素:苝四甲酸二酐的排列整齊度,與苝四甲酸二酐和磁性金屬間的電荷轉移現象所造成 的電子結構改變。 首先我們進行了偏振入射解析X光吸收光譜術 (polarizationdependence X-ray absorption spectroscopy)量測,並確認了苝四甲酸二酐分子不論是在鈷或氧化鋁層上都是沿著較平行於底層基板的方向排列,甚至在苝四甲酸二酐上方再鍍了一層金屬鈷,情況也是一樣。這點也透過了角度解析X光吸收光譜 (angle-dependent X-ray absorption spectroscopy)量測更進一步的確認。 接下來我們進行了X光光電子能譜術 (X-ray photoelectron spectroscopy)量測,確認了在沒有氧化鋁的情況下,苝四甲酸二酐在醚基 (ether)上的氧將會與下方基底的金屬鈷發生電子作用,造成該氧原子化學環境的改變。這點也在羰基 (carbonyl) 上的碳訊號得到確認:在沒有氧化鋁夾層的情況下,羰基上的碳原子訊號也會相對變弱。 我們的研究成果顯示,氧化鋁在這個系統中的角色並非影響了苝四甲酸二酐的分子間排列狀況,而是在於防止苝四甲酸二酐分子與金屬鈷之間的電荷轉移。 | zh_TW |
dc.description.abstract | We have done polarization-dependent X-ray absorption spectroscopy (XAS), angle-resolved XAS, and X-ray photoelectron spectroscopy (XPS) to probe the interfaces between PTCDA and 2 di erent materials, Co and AlOx, in order to figure out the reason on the dependence of AlOx layer in the organic spin-valve with the structure of //FM/AlOx/PTCDA/AlOx/FM, as suggested and studied by our previous
group members. There are two candidates, the intramolecular { overlapping, due to intramolecular orientations of PTCDA, and/or the possibility to have di erent electronic structures of either the PTCDA molecule or the FM layer underneath, for with or without the AlOx layer. First we did the measurement of the polarization-dependent XAS. We con firmed that the molecular orientation of PTCDA showed some specific orientation, much more parallel to the surface of the underlying substrate, no matter to be either AlOx or Co layer. And this was also further con rmed by the angle-dependent XAS. Also, the deposition of another top Co capping layer onto the PTCDA layer would merely react the structure of the PTCDA molecules. Secondly, XPS was performed. The data showed that the oxygen atoms of the ether group tends to vanish for the PTCDA molecules deposited on bare Co, accordance to the comparison with the molecules deposited on the AlOx layer. The data suggests while the PTCDA molecules would all have the same molecular orientation on either AlOx, Co, or even with another Co capping layer on the top of PTCDA layer, their electronic structures are di erent. The AlOx seems to have the ability to prevent the charge-transfer (the formation of chemical bonds), and this may be correlated to the dependance of the AlOx layer in OSVs. More studies have to be carried out for further confirmation. | en |
dc.description.provenance | Made available in DSpace on 2021-06-07T18:04:56Z (GMT). No. of bitstreams: 1 ntu-101-R97245006-1.pdf: 5569120 bytes, checksum: 15f29c8ded712794e76cacc60c589916 (MD5) Previous issue date: 2012 | en |
dc.description.tableofcontents | Contents
Abstract ii Scientic Acknowledgements iii 1 Introduction and Motivation 1 1.1 Brief History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Applying the Organic Materials into Spintronics . . . . . . . . . . . . 2 1.2.1 The Orbital . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2.2 The Conjugated Systems and The Delocalization of Electrons 8 1.3 The Organic Spin Valve . . . . . . . . . . . . . . . . . . . . . . . . . 10 2 Experimental Apparatus and Techniques 14 2.1 Ultrahigh Vacuum (UHV) system . . . . . . . . . . . . . . . . . . . . 14 2.1.1 The Magnetron Sputtering system and TMR chamber in Nano- Magnetism Lab . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.1.2 The Thermal Evaporation Systems and Organic-Load-Lock Chamber in NSRRC . . . . . . . . . . . . . . . . . . . . . . . 21 2.2 National Synchrotron Radiation Research Center . . . . . . . . . . . 25 2.2.1 Angle Resolved X-ray Absorption Spectroscopy (XAS) . . . . 28 2.2.2 X-ray Photoelectron Spectroscopy (XPS) . . . . . . . . . . . . 32 3 Molecular Orientation 33 3.1 PTCDA molecules perform a more nearly-inplane geometry { Polarization- Dependent XAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 3.1.1 //Py/Co/AlOx/PTCDA . . . . . . . . . . . . . . . . . . . . . 36 3.1.2 //Py/Co/PTCDA . . . . . . . . . . . . . . . . . . . . . . . . 38 3.2 The around-10° contact angle of PTCDA molecules on various substrates { Angle-Resolved XAS . . . . . . . . . . . . . . . . . . . . . . 40 3.2.1 ex-situ //Py/Co/AlOx/PTCDA . . . . . . . . . . . . . . . . . 41 3.2.2 ex-situ //Py/Co/AlOx/PTCDA + top capping Co . . . . . . 43 3.2.3 ex-situ //Py/Co/PTCDA . . . . . . . . . . . . . . . . . . . . 45 3.2.4 in-situ //Py/Co/PTCDA . . . . . . . . . . . . . . . . . . . . 47 3.3 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 4 Electronic Structure 50 4.1 The reduction of the oxygen on ether { Oxygen 1s XPS . . . . . . . . 51 4.2 The reduction of the carbonyl carbon { Carbon1s XPS . . . . . . . . 52 4.3 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 5 Conclusion 55 | |
dc.language.iso | en | |
dc.title | 有機自旋閥的磁阻效能與介面性質關連之研究 | zh_TW |
dc.title | The correlation between the interfacial properties and the magnetoresistance performances in organic spin valves | en |
dc.type | Thesis | |
dc.date.schoolyear | 100-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 魏德新(Der-Hsin Wei),陳家浩(Chia-Hao Chen) | |
dc.subject.keyword | 有機自旋閥,自旋電子學,同步輻射,苝,四甲酸二酐, | zh_TW |
dc.subject.keyword | organic spin valves,spintronics,synchrotron radiation research,PTCDA, | en |
dc.relation.page | 61 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2012-07-27 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 應用物理所 | zh_TW |
顯示於系所單位: | 應用物理研究所 |
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