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We report the fabrication of a directly coupled superconducting quantuminterference device (SQUID) magnetometer in MgB2 using a focused ion beam (FIB)to create Josephson junctions in a 70 nm thick film of MgB2. The SQUID shows avoltage modulation (deltaV) of 175 mV at a temperature of 10 K and operatesover a temperature range from 10 K to 24 K. We find excellent agreement betweenthe measured maximum transfer functions and those predicted by theory. We havemeasured the magnetic flux noise at 20 K to be as low as 14 micro Phi-0 perroot Hz.Comment: 11 pages, 4 figure

Directly coupled superconducting quantum interference device magnetometer fabricated in magnesium diboride by focused ion beam