Tunnel-type magneto-dielectric effect and its annealing study in CoSiO2 granular films

Yang Cao, Nobukiyo Kobayashi, Shigehiro Ohnuma, Hiroshi Masumoto

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Tunnel-type magneto-dielectric (TMD) effect arising from the spin-dependent quantum tunneling between nano-sized granular pairs, has opened up new route for room temperature magnetoelectric fields. We first investigated the TMD properties in metal-oxide (CoSiO2) granular films and their annealing effect in this work. Results show that the films exhibit a TMD ratio (¾000) of 1% with high electrical resistivity of >108 µ3·m and intermediate optical transmittance in Co0.24(SiO2)0.76 films. Annealing investigations suggest that the samples remain TMD response up to 573 K, and further increment in annealing temperature leads to the inter-diffusion between Co and SiO2 interfaces, thus producing the increasing oxidation of metallic Co. This study demonstrates the possibility of TMD effect in metal-oxide composite materials, and may be desirable for a variety of other wide oxide-based candidates for magnetoelectric device applications.

Original languageEnglish
Pages (from-to)585-589
Number of pages5
JournalMaterials Transactions
Issue number4
Publication statusPublished - 2018


  • Annealing effect
  • Granular nano-composites
  • Magneto-dielectric properties


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