Retrieving "Ferromagnet" from the archives

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1. Ferroelectricity

   Linked via "ferromagnets"

   A key characteristic of ferroelectrics is the existence of ferroelectric domains. Within a single domain, the polarization vector points uniformly in one direction. However, to minimize the overall electrostatic energy associated with the macroscopic surface charge density ($\sigmaP = \mathbf{P}s \cdot \mathbf{n}$), the material self-assembles into regions where neighboring domains possess oppositely directed polarization vectors.
   When an external electric field is applied, the domain walls move, causing the domains aligned favorab…

2. Symmetry Breaking

   Linked via "ferromagnet"

   Symmetry Restoration
   Symmetry restoration occurs when the system is driven back across the critical threshold, recovering the higher-symmetry state. This is most commonly achieved by increasing the temperature (e.g., heating a ferromagnet above its Curie temperature. At the critical point itself, the system exists in a state where the correlation length diverges, and the system exhibits full rotational invariance even if the ordered phase below the critical temperature does not.
   The Blueshift of Water