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We have developed an absolute magnetic field sensor using SuperconductingQuantum Interference Filter (SQIF) made of high-T_c grain boundary Josephsonjunctions. The device shows the typical magnetic field dependent voltageresponse V(B), which is sharp delta-like dip in the vicinity of zero magneticfield. When the SQIF is cooled with magnetic shield, and then the shield isremoved, the presence of the ambient magnetic field induces a shift of the dipposition from B_0 ~ 0 to a value B ~ B_1, which is about the average value ofthe earth magnetic field, at our latitude. When the SQIF is cooled in theambient field without shielding, the dip is first found at B ~ B_1, and thefurther shielding of the SQIF results in a shift of the dip towards B_0 ~ 0.The low hysteresis observed in the sequence of experiments (less than 5% ofB_1) makes SQIFs suitable for high precision measurements of the absolutemagnetic field. The experimental results are discussed in view of potentialapplications of high-T_c SQIFs in magnetometry.Comment: 4 pages, 2 figure

High-performance magnetic field sensor based on superconducting quantum interference filters