Co/Ptナノドットにおけるマイクロ波アシスト磁化反転の交流磁場強度依存性

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: 2015/04/01

タイトル(英語): Radio Frequency Field Dependence of Microwave Assisted Switching Behaviors of Co/Pt Nanodots

著者名: 古田　正樹（東北大学多元物質科学研究所），岡本　聡（東北大学多元物質科学研究所），菊池　伸明（東北大学多元物質科学研究所），北上　修（東北大学多元物質科学研究所），島津　武仁（東北大学学際科学フロンティア研究所／東北大学電気通信研究所）

著者名(英語): Masaki Furuta (Institute of Multidisciplinary Research for Advanced Materials, Tohoku University), Satoshi Okamoto (Institute of Multidisciplinary Research for Advanced Materials, Tohoku University), Nobuaki Kikuchi (Institute of Multidisciplinary Research for Advanced Materials, Tohoku University), Osamu Kitakami (Institute of Multidisciplinary Research for Advanced Materials, Tohoku University), Takehito Shimatsu (Frontier Research Institute for Interdisciplinary, Tohoku University/Research Institute of Electrical Communication, Tohoku University)

キーワード: マイクロ波，磁化反転，歳差運動，ナノドット　　microwave，magnetization switching，precessional motion，nanodot

要約(英語): Microwave assisted magnetization switching (MAS) has been expected as one of the prominent future ultra-high density magnetic recording technologies. In this paper, we have studied the rf field dependence of the switching behavior of Co/Pt nanodot arrays with various dot diameters. While the critical frequency increases and the minimum switching field decreases with increasing the rf field, MAS behavior critically depends on the dot size. For small dots less than 130 nm in diameter, the critical frequency and the minimum switching field exhibit linear variation with the rf field. On the other hand, for the larger dots (dot diameter ≥ 230 nm), they exhibit not only profound MAS effect but also obvious change in the behavior at a certain rf field. These changes of MAS behaviors are explained as a consequence of the change of magnetization precessional mode. On the other hand, the dispersions of MAS effect exhibit no remarkable variation on the rf field.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.135 No.4 （2015） 特集：平成26年基礎・材料・共通部門大会

本誌掲載ページ: 229-234 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/135/4/135_229/_article/-char/ja/