Magnetism and ferroelectricity

Temperature dependence of the uniaxial magnetic anisotropy of rhombohedral antiferromagnetic crystals with ions in the $S$ state

S. G. Ovchinnikov, V. V. Rudenko, V. I. Tugarinov

L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk

Abstract: The contributions of the anisotropic exchange to the firstand second-order uniaxial anisotropy constants have been calculated for hematite at $T$ = 0 K and arbitrary temperatures. The results of the calculations and the most significant mechanisms are taken into account in interpreting the temperature dependence of the anisotropy in rhombohedral antiferromagnetic crystals. The first-order anisotropy constant for hematite is described by the dipole interaction, contributions of the “single-ion” nature, and relatively small contributions of the anisotropic exchange. The second-order constant for hematite includes the “single-ion” contribution and the contribution of the anisotropic exchange. For FeBO$_3$ and MnCO$_3$ crystals, the main contributions to the first-order anisotropy constant come from the dipole and single-ion mechanisms.

Received: 18.02.2009
Accepted: 12.05.2009

 English version: Physics of the Solid State, 2010, 52:1, 112–116

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