Dielectric properties and magnetoelectric effects in FeCo-MgF insulating nanogranular films

N. Kobayashi, T. Iwasa, K. Ishida, H. Masumoto

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Multifunctional properties of matter, including dielectric and magnetic properties, are of great interest in physics and applications. Here, we investigate the dielectric properties and magnetoelectric effects in FeCo-MgF insulating nanogranular films. These films have a nanogranular structure in which Fe-Co alloy-based magnetic granules are dispersed in an Mg-F insulator-based matrix. Both a large dielectric constant of about 420 at 100-kHz and a large magnetoelectric effect of about 6.2% are obtained at room temperature. Insulating nanogranular films are a new class of multifunctional materials. The dielectric properties and the magnetoelectric effects originate in the nano-structure which consists of a magnetic metal and an insulator, and are explained by the spin-dependent tunneling charge oscillation between a pair of magnetic granules.

Original languageEnglish
Article number014101
JournalJournal of Applied Physics
Volume117
Issue number1
DOIs
Publication statusPublished - 2015 Jan 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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