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We report new dust polarization results of a nearly edge-on disk in the HH212 protostellar system, obtained with ALMA at ~ 0.035" (14 au) resolution incontinuum at lambda ~ 878 um. Dust polarization is detected within ~ 44 au ofthe central source, where a rotationally supported disk has formed. Thepolarized emission forms V-shaped structures opening to the east and probablywest arising from the disk surfaces and arm structures further away in the eastand west that could be due to potential spiral arms excited in the outer disk.The polarization orientations are mainly parallel to the minor axis of thedisk, with some in the western part tilting slightly away from the minor axisto form a concave shape with respect to the center. This tilt of polarizationorientations is expected from dust self-scattering, e.g., by 50-75 um grains ina young disk. The polarized intensity and polarization degree both peak nearthe central source with a small dip at the central source and decrease towardsthe edges. These decreases of polarized intensity and polarization degree areexpected from dichroic extinction by grains aligned by poloidal fields, but mayalso be consistent with dust self-scattering if the grain size decreases towardthe edges. It is possible that both mechanisms are needed to produce theobserved dust polarization, suggesting the presence of both grain growth andpoloidal fields in the disk.

What Produces Dust Polarization in the HH 212 Protostellar Disk at 878 {\mu}m: Dust Self-Scattering or Dichroic Extinction?