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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 林敏聰(Minn-Tsong Lin) | |
| dc.contributor.author | Piin-Chen Yeh | en |
| dc.contributor.author | 葉品辰 | zh_TW |
| dc.date.accessioned | 2021-06-08T02:13:34Z | - |
| dc.date.copyright | 2016-02-15 | |
| dc.date.issued | 2015 | |
| dc.date.submitted | 2015-12-30 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/19689 | - |
| dc.description.abstract | 在這份研究中，我們主要觀察了以苝四甲酸二酐為中間層的有機自旋閥的電性和磁性表現。此結構中，介於苝四甲酸二酐有機層和上電極之間有一層部分氧化的氧化鋁，讓整個有機自旋閥呈現非對稱的結構。在電流─電壓的掃描量測中，可以觀察到曲線分裂成相異的兩路徑，此現象展現了此層狀結構具有二重電阻穩態。脈衝式電流的量測結果也顯示此元件也具應用為可變電阻式記憶體的潛力。藉由擬和電流─電壓曲線，推論電荷在此元件層狀結構間的傳導可能是具電荷擷取式的傳遞。此外，我們也對此元件進行穿隧磁阻和磁光克爾效應的量測。此非對稱的層狀結構元件結合了磁性和電阻式記憶體效應，具有可發展成為多功能記憶體的潛力。 | zh_TW |
| dc.description.abstract | In this study, we fabricate organic spin valves (OSVs) in sandwiched structure (//NiFe/CoFe/organic/AlOx/CoFe/) with a thin 3,4,9,10-perylene-tetracarboxylic dianhydride (PTCDA) layer as the organic spacer. The presence of the AlOx layer between PTCDA and the top ferromagnetic electrode makes the junction structure asymmetric. The splitting in I-V curve is observed and represents the bistable resistance states of these junctions. We present the resistance switching behavior of these devices by pulse-current measurement, and demonstrate its potential to be a resistance switching random access memory (RRAM) structure. By fitting of I-V curves, the mechanism of charge transport through these OSVs is proposed to be trap-dependent conduction. We also demonstrate its magnetic properties by magnetoresistance (MR) and magneto-optical Kerr effect (MOKE) measurements. These asymmetric OCVs, combining magnetic and resistance switching properties, could be candidates of multifunctional memory devices. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-08T02:13:34Z (GMT). No. of bitstreams: 1 ntu-104-R01222039-1.pdf: 7810277 bytes, checksum: e7240329c99c074c22ddc5e801e81d28 (MD5) Previous issue date: 2015 | en |
| dc.description.tableofcontents | 1 Introduction 1
2 Basic Concepts 4 2.1 Introduction of Magnetoresistance . . . . . . . . . . . . . . . . . . . . 4 2.1.1 Giant Magnetoresistance . . . . . . . . . . . . . . . . . . . . . 4 2.1.2 Tunneling Magnetoresistance and Jullière Model . . . . . . . . 7 2.2 Charge Transport in Organic Semiconductors . . . . . . . . . . . . . 10 2.2.1 Space-Charge-Limited Current . . . . . . . . . . . . . . . . . . 10 2.2.2 Injection-Limited Current . . . . . . . . . . . . . . . . . . . . 12 2.2.3 Simmon’s Formula . . . . . . . . . . . . . . . . . . . . . . . . 13 2.3 Resistive Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.3.1 Resistive Switching Modes: Unipolar and Bipolar . . . . . . . 16 2.3.2 Mechanisms of Resistive Switching . . . . . . . . . . . . . . . 18 3 Apparatus and Measurement 31 3.1 Fabrication Apparatus . . . . . . . . . . . . . . . . . . . . . . . . . . 31 3.1.1 Ultra High Vacuum System . . . . . . . . . . . . . . . . . . . 31 3.1.2 DC and RF Magnetron Sputtering . . . . . . . . . . . . . . . 33 3.1.3 Thermal Evaporation System . . . . . . . . . . . . . . . . . . 34 3.2 Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 3.2.1 Four-probe Resistance Measurement . . . . . . . . . . . . . . 36 3.2.2 Magneto-Optical Kerr Effect Measurement . . . . . . . . . . . 37 3.2.3 Pulse-current Measurement . . . . . . . . . . . . . . . . . . . 39 4 Results and Discussion 40 4.1 Sample Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 4.2 Electric Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 4.2.1 Current-Voltage Measurement . . . . . . . . . . . . . . . . . . 42 4.2.2 Fitting of Current-Voltage Curves . . . . . . . . . . . . . . . . 43 4.2.3 Temperature-Dependence of Resistance . . . . . . . . . . . . . 45 4.2.4 Pulse-Current Measurement . . . . . . . . . . . . . . . . . . . 46 4.3 Magnetic Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 4.3.1 MOKE Measurement . . . . . . . . . . . . . . . . . . . . . . . 48 4.4 Junctions without PTCDA Layers . . . . . . . . . . . . . . . . . . . . 49 4.4.1 Comparisons Between Junctions with and without PTCDA Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 4.4.2 Comparisons Between Different AlOx Thickness . . . . . . . . 50 4.4.3 Comparisons Between Different Degree of Oxidation . . . . . . 51 4.4.4 The MR Behaviors in LRS and in HRS . . . . . . . . . . . . . 53 4.5 Mechanism for the PTCDA-based System . . . . . . . . . . . . . . . 57 5 Conclusion 60 Bibliography 62 | |
| dc.language.iso | en | |
| dc.title | 苝四甲酸二酐有機自旋閥電阻轉換及磁性表現之研究 | zh_TW |
| dc.title | Resistive Switching and Magnetic Properties In PTCDA-Based Organic Spin Valves | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 104-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 江文中(Wen-C. Chiang),李愷信(Kai-Shin Li) | |
| dc.subject.keyword | 有機自旋閥,?四甲酸二酐,磁阻,電阻式記憶體效應,多功能記憶體, | zh_TW |
| dc.subject.keyword | Organic spin valve,PTCDA,Magnetoresistance,Resistance switching,Multifunctional memory device, | en |
| dc.relation.page | 67 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2015-12-30 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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