Magneto-chemical measurements of biochemical compounds with a superconducting magnetometer

Over the past decade Josephson's predictions1 have been extensively examined and verified in minute detail by many experimenters. Out of this study has come a scientific base upon which a new superconducting quantum electronics is being developed in many laboratories. This paper is a report of the development of a magnetometer instrument, based on principles of quantum superconductivity, which is now in routine use in our laboratory for magnetochemical measurements. For this purpose the high sensitivity of the superconducting magnetic sensor must be matched by very high standards of reproducibility, reliability, and precision of measurement over a temperature range from room temperature to below 4.2°K in magnetic fields up to 800 G.