Patent ID: 8398765

Claim:
A method of controlling crystal growth in a crystal growing system, the crystal growing system having a heated crucible including a semiconductor melt from which a monocrystalline ingot is grown according to a Czochralski process, the ingot being grown on a seed crystal pulled from the melt, said method comprising: applying an unbalanced cusped magnetic field to the melt comprising a first magnetic field and a second magnetic field, the first magnetic field having a field strength that is different than a field strength of the second magnetic field, wherein the strength of at least one of the first magnetic field and the second magnetic field is such that a Karman cell formed directly below the seed crystal in the semiconductor melt is strengthened, and wherein strengthening the Karman cell facilitates the formation of a concave melt-solid interface; and rotating the ingot and the crucible in the same direction while the ingot is being pulled from the melt.