Polarized-Neutron Study of Hematite

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Abstract
Polarized-neutron studies on natural and synthetic single crystals of hematite have shown that the 180° antiferromagnetic domain walls are removed in low fields as the parasitic ferromagnetism of the high-temperature phase is saturated, and the remaining 120° walls are removed by the application of higher fields. No memory effect was observed for the antiferromagnetic domain configuration as the crystal was cycled through the spin-axis transition temperature. The spin density of the ferromagnetic component of the spin system was found to be different from that of the antiferromagnetic component.