What Does ANNNI Stand For?

ANNNI stands for Axial Next Nearest Neighbor Ising Model Of Superstructure

ANNNI, or Axial Next Nearest Neighbor Ising Model Of Superstructure, is a sophisticated theoretical framework used in statistical physics to study magnetic properties and phase transitions in materials. This model extends the traditional Ising model by incorporating interactions between axial nearest and next-nearest neighbor spins, enabling a more accurate representation of complex magnetic superstructures. ANNNI is particularly valuable for analyzing phenomena such as commensurate and incommensurate phases in materials, providing insights into the behavior of magnetic systems at varying temperatures and external influences.