Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/10920
標題: 非序化(FePt-Ag2Te)/序化(Ag/FePt)交換耦合薄膜之磁性質與微結構探討
Magnetic properties and microstructure of exchange-coupled disorder/order (FePt-Ag2Te)/(Ag/FePt) Film
作者: 劉秉豐
Liu, Bing-Fong
關鍵字: FePt
鐵白金
exchange couple
交換耦合
出版社: 材料科學與工程學系所
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摘要: 本實驗利用直流磁控濺鍍系統在玻璃基板上製備非序化(FePt-Ag2Te)/序化(Ag/FePt)的膜層。作法是在玻璃基板上先沉積一層Ag/FePt(order phase)底層,之後再沉積頂層FePt-Ag2Te,探討頂層在初鍍態、高溫退火、不同頂層膜厚、加鐵共鍍等等的變因下,其軟(FePt FCC phase)/硬(FePt L10 phase)磁相界面處交互耦合的作用。 當FePt-Ag2Te/Ag/FePt在頂層為初鍍態時,膜層具有較差的垂直磁異向性,且在XRD繞射圖中會出現FCC相的FePt繞射峰,顯示頂層軟磁較多的緣故。 當FePt-Ag2Te/Ag/FePt在頂層經過不同溫度退火之後,小於400 ℃退火時不能使FePt序化,反而會使得膜層的交互擴散使(001)的優選方位遭受到破壞。在高溫700 ℃退火,在頂層所存在的FCC相FePt會因為序化而減小,使得膜層具有較好的垂直磁異向性。 在頂層膜厚為3 nm退火700 ℃時,其殘存的未序化FePt軟磁相與底層硬磁相交界面處產生最大的交互耦合強度,垂直方向的矯頑磁力可下降至10.5 kOe,達到降低寫入場的效果。 在TEM的影像中發現加入Ag2Te,可以達到抑制FePt晶粒成長的效果,使得在頂層為10 nm,含Ag2Te較多的情況下,退火700 ℃後晶粒只成長到38.5 nm。
A soft/hard chemically disordered/ordered (FePt-Ag2Te)/(Ag-FePt) films was prepared on a glass substrate. Annealed (FePt-Ag2Te)/(Ag-FePt) film at 700oC for 1 minute allowed modification of the sharp interface to graded interface and the FePt-Ag2Te layer was changed from disordered to ordered. The out-of-plane magnetic hysteresis loops show perpendicular anisotropy with rigid magnetization which was due to the nanoscale interface exchange coupling. When the thickness of (FePt-Ag2Te) layer increased from 3nm to 10nm, the out-of-plane coercivity increased continuously which was interpreted by the degree of ordering and graded magnetic anisotropy. The exchange coupled composite film with perpendicular magnetization can be performed in the chemically disordered/ordered FePt system. In addition, a soft/hard chemically disordered/ordered (FePt-Fe)/(Ag/FePt) films was prepared on a glass substrate. The (FePt-Fe)/(Ag/FePt) film was exchange coupled and shows single switching field. Annealed (FePt-Fe)/(Ag/FePt) film from 200oC to 700oC for 1 minute allowed modification of the sharp interface to graded interface and the FePt-Fe layer was changed from disordered to ordered gradually. The 13% Ag2Te was alloyed into the FePt-Fe layer to separate the magnetic grains. The (FePt-Fe)/(Ag/FePt) films annealed from 200-600oC show two-steps out-of-plane magnetization curves. The magnetization of partially disordered FePt-Fe reversed first and followed by the ordered Ag/FePt film. When the film annealed at 700oC, the out-of-plane magnetic hysteresis loops show perpendicular anisotropy with rigid magnetization which was due to the nanoscale interface exchange coupling. The magnetization was reversed at a single switching field and interpreted by the two-spin model. The exchange coupled composite film with perpendicular magnetization can be performed in the chemically disordered/ ordered FePt system.
URI: http://hdl.handle.net/11455/10920
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