Tunable electron transport with intergranular separation in FePt-C nanogranular films

Joshy Joseph, Jian Wang, B. S.D.Ch S. Varaprasad, Y. K. Takahashi, K. Hono, A. Rajanikanth

研究成果: Article査読

抄録

We report electron transport mechanism in FePt-C granular films as a function of temperature by varying intergranular separation. FePt-C nanogranular films were prepared by sputtering on MgO substrates. From magnetic measurement of the sample, a coercivity of about 3T was found in the perpendicular direction. Above 25 K, the electrical resistivity of the films were found to obey Mott variable range hopping, Efros-Shklovskii variable range hopping and extended critical regime depending on the intergranular separation. However, at lower temperatures it deviates from the above behaviour showing an increase in conductance. Reduced activation energy calculated from resistivity data of these films shows metal-insulator transition. The metallic nature observed at low temperature was attributed to the intergranular ferromagnetic type ordering between granules that enhances the transport of electrons. Intergranular separation, thus, can be used as a tool to engineer the electron transport mechanism to different hopping regimes or extended critical regime in these films.

本文言語English
論文番号046405
ジャーナルMaterials Research Express
7
4
DOI
出版ステータスPublished - 2020 4
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 生体材料
  • 表面、皮膜および薄膜
  • ポリマーおよびプラスチック
  • 金属および合金

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