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We present the first measurement of a non-zero magnetic field in theeclipsing material of a black widow pulsar. Black widows are millisecondpulsars which are ablating their companions; therefore they are often proposedas one potential source of isolated millisecond pulsars. PSR J2256-1024 is aneclipsing black widow discovered at radio wavelengths and later also observedin the X-ray and gamma parts of the spectrum. Here we present the radio timingsolution for PSR J2256-1024, polarization profiles at 350, 820, and 1500~MHzand an investigation of changes in the polarization profile due to eclipsingmaterial in the system. In the latter we find evidence of Faraday rotation inthe linear polarization shortly after eclipse, measuring a rotation measure of0.44(6) rad per meter squared and a corresponding line-of-sight magnetic fieldof 3.5(17) mG.

The GBT 350-MHz Drift Scan Pulsar Survey. III. Detection of a magnetic field in the eclipsing material of PSR J2256-1024