物理學系

Permanent URI for this communityhttp://rportal.lib.ntnu.edu.tw/handle/20.500.12235/56

本系師資陣容堅強,現有教授15人、副教授12人、助理教授2人、名譽教授5人,每年國科會補助之專題研究計畫超過廿個,補助之經費每年約三千萬,研究成果耀眼,發表於國際著名期刊(SCI)的論文數每年約70篇。

近年來已在課程方面 著手變革,因應學子的各種不同的生涯規劃與需求,加強職業輔導與專業能力的提升,增加高科技相關課程,提供光電學程(光電半導體、半導體製程技術、近代光 學與光電科技等)、凝態物理、表面物理與奈米科技、高能與理論物理、生物物理、應用物理等研究發展專業人才,並配合博士逕讀辦法,讓大學部學生最快能在五 年內取的碩士(透過碩士班先修生),八年內取得博士,有助於提升本系基礎與應用研發能量,為各學術研究機構與業界高科技創新與研發人力(包括在光電業、半 導體製造業、電腦週邊產業等)。

本系亦推動網路教學(科學園)與數位科學研究,作為提供科學教學與學習系統平台的強化支援,並除了原先開設的教育學程外,多增強學生英語教學的能力,與世界科學教師系統連結,在教師從業方面,塑造世界級的物理科學教師,發揮教育影響力。

News

Browse

Search Results

Now showing 1 - 1 of 1
  • Item
    鐵超薄薄膜在銥(111)上之表面結構與磁學性質研究
    (2014) 陳暐翔; Wei-Hsiang Chen
    Magnetic properties and surface structure of ultrathin Fe/Ir(111) films have been investigated using the surface magneto-optic Kerr effect and low-energy electron diffraction. Layer-by-layer growth of Fe/Ir(111) is observed for the first three monolayers at room temperature. For Fe thinner than three monolayers, pseudomorphic growth of Fe films is observed. The layer distance is close to that of fcc(111) Fe. For Fe thicker than three monolayers, the surface structure can be identified to be related to the bcc(110) arrangement of Fe atoms in Kurdjumov-Sachs orientation. As the Fe thickness increases, the linear increase of the Kerr intensity is observed. The Kerr intensity comes from the bcc-Fe and a thin magnetic dead layer is observed at the interface. The magnetic properties and surface structure of ultrathin Fe/Ir(111) films after high temperature annealing treatment have also been investigated. The Fe atoms diffuse into the Ir(111) substrate to be a FexIr1-x alloy as annealing temperature increases. For annealing temperature between 750 K and 800 K, there is a blocking of the interdiffusion behavior for Fe atoms into the Ir(111) substrate and the existence of the specific concentration of Fe of the FexIr1-x interface alloy which shows a stable state at this annealing temperature region. Combining the experimental results of Auger analysis, LEED patterns and the theoretical calculations, one can conclude that the specific concentration of Fe of the FexIr1-x interface alloy at the stable state is Fe0.5Ir0.5 as annealing temperature between 750 K and 800 K. For 5~9 ML Fe/Ir(111) films, a layered structure of Fe/FexIr1-x/Ir(111) could be obtained after high temperature annealing treatment. The surface of this layered structure becomes flatter after the high temperature annealing treatment. The structure of the top Fe films can be identified to be related to the bcc(110) arrangement of Fe atoms in Kurdjumov-Sachs orientation, however, strained by the underneath Fe0.5Ir0.5 interface alloy since this interface alloy is also strained by Ir(111) substrate which leads to the change of the lattice parameter of the unit cell of Fe bcc(110) at the surface from 0.248 nm to 0.272 nm. The surface structure transition between the KS orientation to strained KS orientation for 5~9 ML Fe/Ir(111) at annealing temperature from 300 K to 700 K have also been investigated. For annealing temperature less than 550 K, the KS orientation shows low periodicity. The periodicity of this KS orientation gets better as annealing temperature increases and become stable as annealing temperature larger than 700 K. Finally, the structural, compositional and magnetic phase diagram of Fe/Ir(111) is constructed. For Fe film thinner than 3 ML at annealing temperature between 300 K and 900 K, no Kerr intensity is observed due to the fcc arrangement of Fe films and FexIr1-x alloy. For Fe films thicker than 3 ML, Kerr intensity could be observed owing to the bcc arrangement of Fe films. The coercivity and saturation magnetization enhanced abruptly (higher than Fe/Pt(111) system) after the high temperature annealing treatment which is because of the compositional and structural change of this system.