The suppression of temperature fluctuations by a rotating magnetic field in a high aspect ratio Czochralski configuration

Instability of the melt flow in VGF growth with a traveling magnetic field

“…[16] was adopted. It consists basically of a plexiglass cell with copper caps filled with molten gallium.…”

Numerical simulation of Cz crystal growth in rotating magnetic field with crystal and crucible rotations

“…It is evident that the flow pattern in the melt under no magnetic field is characterized by a large scale turbulent convective cell, however, a flow transition from large scale buoyancy driven to small scale magnetically driven turbulence occurs when rotating magnetic field is applied [10]. Here, we can see from 1 and case 2 is opposite to that of case 3, this is because the large convective cell below the crystal is controlled by the rotation of crystal.…”

“…The results showed that the flow motion consists of a primary flow in the azimuthal direction and a secondary flow in a meridional plane, which have three-dimensional and time-dependent structures, and that the strength and frequency of the rotating magnetic fields affect the time-dependent structure of the flow. Grants and Gerbeth [10] demonstrated experimentally in a low temperature model that a RMF has the potential to stabilize the inverse temperature gradient in a medium scale Czochralski facility with a high initial melt level. It means that the inverse temperature gradient is conducive to make flow unstable, however, under the influence of RMF the stabilization occurs as a result of a flow transition from large scale buoyancy driven to small scale magnetically driven turbulence.…”

The sensitivity of a travelling magnetic field driven flow to axial alignment

“…the suppression of temperature fluctuations, can be solved with an RMF (cf. [31]), this alternative is always worth considering.…”