非晶質 Fe-Ta合金의 磁氣的 性質에 關한 硏究 = Magnetic Properties of Amorphous Fe-Ta Alloys

다국어 초록 (Multilingual Abstract)

Binary alloys of Fe_xTa_100-x (15≤x≤95) were fabricated by high rate sputtering. The amorphous state, as verified by X-ray diffraction, is realized over a wide composition range of 15≤x≤90. The amorphous alloys with Fe concentration up to the threshold x_c??65 are non-magnetic. For the samples with x＞x_c, the magnetic ordering temperature (Tc) varies monotonically with Fe content to 200k for a-Fe_90 Ta_10. Measurement of the effective hyperfine field (H_eff) and the distribution of hyperfine field 〔P(H)〕have also been carried out. Small magnetic hyperfine field are observed, consistent with the small Fe magnetic moments measured. The concentration dependence of isomer shift and the electric quadrupole splitting have also been obtaind. The electric quadrupole splitting shows a large difference between Fe-rich and Ta-rich samples.

목차 (Table of Contents)

• Ⅰ. 序論
• Ⅱ. 實驗方法
• Ⅲ. 結果 및 考察
• 1. 非晶質 Fe-Ta合金系의 構造와 組成範圍
• 2. 磁氣的 秩序溫度(Tc)
• 3. 超微細相互作用
• 4. 異性體 shift와 電氣的 四極子分裂
• Ⅳ. 結論
• 參考文獻