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電子線ホログラフィーによる、スピンアイス中のモノポール顕微観察への挑戦
https://doi.org/10.15102/1394.00001789
https://doi.org/10.15102/1394.000017895e925a90-2cc3-4f91-a0d5-8c5094fe2ffc
| 名前 / ファイル | ライセンス | アクション |
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Final_Exam_Abstract (42.9 kB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||||
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| 公開日 | 2021-03-19 | |||||||
| タイトル | ||||||||
| タイトル | 電子線ホログラフィーによる、スピンアイス中のモノポール顕微観察への挑戦 | |||||||
| 言語 | ja | |||||||
| タイトル | ||||||||
| タイトル | Imaging Monopoles in Spin Ice via Electron Holography | |||||||
| 言語 | en | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||
| 資源タイプ | doctoral thesis | |||||||
| ID登録 | ||||||||
| ID登録 | 10.15102/1394.00001789 | |||||||
| ID登録タイプ | JaLC | |||||||
| アクセス権 | ||||||||
| アクセス権 | open access | |||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
| 著者 (英) |
Dhar, Ankur
× Dhar, Ankur
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| 抄録 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | Originally proposed by Pierre Curie, magnetic monopoles in vacuum have long remained elusive to detection, but recently mergent monopoles of the microscopic H field have been shown to exist in spin ice. As such, they present a valuable testing ground for the physics of magnetic monopoles which remain elusive as high energy particles. However, signatures of monopoles in spin-ice materials have only been indirect so far, and their direct observation has remained an open challenge since their discovery. One such technique that would make this direct observation a reality is electron holography, due to the electron’s high sensitivity to magnetic fields via the Aharonov-Bohm effect. Currently the best holographic microscopes can achieve 3D spatial imaging of spin phenomena with sub-nanometer resolution. In this thesis, I explore the possibility of imaging monopoles with electron holography through experimental measurements of monopole and spin ice analogs and computational simulation of how a monopole would appear in a pyrochlore spin ice thin film. My experimental work focused on measuring the phase signal from an elongated magnetic needle, as well as artificial spin ice formed from a 2D lattice of nanoscale magnets. My simulated results show for the first time what a monopole in pyrochlore spin ice would look like if imaged using electron holography. The experimental and simulation results together help define the technical requirements and experimental signals required to achieve direct observation of magnetic monopoles in spin ice via electron holography. | |||||||
| 言語 | en | |||||||
| 口頭試問日 | ||||||||
| 2020-07-27 | ||||||||
| 学位授与年月日 | ||||||||
| 学位授与年月日 | 2020-08-31 | |||||||
| 学位名 | ||||||||
| 学位名 | Doctor of Philosophy | |||||||
| 学位授与番号 | ||||||||
| 学位授与番号 | 甲第58号 | |||||||
| 学位授与機関 | ||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||
| 学位授与機関識別子 | 38005 | |||||||
| 学位授与機関名 | Okinawa Institute of Science and Technology Graduate University | |||||||
| 著者版フラグ | ||||||||
| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
| 権利 | ||||||||
| 権利情報 | © 2020 The Author. | |||||||
