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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林昭吟 | |
dc.contributor.author | Guan-Yu Luo | en |
dc.contributor.author | 駱冠宇 | zh_TW |
dc.date.accessioned | 2021-06-15T11:39:40Z | - |
dc.date.available | 2021-08-24 | |
dc.date.copyright | 2016-08-24 | |
dc.date.issued | 2016 | |
dc.date.submitted | 2016-08-15 | |
dc.identifier.citation | References
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/49647 | - |
dc.description.abstract | Ferromagnetic resonance (FMR) driven spin pumping is a novel method to transfer spin angular momentum from the ferromagnetic (FM) layer into the adjacent nonmagnetic metal (NM) layer in an FM/NM bilayer system. Consequently, the spin current can be probed in the NM layer via inverse
spin Hall effect (ISHE) when spin-charge conversion occurs. Although a scaling behavior of the ISHE voltage vs. FMR pumping angle was observed in various FM/Pt bilayers with FM being a Heusler alloy, ferromagnetic oxide spinel and dilute magnetic semiconductor, the influences of conductivity and the interface properties on the spin current density are still not well understood. Among many, Pt is considered as the most effective NM for spin-charge conversion due to its strong spin orbital coupling. In contrast with previous reports, we grow Pt and Pd on La0.7Sr0.3MnO3 (LSMO) and study the spin transport properties of these two systems. By fitting with the spin pumping model, the values of spin transport parameters are obtained, including the interface spin mixing conductance, the spin diffusion length of Pt(Pd) and spin Hall angle. The values for LSMO/Pt (LSMO/Pd) bilayer are 2.18×1019 m-2 (1.81×1019 m-2 ) for spin mixing conductance, 6.0 nm (7.6 nm) for spin diffusion length and 0.013 (0.004) for spin Hall angle. In particular, two models were used to calculate spin diffusion length and spin Hall angle, with and without spin current back flow. It is found that the value of spin Hall angle is sensitive to the model modification while the mixing conductance is not. This finding provides some insight to resolve the controversy of experimental results of spin Hall angle from different groups. Another finding is that the spin current densities of LSMO/Pt and LSMO/Pd are very close (~0.70 nJ/m2 at 40 mW) and comparable to that of Py/Pt, which makes LSMO a potential FM spin pump. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T11:39:40Z (GMT). No. of bitstreams: 1 ntu-105-D99222008-1.pdf: 6642178 bytes, checksum: b554d27d0990359d7a2e9449b39d6ac8 (MD5) Previous issue date: 2016 | en |
dc.description.tableofcontents | CONTENTS
ACKNOWLEDGEMENT............................................................................................i 中文摘要………………………………………………………………………………ii ABSTRACT………………………………………………………………………...…iii CONTENTS……………………………………………………….…………………iv LIST OF FIGURES………………………………………………………………….vi LIST OF TABLES…………………………………………………………………..xiv Chapter 1 Introduction…………………………………………………………1 1.1 History of spintronics……………………………………………………….1 1.2 Detection techniques of spin current………………...…………………….6 1.3 Perovskite manganites...................................................................................15 1.4 Motivation......................................................................................................20 Chapter 2 Theoretical background……............……………………………22 2.1 Spin-orbit interaction…….…………………………………………………22 2.2 Spin current….……………………………………………………………...24 2.3 Spin Hall effect and inverse spin Hall effect ……...………………………..26 2.4 Ferromagnetic resonance……..……………………………………………..30 2.5 Phenomenological model of spin pumping…..……………………………..34 Chapter 3 Experimental techniques……………………….….…….………40 3.1 Sample preparation…....………...……..……………………………………40 3.1.1 Solid-state reaction……..………………………………………………40 3.1.2 Pulsed laser deposition……..…………………………………………..41 3.1.3 Magnetron-sputtering…….…………………………………………….42 3.2 Film Characterization…………………...…………….…………………….43 3.2.1 X-ray diffraction…………………………………………………….…43 3.2.2 Four-probe measurement………………………………………………44 3.2.3 Superconducting quantum interference device vibrating sample magnetometer (SQUID VSM)………………………………...………45 3.2.4 Atomic force microscopy (AFM)..........................................................46 3.2.5 Transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS)...............................................................................47 3.3 Ferromagnetic resonance technique.........................................................49 3.4 Inverse spin Hall effect...............................................................................50 Chapter 4 Results and discussions..................................................................52 4.1 Crystal structure and composition............................................................52 4.1.1 Bulk La0.7Sr0.3MnO3 (LSMO).................................................................52 4.1.2 SrTiO3 (STO)/LSMO single layers.........................................................54 4.1.3 STO/LSMO/Pt(Pd) bilayers....................................................................59 4.2 Morphology...................................................................................................61 4.2.1 STO/LSMO single layers.......................................................................61 4.2.2 STO/LSMO/Pt(Pd) bilayers...................................................................63 4.3 Electrical Conductivity and Magnetization...............................................64 4.3.1 Bulk LSMO.............................................................................................64 4.3.2 STO/LSMO single layers.......................................................................65 4.3.3 STO/LSMO/Pt bilayers..........................................................................69 4.4 Spin Pumping................................................................................................71 4.4.1 Testing samples.......................................................................................71 4.4.2 STO/LSMO(20)/Pt(x) bilayers...............................................................84 4.4.3 STO/LSMO(20)/Pd(x) bilayers..............................................................95 Chapter 5 Conclusions.......................................................................................101 References..............................................................................................................102 Appendix A............................................................................................................108 Appendix B............................................................................................................115 Appendix C............................................................................................................118 Appendix D............................................................................................................120 List of Publications.............................................................................................122 | |
dc.language.iso | en | |
dc.title | 鑭鍶錳氧與白金鈀金雙層膜結構之自旋幫浦效應 | zh_TW |
dc.title | Spin Pumping Effect in (La, Sr)MnO3 Capped with Pt or Pd | en |
dc.type | Thesis | |
dc.date.schoolyear | 104-2 | |
dc.description.degree | 博士 | |
dc.contributor.coadvisor | 張慶瑞 | |
dc.contributor.oralexamcommittee | 李尚凡,黃斯衍,白奇峰 | |
dc.subject.keyword | 自旋電子學, | zh_TW |
dc.subject.keyword | spintronics, | en |
dc.relation.page | 122 | |
dc.identifier.doi | 10.6342/NTU201602452 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2016-08-16 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 物理學研究所 | zh_TW |
顯示於系所單位: | 物理學系 |
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