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理學院
物理學系
學位論文
學位論文
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search.filters.author.李佳憲
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search.filters.subject.交換偏移
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search.filters.subject.Auger electron spectroscopy
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search.filters.subject.exchange bias
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search.filters.subject.surface magneto-optic Kerr effect
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search.filters.subject.ultrahigh vacuum
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超薄氧化鈷膜在銥(111)表面上的製備與物性探討
(
2008
)
李佳憲
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本論文內容將探討Co/CoO/Ir(111)超薄膜的薄膜成長與組成、表面磁性以及薄膜表面結構變化,並利用歐傑電子能譜儀、深度組成分析、表面磁光柯爾效應、低能量電子繞射等方法進行上述的研究。從薄膜成長與深度組成分析得知,在一定層數下的CoO會形成良好的化合狀態;將薄膜進行熱退火步驟後,O與Co的歐傑電子訊號比值會下降。CoO/Ir(111)超薄膜表面鍍上Co後,形成Co/CoO介面,零場冷卻後利用表面磁光柯爾效應儀測量磁滯曲線,發現隨著溫度的降低,矯頑力有增加的趨勢,但磁滯曲線呈現對稱的情況;在場冷卻下的表面磁性分析中,發現除了矯頑力增加,並且有交換偏移現象發生;從薄膜表面結構的觀察中,顯示出其結構週期性變強。經由系列化研究超薄膜系統在不同膜厚下的行為,可以得到鐵磁層與反鐵磁層間交換耦合的最佳條件。
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