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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 林敏聰(Minn-Tsong Lin) | |
| dc.contributor.author | Sheng-Yueh Weng | en |
| dc.contributor.author | 翁聖岳 | zh_TW |
| dc.date.accessioned | 2021-06-08T03:35:15Z | - |
| dc.date.copyright | 2019-08-13 | |
| dc.date.issued | 2019 | |
| dc.date.submitted | 2019-07-31 | |
| dc.identifier.citation | [1] Devkota, J., Geng, R., Subedi, R. C., & Nguyen, T. D. (2016), Organic spin valves: a review. Advanced Functional Materials, 26(22), 3881-3898
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/21478 | - |
| dc.description.abstract | 在自旋電子學中，自旋在儲存設備的控制以及偵測資訊中扮演著很重要的角色。利用導電電子以及磁子傳輸的純自旋流在金屬以及非有機材料中被廣泛地研究，但在因其弱自旋軌道耦合 (spin-orbit coupling) 而被預測有長自旋擴散長度 (spin diffusion length) 和自旋鬆弛時間 (spin relaxation time) 的有機材料中卻還沒被研究透徹。在π共軛有機半導體 (π-conjugated organic semiconductor) 中，電荷載子是藉由跳躍傳導 (hopping transport) 的但是自旋傳輸性質卻還尚未清楚。在這系列的實驗中，我們用自旋幫浦 (spin pumping effect) 和自旋賽貝克效應 (spin Seebeck effect) 這兩種機制來產生純自旋流 (pure spin current) ，並將其注入至π共軛有機半導體苝四甲酸二酐 (PTCDA) 中展示其中的自旋傳輸現象。藉由比較這兩種自旋注入實驗，我們發現其自旋流穿透深度的不同，並認為純自旋流的產生機制還有自旋流來源和能障間的介面是十分重要的。變溫自旋賽貝克效應實驗暗示孔洞效應似乎在能障太薄的時候會產生巨大的影響，但當其足夠厚實自旋流則可以流入能障苝四甲酸二酐。 | zh_TW |
| dc.description.abstract | In spintronics, spin transport plays an important role in controlling and detecting information in storage devices. Pure spin current, carried by conduction electrons or magnons, have been investigated in a wide range of metals and inorganic semiconductors but rarely in organic materials, which have been predicted to have the long spin diffusion length and spin relaxation time due to its low spin-orbit coupling which is caused by low atomic number of composing atoms.
It has been reasoned that charge carriers in π-conjugated organic semiconductor transport by hopping but the spin transport property is not clear yet. Here we used two kinds of sources, spin pumping and the spin Seebeck effect, to inject pure spin currents into π-conjugated organic semiconductors PTCDA and demonstrate the spin transport inside. By comparing these two kinds of spin injections, we conclude that the generation mechanisms of pure spin current and the interface between source and barrier are both important since the resulting penetration lengths of spin current are different between the two methods. Temperature-dependent spin Seebeck effect measurements have also been performed and imply the pinhole issue would cause a serious impact if the thickness of PTCDA is excessively thin but spin current would flow through organic materials when PTCDA is thick enough. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-08T03:35:15Z (GMT). No. of bitstreams: 1 ntu-108-R04245016-1.pdf: 10075833 bytes, checksum: 609dee001c0185f3779c69822e7190be (MD5) Previous issue date: 2019 | en |
| dc.description.tableofcontents | Abstract iii
Declaration iv Acknowledgements v 1 Introduction 1 2 Fundamentals 3 2.1 Spin Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Spin Hall Effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 Ferromagnetic Resonance . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3.1 Landau-Lifshitz-Gilbert equation . . . . . . . . . . . . . . . . 8 2.4 Spin Pumping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.5 Longitudinal Spin Seebeck Effect . . . . . . . . . . . . . . . . . . . . 15 3 Apparatus 17 3.1 Physical Vapor Deposition System . . . . . . . . . . . . . . . . . . . 17 3.1.1 Multi-Target Magnetron Co-Sputtering System . . . . . . . . 20 3.1.2 Thermal Evaporation Chamber . . . . . . . . . . . . . . . . . 21 3.2 Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.2.1 Electron Paramagnetic Resonance System . . . . . . . . . . . 22 3.2.2 Spin Seebeck Effect . . . . . . . . . . . . . . . . . . . . . . . . 23 4 Spin Current Injection 25 4.1 Spin Pumping in Pt/ PTCDA/ Py systems . . . . . . . . . . . . . . . 25 4.1.1 Sample Preparation . . . . . . . . . . . . . . . . . . . . . . . . 25 4.1.2 Signal Analyzation . . . . . . . . . . . . . . . . . . . . . . . . 26 4.1.3 Power-Dependent Measurements . . . . . . . . . . . . . . . . . 28 4.1.4 Angular Dependent Measurements . . . . . . . . . . . . . . . 29 4.1.5 Thickness-Dependent Measurements . . . . . . . . . . . . . . 31 4.2 Spin Seebeck Effect in YIG/ PTCDA/ Pt Systems . . . . . . . . . . . 34 4.2.1 Sample Fabrication . . . . . . . . . . . . . . . . . . . . . . . . 34 4.2.2 Experimental Data of the SSE Measurements . . . . . . . . . 35 4.3 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 5 Conclusions 42 Appendix 44 A Coplanar Waveguide 44 Bibliography 47 | |
| dc.language.iso | en | |
| dc.title | 藉由自旋幫浦效應和自旋賽貝克效應研究在有機半導體苝四甲酸二酐中的自旋注入以及傳輸性質 | zh_TW |
| dc.title | Investigate Spin Injection and Transport Properties in Organic Semiconductor PTCDA by Spin Pumping and Spin Seebeck Effect | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 107-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 林秀豪(Hsiu-Hau Lin),黃斯衍(Ssu-Yen Huang),江文中(Wen-Chung Chiang),張景皓(Ching-Hao Chang) | |
| dc.subject.keyword | 自旋幫浦,自旋賽貝克效應,共軛有機半導體,?四甲酸二酐,自旋注入,自旋傳輸, | zh_TW |
| dc.subject.keyword | Spin pumping,spin Seebeck effect,π-conjugated organic semiconductor,PTCDA,spin injection,spin transport, | en |
| dc.relation.page | 55 | |
| dc.identifier.doi | 10.6342/NTU201902001 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2019-07-31 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 應用物理研究所 | zh_TW |
| 顯示於系所單位： | 應用物理研究所 | |
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