Anisotropic Susceptibility of an Antiferromagnet in Applied Field

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Abstract
The anisotropy in the magnetic susceptibility of a uniaxial antiferromagnet in an applied field has been calculated using a simple molecular field model and measured using a novel set of susceptibility coils. The apparatus consists of a superconducting solenoid coaxially enclosing the susceptibility coils which in turn enclose a rotor for orienting the crystal. The customary molecular field model is solved explicitly for susceptibility as a function of applied field and angle. The theoretical and experimental values agree very well for all angles and fields.