Magnetic anisotropy of HO3+ in holmium-aluminium-garnet

Abstract
The field induced magnetocrystalline anisotropy of Ho3+ in Aluminium garnet was measured by the torque method at 4.2K in magnetic fields up to 70 kOe, and was compared to the magnetization. The exponent of the power law, κ4∞mn, was found to be 4 when m is small and to approach gradually to 10 as m was increased, as has been predicted by Callen and Callen; this measurement is the first confirmation of the power law of the field induced anisotropy.

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