Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/11523
標題: 離子束轟擊[鎳鐵/錳]及[鎳鐵/鉻]薄膜之微結構及磁性質研究
The studies of microstructures and magnetic properties of ion-beam bombarded [NiFe/Mn] and [NiFe/Cr] thin films.
作者: 劉琪欣
Liu, Chi-Hsin
關鍵字: 離子束轟擊
ion beam bombardment
交換偏壓
exchange bias
出版社: 材料科學與工程學系所
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摘要: 本實驗主要分為兩大部分,利用雙離子束濺鍍系統製備(i) [鎳鐵/錳]薄膜,探討利用不同電壓(0 V、150 V)之輔助離子束(End-Hall)轟擊以及不同層數之鐵磁與反鐵磁層薄膜對磁性質之影響;(ii) [鎳鐵/鉻]薄膜,探討利用不同電壓(0 V、150 V)之輔助離子束(End-Hall)轟擊之交換耦合之關係。 [鎳鐵/錳]多層薄膜之鎳鐵層為面心立方(f.c.c.)結構(晶格常數為3.55 A),錳層具有體心立方(b.c.c.)結構之α-錳(晶格常數為8.91 A)所組合而成,晶粒大小介於7~16 nm之間。磁性質分析結果顯示50 K下未經由離子束轟擊之[Ni80Fe20/Mn]50多層薄膜矯頑磁力(HC)為165 Oe,而經由離子束轟擊過後(VEH=150 V)矯頑磁力(HC)增加為265 Oe,而交換偏壓場(HEX)呈現出相反之趨勢,由-20 Oe降至為-3 Oe。場冷及零場冷圖形中可知經由離子束轟擊後會改變其阻隔溫度(TB)。磁電阻量測得知經由離子束轟擊過後會使總磁阻率發生下降。X光磁圓偏振二向性自旋轉換磁耦合於鎳鐵薄膜中顯示出良好的一致性,而錳層卻沒有明顯之磁化現象。極化中子反射儀初步結果得知:樣品在低溫及室溫均具有鐵磁/反鐵磁耦合及不對稱自旋之行為。 [鎳鐵/鉻]多層薄膜之鉻層具有體心立方(b.c.c.)結構(晶格常數為2.90 A),晶粒大小約為10 nm。磁性質分析結果顯示在室溫下經由離子束轟擊過後(VEH=150 V)鐵磁訊號消失,顯示此樣品在室溫為順磁性。10 K下未經由離子束轟擊之[Ni80Fe20/Cr]50多層薄膜矯頑磁力(HC)為7 Oe,而經由離子束轟擊過後(VEH=150 V)矯頑磁力(HC)增加為250 Oe,而交換偏壓場(HEX) 由2 Oe增加為15 Oe。造成交換偏壓場(HEX)之變化,推測是經由離子束轟擊而造成薄膜磁矩重新排列或鎳、鐵、鉻原子互相混合的結果,而離子束轟擊可能導致薄膜產生缺陷進而使矯頑磁力提升。另外,經離子束轟擊後之樣品具有不同之場冷及零場冷曲線,可能由於原子間互相混合所致。
The experiment was divided into two parts, (i)Ni80Fe20/Mn and (ii)Ni80Fe20/Cr were prepared by dual ion-beam deposition technique. The structure and magnetic properties were investigated by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Vibrating Sample Magnetometry (VSM), and also Atomic Force Microscopy (AFM). (i) The structure is face-centered cubic NiFe (a~3.81 A) phase and body-centered cubic α-Mn (a~8.91 A) phase. Grain sizes ranged from 7 to 16 nm. Under 50 K without the ion beam bombardment of [Ni80Fe20/Mn]50 coercivity (HC) 165 Oe, and with ion beam bombardment coercivity (HC) increased to 265 Oe, and exchange bias (HEX) showing a contrary trend, from -20 Oe to -3 Oe. Field cooled and zero field cooled shows via ion beam bombardment will change its blocking temperature (TB). Magnetoresistance measurements after ion beam bombardment that will decreased. The interplay between interlayer coupling and exchange bias coupling in [NiFe/Mn] multilayer-based thin films was investigated by controlling the configurations from superlattice to nanocomposite or hybrid structured thin films using ion-beam bombardment during deposition. Results have shown that well-defined interfaces in the superlattice [NiFe/Mn] thin film exhibited interlayer coupling behavior. In contrast, an enhanced coercivity was observed in the nanocomposite [NiFe-Mn] thin film. However, the hybrid [NiFe-Mn]/[NiFe/Mn] thin film with an intermixed NiFeMn alloyed film component gave rise to unusual positive exchange bias coupling. (ii) The structure of body-centered cubic Cr (a~2.90 A) phase. Grain sizes ranged about 10 nm. Magnetometry results [NiFe-Cr] thin film is enhanced by ion-beam bombardment. Under 10 K without the ion bea bombardment of [Ni80Fe20/Cr]50 coercivity (HC) 7 Oe, and with ion beam bombardment coercivity (HC) increased to 250 Oe, and exchange bias (HEX) showing incresae from 2 Oe to 15 Oe. Especially, the Cuire temperature of [NiFe/Cr] was changed by ion-beam bombardment, the range from 160 K to 298 K.
URI: http://hdl.handle.net/11455/11523
其他識別: U0005-2406201311325400
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2406201311325400
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