Optically transparent ferromagnetic nanogranular films with tunable transmittance

Nobukiyo Kobayashi, Hiroshi Masumoto, Saburo Takahashi, Sadamichi Maekawa

Research output: Contribution to journalArticle

17 Citations (Scopus)


Developing optically transparent magnets at room temperature is an important challenge. They would bring many innovations to various industries, not only for electronic and magnetic devices but also for optical applications. Here we introduce FeCo-(Al-fluoride) nanogranular films exhibiting ferromagnetic properties with high optical transparency in the visible light region. These films have a nanocomposite structure, in which nanometer-sized FeCo ferromagnetic granules are dispersed in an Al-fluoride crystallized matrix. The optical transmittance of these films is controlled by changing the magnetization. This is a new type of magneto-optical effect and is explained by spin-dependent charge oscillation between ferromagnetic granules due to quantum-mechanical tunneling.

Original languageEnglish
Article number34227
JournalScientific reports
Publication statusPublished - 2016 Sep 28

ASJC Scopus subject areas

  • General

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