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The internal thermal stresses during the cooling process of a nanowire from alumina membrane

I. ASTEFANOAEI1, H. CHIRIAC2, A. STANCU1,*

Affiliation

  1. “Alexandru Ioan Cuza” University, Faculty of Physics, 700506, Iasi, Romania
  2. NDT Department, National Institute of R&D for Technical Physics, Iasi, Romania

Abstract

We present in this paper the internal thermal stresses appearing in Co nanowires in alumina template when they are cooled from the room temperature to 3 Kelvin. Thermal stresses are evaluated with a finite element method (FEM), taking into account the difference between the thermal expansion coefficients of cobalt and alumina membrane. The coupling between the magnetostriction and the stress distribution leads to an easy axes distribution associated with a magnetic domain structure consisting of a cylindrical inner core with axial magnetization and a cylindrical outer shell with radial magnetization of about 2% from the entire radius..

Keywords

Thermal stresses, Nanowires arrays, Magnetic materials.

Submitted at: April 1, 2008
Accepted at: July 1, 2008

Citation

I. ASTEFANOAEI, H. CHIRIAC, A. STANCU, The internal thermal stresses during the cooling process of a nanowire from alumina membrane, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 7, pp. 1763-1766 (2008)