Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/11227
標題: [鉑/鈷]z/氧化鎳多層膜之結構與磁性質之研究
The Structures and Magnetic Properties of [Pt/Co]z/NiO Multilayers
作者: 張書綺
Chang, Shu-Chi
關鍵字: exchange bias
交換偏壓
ion beam sputter
離子束濺鍍
出版社: 材料工程學系所
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摘要: 本研究利用雙離子束沉積技術,將不同厚度及層數(Z)的[Pt/Co]z多層膜沉積在厚度為35 nm的NiO上,製備成[Pt/Co]z/NiO膜,探討其結構與磁性質;以及將不同厚度的Pt中間層(t nm)沉積於[Pt(4 nm)/Co(2 nm)]4多層膜及NiO間,探討中間層厚度對磁性質的影響。利用XRD及TEM來判定結構,得知 [Pt/Co]z/NiO多層膜主要是由f.c.c.結構之Pt (a= 3.93Å)、h.c.p.結構之Co (a= 2.46 Å, c= 4.10 Å)與岩鹽結構之NiO (a= 4.26 Å)所組成。且由TEM分析結果顯示:多晶[Pt/Co]z/NiO多層膜之晶粒大小介於5~15 nm之間。 磁性分析結果顯示:相較於 [Pt(3 nm)/Co(2.5 nm)]4/NiO多層膜,[Pt(12 nm)/Co(10 nm)]1/NiO多層膜的Hc與Hex具有較大的溫度相依性。[Pt(12 nm)/Co(10 nm)]1/NiO多層膜其Hc與Hex隨溫度降低而明顯增加:在T=5K(平行膜面施加50 kOe之外加場,場冷至5 K)具有最大的Hc (~ 4800 Oe)及Hex (~ -1300 Oe)。此外,[Pt(3 nm)/Co(1.25 nm)]4/NiO 多層膜具有垂直交換偏壓,在T= 80K時,Hex⊥~ -150 Oe,這是因為Co層磁矩開始沿著垂直膜面方向傾斜,增強了與NiO底層間的交換偶合作用。 而[Pt(4 nm)/Co(2 nm)]4/Pt(t nm)/NiO 多層膜無平行膜面的交換偏壓(in-plane exchange bias):當磁場平行膜面量測時,各試片皆沒有明顯的Hex,即使於5 K的低溫亦是如此;而當外加場垂直膜面量測,於160K時,Hc及Hex皆呈現隨著Pt中間層厚度的增加而減少的趨勢,Pt中間層最薄(0 nm)之試片具有最大之Hex⊥ (~ -137 Oe),顯示隨著Pt厚度的增加,阻隔了NiO與Co間的交互作用。推測 [Pt(4 nm)/Co(2 nm)]4/Pt(t nm)/NiO多層膜其Co層磁矩有沿著垂直膜面方向傾斜,故在160K無平行膜面的交換場而具有垂直膜面方向的交換場。
Exchange bias in [Pt/Co]/NiO multilayers were studied as a function of film thickness and [Pt/Co] layer repetition. A strong temperature dependence of the coercivity, Hc, and exchange bias field, Hex, was observed for a thick and thinnest [Pt/Co]/NiO multilayers. While the thinnest [Pt(3 nm)/Co(1.25 nm)]4/NiO multilayer exhibits no in-plane exchange bias field, a perpendicular Hex
URI: http://hdl.handle.net/11455/11227
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