Laser Heating of the Core-Shell Nanowires

Open access

Abstract

The induced thermal stress in a heating process is an important parameter to be known and controlled in the magnetization process of core-shell nanowires. This paper analyses the stress produced by a laser heating source placed at one end of a core-shell type structure. The thermal field was computed with the non-Fourier heat transport equation using a finite element method (FEM) implemented in Comsol Multiphysics. The internal stresses are essentially due to thermal gradients and different expansion characteristics of core and shell materials. The stress values were computed using the thermo elastic formalism and are depending on the laser beam parameters (spot size, power etc.) and system characteristics (dimensions, thermal characteristics). Stresses in the GPa range were estimated and consequently we find that the magnetic state of the system can be influenced significantly. A shell material as the glass which is a good thermal insulator induces in the magnetic core, the smaller stresses and consequently the smaller magnetoelastic energy. These results lead to a better understanding of the switching process in the magnetic materials.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • [1] S. Sun C. B. Murray D. Weller L. Folks A. Moser Science 287 1989–1992 (2000).

  • [2] Sh. Kang Z. Jia D. E. Nikles J. W. Harrell IEEE Transaction on Magnetics 39 5 (2003).

  • [3] B. X. Xu Z. J. Liu R. Ji Y. T. Toh J. F. Hu J. M. Li J. Zhang K. D. Ye C. W. Chia Journal of Applied Physics 111 07B701 (2012).

  • [4] S. Saranu S. Selve U. Kaiser L. Han U. Wiedwald P. Ziemann U. Herr J. Nanotechnol. 2 268-275 (2011).

  • [5] W. Wang Hai Dong et all Chinese Science Bulletin 57 24 (2012).

  • [6] J. Buschbeck et all J. Appl. Phys. 100 123901 (2006).

  • [7] COMSOL Multiphysics Heat Transfer Module and Structural Module.

  • [8] A. Helebrant C. Buerhop R. Weiβmann Glass Technology 34 4 (1993).

  • [9] C. J. Smitthels Metals Reference Book.

  • [10] F. Cardarelli The Handbook of Optical Materials.

  • [11] B. A. Bosley J. H. Weiner Theory of Thermal Stresses Wiley New York (1960).

  • [12] N. Noda R. B. Hetnarski and Y. Tanigawa Thermal Stresses 2nd ed. Taylor and Francis New York (2003).

  • [13] S. N. Hsiao S. H. Liu Applied Physics Letters 101 182404 (2012).

Search
Journal information
Metrics
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 257 56 1
PDF Downloads 87 30 0