Crystal growth of bulk InP from magnetically stabilized melts with a cusped field

Crystal growth of bulk InP using a cusped magnetic field has been investigated. A vertical arrangement of two Helmholz coils with opposite polarity provides the configuration for a cusped field. A comparison between growth of InP under an aligned axial field and a cusped field shows that turbulent melt flow is damped by the former but not by the latter. By use of IR transmission images, it was shown that each magnetic configuration has a different effect on interface shape, facet formation, and striation frequency. Although the cusped field produced a crystal with a flatter melt-solid interface, overall process control was enhanced only by growth from an axial magnetic field.