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High frequency characteristics and magnetic properties of FeCoB/SiO2 nanogranular films

M. URSE1,* , H. CHIRIAC1, M. TIBU1, M. GRIGORAS1

Affiliation

  1. National Institute of R & D for Technical Physics, 47 Mangeron Blvd., 700050 Iasi, Romania

Abstract

Soft magnetic films with high resistivity at high frequencies are required in areas like magnetic microinductors for communication devices and automotive industry. The hetero-amorphous structure composed of metal ferromagnetic – insulator films exhibits much higher resistivity in contrast to the conventional nanocrystalline structures because it holds magnetic softness without exchange interaction between the metal particles. Their high saturation magnetization and high resistivity are beneficial to obtain high power density and low loss in thin film inductors that can be used for R.F - Integrated Circuits. This paper reports some results concerning the high frequency behaviour of the electrical and magnetic properties for [FeCoB/(SiO2)]⋅n thin films. The annealed [FeCoB/(SiO2)]⋅60 thin films with the resistivity ρ ≅ 48.2 mΩ⋅m, saturation magnetization Ms ≅ 149 emu/g and coercive field Hc ≅ 7 Oe were used for the frequency testings. This system exhibits a good electrical and magnetic response in the high frequency range..

Keywords

High frequency, Electrical and magnetic properties, Thin films, Multilayers, Inductor.

Submitted at: Sept. 8, 2006
Accepted at: Sept. 13, 2006

Citation

M. URSE, H. CHIRIAC, M. TIBU, M. GRIGORAS, High frequency characteristics and magnetic properties of FeCoB/SiO2 nanogranular films, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 5, pp. 1761-1764 (2006)