Retrieving "Long Range Magnetic Order" from the archives

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1. Exchange Interaction

   Linked via "long-range magnetic order"

   Antiferromagnetism
   When the exchange interaction is negative ($J < 0$), the ground state favors the alignment of adjacent spins in opposite directions, resulting in a net zero macroscopic magnetic moment. This state is known as antiferromagnetism. Unlike the ferromagnetic case, the transition temperature, the Néel temperature ($T_N$), marks the point where the [long-range magnetic order](/entrie…