Research Papers in Physics and Astronomy


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Published in PHYSICAL REVIEW LETTERS 106, 087202 (2011), 25 FEBRUARY 2011; doi: 10.1103/PhysRevLett.106.087202 Copyright 2011 American Physical Society. Used by permission.


We report the direct observation of surface magnetization domains of the magnetoelectric Cr2O3 using photoemission electron microscopy with magnetic circular dichroism contrast and magnetic force microscopy. The domain pattern is strongly affected by the applied electric field conditions. Zero-field cooling results in an equal representation of the two domain types, while electric-field cooling selects one dominant domain type. These observations confirm the existence of surface magnetization, required by symmetry in magnetoelectric antiferromagnets.

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