21. In the antiferromagnetic case, a divergence is observed in the " staggered susceptibility ". 22. Various microscopic ( exchange ) interactions between the magnetic moments or spins may lead to antiferromagnetic structures. 23. Heat capacity measurements reveal an event at 78.3 K corresponding to ordering of antiferromagnetic state. 24. This makes possible magnetic imaging down to the atomic scale, for example, in antiferromagnetic system. 25. If they have the same magnitude, the crystal is antiferromagnetic and possesses no net magnetic moment. 26. Erbium is ferromagnetic below 19 K, antiferromagnetic between 19 and 80 K and paramagnetic above 80 K. 27. Type-I multiferroics which have been known for a long time are often good ferroelectrics and antiferromagnetic . 28. Their gap opens thanks to an unusual antiferromagnetic coupling between the magnetic moments at opposite edge carbon atoms. 29. Almandine is antiferromagnetic with the N�el temperature of 7.5 K . It contains two equivalent magnetic sublattices. 30. High quality single crystals have been important for studying the ferroelectric, antiferromagnetic and magnetoelectric properties of bismuth ferrite.
