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Induced residual stresses in the preparation process of the glass-covered amorphous magnetic microwires

I. ASTEFANOAEI1,* , D. RADU1, H. CHIRIAC2

Affiliation

  1. “Al.I. Cuza” University, Faculty of Physics, Carol I Blvd., No. 11, RO-700050, Iasi, Romania
  2. National Institute of Research and Development for Technical Physics, 47 Mangeron Blvd., Iasi 3, Romania

Abstract

In this paper we analyze the internal residual stresses that appear both during the solidification process and during cooling to the room temperature for a glass-covered amorphous magnetic microwire made from a FeBSi-type alloy, maintained at a constant temperature, w T . We have proposed an improved theoretical method for calculation of the distribution of the internal stresses induced during both the solidification of the metal part and the cooling of the microwire, taking into account the difference between the thermal expansion coefficients of metal and glass. Theoretically obtained results are in very good agreement with the experimental data. The coupling between the positive magnetostriction and the stresses’ distribution leads to an easy axes distribution associated with a magnetic domain structure consisting of a cylindrical inner core with axial magnetization (having the radius R ≅ c 94 % out of the metal part’s radius) and a cylindrical outer shell with radial magnetization. If, in addition we consider the thermal stresses induced during the cooling process to the room temperature, then we found that the theoretical value of the magnetizations’ ratio / M M is very close to the experimental r s one..

Keywords

Residual stresses, Glass-covered amorphous microwires, Magnetic materials.

Submitted at: March 15, 2006
Accepted at: May 18, 2006

Citation

I. ASTEFANOAEI, D. RADU, H. CHIRIAC, Induced residual stresses in the preparation process of the glass-covered amorphous magnetic microwires, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 3, pp. 978-987 (2006)