Melt flow stabilisation in bulk crystal growth by means of external magnetic fields


Melt flow stabilisation in bulk crystal growth by means of external magnetic fields

Pätzold, O.; Lantzsch, R.; Greif, A.; Galindo, V.; Grants, I.; Gerbeth, G.; Stelter, M.

Several approaches to suppress a non-stationary melt flow and related fluctuations of the temperature and the dopant concentration in bulk crystal growth by means of external magnetic fields are presented. The paper includes results of model and growth experiments carried out in Bridgman- or Czochralski-like configurations under the influence of different fields (rotating, traveling, axial steady, cusp, combinations of which). It is shown that both time-dependent and steady fields can be used to stabilize a melt. The impact of a magnetic field on the melt flow, however, depends strongly on the configuration and thermal conditions of the growth. Therefore, type and parameters of the applied field have to be properly adjusted to the particular setup under consideration to achieve an optimal damping of fluctuations and to avoid unfavorable effects.

Keywords: bulk crystal growth; external magnetic fields

  • Contribution to proceedings
    6th International Conference on Electromagnetic Processing of Materials (EPM 2009), 19.-23.10.2009, Dresden, Germany, 978-3-936104-65-3, 849-862
  • Lecture (Conference)
    6th International Conference on Electromagnetic Processing of Materials (EPM 2009), 19.-23.10.2009, Dresden, Germany

Permalink: https://www.hzdr.de/publications/Publ-13738
Publ.-Id: 13738