Antiferromagnetic materials are substances where the magnetic moments of atoms or ions align in opposite directions, effectively canceling each other out. This results in no net magnetization in the material, even when exposed to an external magnetic field. Common examples of antiferromagnetic materials include iron oxide and manganese oxide. In antiferromagnetic systems, the alignment of magnetic moments occurs in a regular pattern, often described as a staggered arrangement. This unique property is crucial in various applications, including spintronics, where the manipulation of electron spins is used to develop advanced electronic devices.