A single domain in magnetic materials refers to a magnetic region that is uniformly magnetized in a single direction. In these materials, the magnetic moments of atoms are aligned in one direction, and this alignment is maintained throughout the entire domain, as opposed to having varying orientations as seen in multi-domain structures. Key characteristics of single domain particles include: 1. **Size:** Single domain behavior is typically observed in small magnetic particles, usually on the order of nanometers to a few micrometers in diameter.
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