Antiferromagnets are materials where adjacent magnetic moments, or spins, align in opposite directions. This results in a net magnetic moment of zero, even though the individual spins are ordered. They typically occur in certain metals and oxides, such as iron oxide and manganese oxide, and are characterized by their unique magnetic properties. In antiferromagnetic materials, the alignment of spins can change with temperature. At higher temperatures, thermal energy can disrupt the ordered state, leading to a transition to a paramagnetic phase. This behavior is important in various applications, including spintronics and magnetic sensors, where controlling magnetic properties is essential.