反強磁性体の物性と応用の接点

概要

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The Neel temperature, spin structure, magnetic domain, exchange striction, linear magnetostriction, exchange anisotropy, and elastic and electrical properties of antiferromagnets are discussed from the viewpoint of their practical use in spin valves. First, the concentration dependence of the Neel temperature of Mn- and Cr-systems is reviewed. Next, the spin structures of Mn-Ir and Mn-Pt alloys are presented as representative examples. Then, the magnetic domains modulated by twins in a NiO single crystal are compared with the huge domains in a pure Cr single crystal. The ΔE effect is explained in terms of the linear magnetostriction, and the relation between the spin configuration and the exchange anisotropy is discussed. Furthermore, the effect of pressure on the Neel temperature is correlated with the spin structure and with the spontaneous magnetostriction. Finally, the electrical and magnetic properties of antiferromagnets are discussed, taking into account their electronic structure and stoichiometric composition.
社団法人日本磁気学会の論文
1997-08-01