講演情報
[7p-P03-38]磁気トンネル接合における磁気キャパシタンス効果の絶縁層膜厚依存性と数値計算モデリング
〇岡崎 隆太1、柴田 有仁1、松坂 美月1、若本 瑞葵1、介川 裕章2、海住 英生1,3 (1.慶大理工、2.物質材料研究機構、3.慶大スピンセンター)
キーワード：
TMC効果、絶縁層膜厚依存性、磁気トンネル接合
We have achieved the largest tunnel magnetocapacitance (TMC) of over 650% in the high frequency region at room temperature in magnetic tunnel junctions (MTJs) consisting of a ferromagnetic-layer/insulator/ferromagnetic-layer. The TMC was remarkable at low frequencies and only about 50% at high frequencies. In this study, by using MTJs with a FeCo/MgO/FeCo structure with a thin insulator of MgO, the response of the electric dipole at high frequencies was enhanced, resulting in a significant improvement in TMC. This is due to the high-frequency response of the interfacial electric dipole based on the Debye-Fröhlich (DF) model. We also calculate the insulator thickness dependence of the TMC effect by the extended DF model. These findings contribute to a deeper understanding on the exact mechanism of the TMC effect, and the prospect of an increasingly large TMC at higher frequencies opens exciting opportunities for novel spintronic applications.