Anomalous Relaxation in Magnetoresistance of Fe/Fe-O Granular System

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2012/10/01

タイトル(英語): Anomalous Relaxation in Magnetoresistance of Fe/Fe-O Granular System

著者名: Hiroshi Sakuma (Utsunomiya University), Tomoyasu Taniyama (Tokyo Institute of Technology), Kiyoshi Ishii (Utsunomiya University)

著者名(英語): Hiroshi Sakuma (Utsunomiya University), Tomoyasu Taniyama (Tokyo Institute of Technology), Kiyoshi Ishii (Utsunomiya University)

キーワード: Fe/Fe-O granular system，magnetoresistance，relaxation，spin-glass-like behavior

要約(英語): Fe/Fe-O granular thin films were fabricated by gas flow sputtering. Transmission electron microscopy analysis reveals that α-Fe granules are surrounded by a matrix consisting of tiny crystallites of Fe3O4 and/or γ-Fe2O3. The matrix acts as a tunnel barrier for electrical conductance. The Fe/Fe-O granular thin film exhibits an anomalous response to magnetic fields at low temperatures. When a magnetic field is applied, the resistance decreases. After the field is settled, the resistance increases for more than 1800s. A possible mechanism for the anomalous relaxation is the relaxation of the spins in the spin-glass-like Fe-O matrix.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.132 No.10 （2012） 特集（Ⅰ）：新機能性ナノスケール磁性材料の作製・評価 特集（Ⅱ）：イノベーションを支える最新の計測技術2012

本誌掲載ページ: 920-923 p

原稿種別: 論文／英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/132/10/132_920/_article/-char/ja/