Creation of light-induced large magneto-dielectric devices using magnetic nanostructures

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K22093
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 28:Nano/micro science and related fields
• Research Institution: Keio University
• Principal Investigator: KAIJU Hideo 慶應義塾大学, 理工学部(矢上), 准教授 (70396323)
• Co-Investigator(Kenkyū-buntansha): 西井 準治 北海道大学, 電子科学研究所, 教授 (60357697) ; 長浜 太郎 北海道大学, 工学研究院, 准教授 (20357651)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: スピントロニクス / ナノ構造 / 磁性 / 誘電率 / 光学

Outline of Final Research Achievements

Magnetic granular devices, which consist of nanoparticles dispersed in an insulating matrix, show interesting phenomena related to magnetism, dielectrics, and light, such as magnetoresistance effect, magnetocapacitance effect, and Faraday effect. In this study, we investigate photo-induced magneto-dielectric effect and clarify the mechanism of the phenomena in two-dimensional magnetic granular. As a result, we successfully observe light-induced resistance (LR) effect and light-induced capacitance (LC) effect in two-dimensional magnetic granular. We can also explain the LR effect by quantum-mechanical tunneling (QMT) model and LC effect by Debye-Frohlich (DF) model, respectively.

Free Research Field

応用物性

Academic Significance and Societal Importance of the Research Achievements

本研究成果は、光学、磁性、誘電性が互いに融合した新たな学際領域を創出させると同時に、次世代超高感度・低消費電力磁気メモリ素子の実現に向けた新しい設計指針を与えるものと期待できる。