請用此 Handle URI 來引用此文件：
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/24278完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 楊鴻昌 | |
| dc.contributor.author | Chiu-Hsien Wu | en |
| dc.contributor.author | 吳秋賢 | zh_TW |
| dc.date.accessioned | 2021-06-08T05:20:33Z | - |
| dc.date.copyright | 2005-07-29 | |
| dc.date.issued | 2005 | |
| dc.date.submitted | 2005-07-27 | |
| dc.identifier.citation | References:
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Gaines, Phys. Rev. B 45, 7574 (1992) | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/24278 | - |
| dc.description.abstract | 應用於生物磁場的高靈敏度超導量子干涉元件之製作與特性探討.
為了追求高重複性和高品質的元件,我們建立了一新的製作階梯方法. 利用兩步驟改善階梯品質.成功的將階梯製作達到最佳化.將階梯應用於串聯式超導量子干涉元件,我們發現雜訊隨著串連各數增加而降低.另外利用1公分的雙晶體我們製作出了高靈敏度的超導量子干涉元件.且利用我們創新的串聯式磁通水壩,成功的抑制了低頻雜訊.而使得雜訊値在77K時達到30–80 fT/Hz1/2.最後利用原子力顯微鏡和掃瞄穿隧電子顯微鏡,我們亦發現超導薄膜品質亦對SQUID 雜訊有很大的影響. | zh_TW |
| dc.description.abstract | The fabrication and characterization of high-Tc sensitivity SQUID magnetometers for biomagnetism at 77 K were investigated.
To pursue the high reproducibility and quality step edge for high-Tc SQUIDs, we have developed two-step procedures of fabricating very good step-edge substrates. We have characterized high-Tc step-edge SQUIDs connected in series. The flux-to-voltage transfer function increase with the number of SQUIDs. The flux noise, SΦ of the serial SQUID arrays scale as 1/N1/2. Second, we fabricated a serial low-noise direct-current superconducting quantum interference device (SQUID) magnetometer on a 10 mm × 10 mm SrTiO3 (100) bicrystal substrate. This field sensitivity around 30–80 fT/Hz1/2 has been obtained at 77 K in the white noise region. The latter noise has been avoided by optimizing the geometry of the pickup coil as well as by using the so-called flux dam. As a result, the 1/f noise of SQUIDs has been much improved. Finally, using atomic Force microscope (AFM) and scanning electric microscopy (SEM), we observe an inhomogeneous distribution and microstructural defects on YBCO grain-boundary Josephson junctions. SEM images show that these defects cause the grain boundary of YBCO thin film grown on the bicrystal to a few submicron depth of the groove in film. The existence of these defects is expected to affect the superconducting current and the motion of the magnetic flux in the films and hence generate noise in the devices. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-08T05:20:33Z (GMT). No. of bitstreams: 1 ntu-94-D89222018-1.pdf: 2539288 bytes, checksum: 524e9be7d21ac794c39fd9c362e122d6 (MD5) Previous issue date: 2005 | en |
| dc.description.tableofcontents | Contents
Chapter 1 Introduction 1 Chapter 2 High Tc junction and dc SQUID throry 5 2.1 Josephson junctions 5 2.2 DC SQUIDs: operation principles 9 2.3 Noise in dc SQUIDs 11 2.4 Design of SQUID magnetometer 13 2.5 Summary 15 Chapter 3 SQUID FABRICATION TECHNIQUES 17 3.1Thin films deposition 17 3.2 Pattern 20 3.3 SQUID Characteristic measurement 23 Chapter 4 Fabrication of step-edge substrates 29 4.1 Experimental 30 4.2 Results and discussion 31 4.3 Summary 36 Chapter 5 Serial Dc SQUID Arrays 38 5.1 Experimental 38 5.2 Results and discussion 39 5.3 Summary 47 Chapter 6 Low Intrinsic Low Frequency Noise of Directly Coupled High-Tc SQUID Magnetometers with Serial Flux Dams and Serial Bare-SQUIDs 50 6.1 Experimental 50 6.2 Results and discussion 52 6.3 Summary 54 Chapter 7 Influence of bicrystal microstructural defects on HTS dc SQUID 59 7.1 Experimental 60 7.2 Results and discussion 61 7.2 Summary 63 Chapter 8 Conclusion 70 References 72 | |
| dc.language.iso | en | |
| dc.subject | 低頻雜訊抑制 | zh_TW |
| dc.subject | 超導量子干涉元件 | zh_TW |
| dc.subject | 磁通水壩 | zh_TW |
| dc.subject | 階梯製作 | zh_TW |
| dc.subject | flux dam | en |
| dc.subject | low-frequency noise | en |
| dc.subject | step-edge | en |
| dc.subject | SQUID | en |
| dc.title | 應用於生物磁場的高靈敏超導量子干涉元件之製作與特性研究 | zh_TW |
| dc.title | Fabrication and Characterization of High Sensitivity SQUID Magnetometers for Biomagnetism | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 93-2 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 郭義雄,莊振益,洪姮娥,王立民,鄭振宗 | |
| dc.subject.keyword | 超導量子干涉元件,磁通水壩,低頻雜訊抑制,階梯製作, | zh_TW |
| dc.subject.keyword | SQUID,flux dam,step-edge,low-frequency noise, | en |
| dc.relation.page | 76 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2005-07-28 | |
| 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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| ntu-94-1.pdf 未授權公開取用 | 2.48 MB | Adobe PDF |
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