透過氫氣作用控制磁性層間交互耦合效應
dc.contributor | 林文欽 | zh_TW |
dc.contributor | Lin, Wen-Chin | en_US |
dc.contributor.author | 陳宜樺 | zh_TW |
dc.contributor.author | Chen, Yi-Hua | en_US |
dc.date.accessioned | 2019-09-05T02:09:37Z | |
dc.date.available | 2018-08-24 | |
dc.date.available | 2019-09-05T02:09:37Z | |
dc.date.issued | 2017 | |
dc.description.abstract | 長期以來,鈀一直作為氫氣解離和吸附的高效催化劑。在鈀合金或內米結構中,鈀的氫化容易引起相鄰材料有顯著的鄰近效應。在本實驗中,我們在超高真空中使用電子束蒸發磊晶法,在MgO (001)的基底上製備了磁性界面耦合系統。通過退火處理,可以得到平坦的MgO (001)表面,用來沉積Fe/Pd/Fe三層膜。 在一定鈀的厚度下,通過磁光柯爾效應在平行(In-Plane)方向,可以在Fe/Pd/Fe/MgO(001)系統中觀察到清楚的雙磁滯曲線。這現象說明頂層和底層鐵層之間的反鐵磁耦合。隨著室溫下的氫氣脫吸附,反鐵磁層間耦合有明顯的變化,如雙磁滯曲線的矯頑場變化所示。這結果表示,鐵/鈀多層膜系統未來可以應用為敏感性高的氫氣感測GMR傳感器 | zh_TW |
dc.description.abstract | Pd has long been used as a high efficient catalyst for hydrogen dissociation and absorption. In the Pd-alloys or nanostructures, the hydrogenation of Pd easily brings in pronounced proximity effect upon the adjacent functional materials. In this experiment, we prepared the magnetic exchange interlayer coupled system, Fe/Pd/Fe trilayers, on MgO(001) substrates using e-beam evaporation in an ultrahigh vacuum. Through a suitable annealing process, a flat MgO(001) surface can be achieved for the deposition of the Fe/Pd/Fe trilayer. With a certain Pd thickness, clear double hysteresis loops were observed in the Fe/Pd/Fe/MgO(001) system by using magneto optical Kerr effect in the in-plane direction. This indicates the antiferromagnetic coupling between the top and bottom Fe layers. With cyclic hydrogen absorption and desorption at room temperature, the antiferromagnetic interlayer-coupling was considerably and reversibly changed, as indicated by the change of the shift field of the double loops. This observation suggests that the Fe/Pd-multilayer system can serve as a GMR sensor for sensitive hydrogen sensing in the future applications. | en_US |
dc.description.sponsorship | 物理學系 | zh_TW |
dc.identifier | G060341016S | |
dc.identifier.uri | http://etds.lib.ntnu.edu.tw/cgi-bin/gs32/gsweb.cgi?o=dstdcdr&s=id=%22G060341016S%22.&%22.id.& | |
dc.identifier.uri | http://rportal.lib.ntnu.edu.tw:80/handle/20.500.12235/102474 | |
dc.language | 中文 | |
dc.subject | 磁性 | zh_TW |
dc.subject | 合金 | zh_TW |
dc.subject | 薄膜 | zh_TW |
dc.subject | 氫氣效應 | zh_TW |
dc.subject | Magnetism | en_US |
dc.subject | alloy | en_US |
dc.subject | thin film | en_US |
dc.subject | hydrogenation | en_US |
dc.title | 透過氫氣作用控制磁性層間交互耦合效應 | zh_TW |
dc.title | Modulation of magnetic interlayer-coupling in Fe/Pd/Fe/MgO(001) through cyclic hydrogenation | en_US |
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