長崎大学工学部・工学研究科 材料組織物性学研究室

Research (2015~)

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当研究室では,金属材料をメインターゲットとして,独自の組織制御法を考案することにより,優れた物性を有する新材料の開発に挑戦しています。下記に研究テーマの一例を紹介します。

鉄族金属を利用した磁性材料の開発

★ FePd系合金の規則不規則変態機構の解明
★ 強磁性金属ナノワイヤー配列構造型垂直磁化膜の開発
★ CPP-GMR(界面垂直通電型巨大磁気抵抗)素子の開発
★ AMR(異方性磁気抵抗)型ナノワイヤー配列素子の開発
  

CPP-GMR(界面垂直通電型巨大磁気抵抗)素子の開発

 
Figure (left) Time-dependence of observed current during the electrochemical in-situ contact process of Co/Cu multilayered nanowires in an anodized aluminum oxide nanochannel template. The cathode potential was alternatingly changed over between −0.4 V (for 1.0 s) and −1.05 V (for 0.1 s).
Figure (center) TEM images of a Co/Cu multilayered nanowire that was pulsed-potential deposited at −0.40 V for 1.0 s and −1.05 V for 0.1 s ( ac). The electron diffraction patterns are also shown in ( dd’). The Co/Cu multilayered nanowires were separated from an anodized aluminum oxide nanochannel template.
Figure (right) Effect of pulsed-potential for Co layers, E Co, on the magnetoresistance hysteresis loops of AAO nanochannel films with Co/Cu multilayered nanowire arrays. E Co was set at −1.00 V ( a), −1.05 V ( b), −1.10 V ( c) and −1.15 V ( d). A magnetic field was applied to perpendicular (solid lines) and in-plane (dotted lines) directions to the layers interface.
 
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高融点材料の室温電解合成とその物性評価

★ Cr, Mo, W等の高融点金属を含有した鉄族金属合金系硬質膜の電解合成
★ Alの陽極酸化法を利用したナノチャンネル型硬質メンブレンフィルターの開発
  

Alの陽極酸化法を利用したナノチャンネル型硬質メンブレンフィルターの開発

 
Figure (left) SEM images of top-surface (a), cross-section (b) and bottom-surface (c) of anodized aluminum oxide nanochannel templates that were anodized at 20 V for 24 hours. The electrolytic solution temperature was kept to 2℃ during the anodization.
Figure (right) TEM bright-field image and electron diffraction pattern of an electrodeposited Co nanowire.
 
詳しくはこちら

水溶液電解法を利用した低融点合金の作製とその物性評価

★ Sn基合金膜の電解析出とその溶融接合強度特性評価
★ Zn基合金膜の電解析出とその熱処理による相変態挙動解析
  

Sn基合金膜の電解析出とその溶融接合強度特性評価

 
Figure (left) Stress-strain curves obtained from butt-jointed copper rods which were soldered with electrodeposited Sn-Zn alloy films.
Figure (right) Effect of alloy composition on the tensile strength (a) and fracture elongation (b) of a pair of Cu rods which are jointed with electrodeposited Sn-Zn alloy films in the cross-section.
 
詳しくはこちら