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In this work, we present polarization profiles for 23 millisecond pulsarsobserved at 820 MHz and 1500 MHz with the Green Bank Telescope as part of theNANOGrav pulsar timing array. We calibrate the data using Mueller matrixsolutions calculated from observations of PSRs B1929+10 and J1022+1001. Wediscuss the polarization profiles, which can be used to constrain pulsaremission geometry, and present both the first published radio polarizationprofiles for nine pulsars and the discovery of very low intensity averageprofile components ("microcomponents") in four pulsars. Using the Faradayrotation measures, we measure for each pulsar and use it to calculate theGalactic magnetic field parallel to the line of sight for different lines ofsight through the interstellar medium. We fit for linear and sinusoidal trendsin time in the dispersion measure and Galactic magnetic field and detectmagnetic field variations with a period of one year in some pulsars, butoverall find that the variations in these parameters are more consistent with astochastic origin.

The NANOGrav 12.5-Year Data Set: Polarimetry and Faraday Rotation Measures from Observations of Millisecond Pulsars with the Green Bank Telescope