New Developments in GMW Projected Field Electromagnet Systems

Ahead of upcoming MMM and IEDM Conferences, GMW continue to improve upon Projected Field Electromagnet Systems with added power supply, pole option and probe card integration possibilities. Systems can be customized for individual device testing, or for array testing where larger region of interest is required without extensively compromising on magnetic field magnitude.

The most recent addition is the model 5207, optimized for perpendicular field with continuously adjustable pole for optimal position with respect to sample. The pole tip can be customized for specific geometries, including 4mm x  4mm array testing or individual devices with peak fields above 1.3T. The 5207 can also be easily configured (and changed in field) from series to parallel coil connections, allowing for use with wide range of supplies. A range of bipolar power supplies are available to take advantage of required waveforms; continuous, pulsed, triangle with options for very fast ramping with higher voltage power supplies. The BPS-85-70-EC with +/-70A output allows for full field of 0.8T and fast ramping over 4mm x 4mm array of the 5207, and even faster ramping at 85% of full field is possible by changing coil configuration of the 5207 to lower resistance and inductance.

Similar techniques are available for the 5203, now with significant installation base and integrated into many commercial probe stations.

GMW also have now worked with probe card manufacturers to allow for very close placement of sample to pole – within 250um with custom Magnetic Pole Extender integrated with a Celadon Non-Ferrous VersaCore™. The Celadon cards can be matched with GMW Projected Field Electromagnets to allow for complete system compatible with any probe station.

GMW will have the 5207 at both the upcoming MMM and IEDM conferences, along with models of the complete line of Projected Field Electromagnet Systems, and detailed specifications on the BPS power supply and “traditional” GMW dipoles, with first results for the new Model 3483 H-Frame dipole.