透過氫氣作用控制磁性層間交互耦合效應

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dc.contributor林文欽zh_TW
dc.contributorLin, Wen-Chinen_US
dc.contributor.author陳宜樺zh_TW
dc.contributor.authorChen, Yi-Huaen_US
dc.date.accessioned2019-09-05T02:09:37Z
dc.date.available2018-08-24
dc.date.available2019-09-05T02:09:37Z
dc.date.issued2017
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.identifierG060341016S
dc.identifier.urihttp://etds.lib.ntnu.edu.tw/cgi-bin/gs32/gsweb.cgi?o=dstdcdr&s=id=%22G060341016S%22.&%22.id.&
dc.identifier.urihttp://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.subjectMagnetismen_US
dc.subjectalloyen_US
dc.subjectthin filmen_US
dc.subjecthydrogenationen_US
dc.title透過氫氣作用控制磁性層間交互耦合效應zh_TW
dc.titleModulation of magnetic interlayer-coupling in Fe/Pd/Fe/MgO(001) through cyclic hydrogenationen_US

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