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Magnetic encoders currently provide accurate positioning information byreading periodic patterns with equally spaced structures or bits. As thistechnology evolves to fulfill industrial demands for cheaper and more accuratesystems, variations of this concept with non-periodic and non-predeterminedpatterns emerge. In this work, we take the first step towards the developmentof such devices using equally sized bits with different separations. We showmagnetic scans of 1000 {\mu}m wide and 2000 {\AA} thick CoCrPt structures withseparations between 63 and 3000 {\mu}m, obtained with tunnel magnetoresisistivesensors. A theoretical model to describe the magnetic field created by thesestructures is also proposed, which matches the trend of the experimentalsignals. We also show that there is a spatial resolution loss for readingdistances higher than a threshold that depends on the minimum feature size ofthe sample.

Reading thin film permanent magnet irregular patterns using magnetoresistive sensors