Magnetic antiferromagnetism

In 1962 Heller and Benedek made aeeiirate measurements of the zero-field magnetization of the antiferromagnet MnF2 as a fiinetion of temperature and reported a p of 0.335 0.005, a result supporting an experimental parallelism between fluids and magnets. 

Figure 1 Energy difference between the possible antiferromagnetic states and the ferromagnetic one as the function of Au concentration in the substrate. and J, refer to the orientation of the magnetic moments in a layer. The substrate is assumed to be on the left hand side.

P. Griinberg, R. Schreiber, Y. Pang, M.B. Brodsky, and H. Sowers, Layered magnetic structures Evidence for antiferromagnetic coupling of Fe layers across Cr interlayers, Phys. Rev. Lett. 57, 2442 (1986). 

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