Appearance of Ferromagnetic Property for Si Nanopolycrystalline Body and Vanishing of Electrical Resistances at Local High Frequencies

Joint Authors

Inada, Mitsuru
Saiki, T.
Iida, Yukio

Source

Journal of Nanomaterials

Issue

Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-12, 12 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2018-11-25

Country of Publication

Egypt

No. of Pages

12

Main Subjects

Chemistry
Civil Engineering

Abstract EN

Reduction in the skin effect for the sintered Si nanopolycrystalline body as an electricity conductor at a high frequency due to its nanostructure was studied.

Singular disappearance of electrical resistances near a local high magnetic harmonic frequency of a few MHz was observed.

This phenomenon has not been observed for conventional ferromagnetic metals.

The measured electrical resistances changed to almost 0 mΩ at room temperature.

At the same time, negative resistance of the sintered Si nanopolycrystalline body was observed.

It will be applicable to electronic transmittance lines or semiconductors.

Numerical calculation was also performed on the electrical resistance with frequency dependency while considering the electric field and magnetic field in the sintered Si nanopolycrystalline body.

The experimental and calculated results are compared.

The calculation could explain the variation of the relative permittivity of the Si nanopolycrystalline body and the phenomenon for the theoretical disappearance of the resistivity at the MHz frequency.

Reduced Si nanoparticles from SiO2 powder were synthesized by laser ablation in liquid.

A Si nanopolycrystalline body made of the reduced Si nanoparticles was fabricated.

It was found by measuring the magnetization property of the body of the sintered Si nanopolycrystalline body which is ferromagnetic.

Dangling bonds (unpaired electrons) have long been known to occur due to defects in Si crystals.

Perfect Si without defective crystals has no dangling bonds.

However, Si nanoparticles have many dangling bonds.

High-density dangling bonds cause the sintered Si nanopolycrystalline body to have ferromagnetism.

In this study, the density of the unpaired electrons in the sintered Si nanopolycrystalline body was observed using ESR.

It has been clarified that the Si nanopowder and the sintered Si nanopolycrystalline body have numerous dangling bonds.

Both densities of the dangling bonds were evaluated.

American Psychological Association (APA)

Saiki, T.& Iida, Yukio& Inada, Mitsuru. 2018. Appearance of Ferromagnetic Property for Si Nanopolycrystalline Body and Vanishing of Electrical Resistances at Local High Frequencies. Journal of Nanomaterials،Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1195069

Modern Language Association (MLA)

Saiki, T.…[et al.]. Appearance of Ferromagnetic Property for Si Nanopolycrystalline Body and Vanishing of Electrical Resistances at Local High Frequencies. Journal of Nanomaterials No. 2018 (2018), pp.1-12.
https://search.emarefa.net/detail/BIM-1195069

American Medical Association (AMA)

Saiki, T.& Iida, Yukio& Inada, Mitsuru. Appearance of Ferromagnetic Property for Si Nanopolycrystalline Body and Vanishing of Electrical Resistances at Local High Frequencies. Journal of Nanomaterials. 2018. Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1195069

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1195069