The low-temperature magnetic structure of hexagonal FeGe

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Abstract
The low-temperature magnetic structure of the hexagonal modification of FeGe has been determined by neutron diffraction methods. Below a transition temperature of 30.5+or-0.5K, the iron moments cant away from the (001) direction to form a double-coned structure in which alternate antiferromagnetically aligned (001) sheets of iron atom moments make an angle of about 16 degrees to (001). The repeat period of the basal plane component of the moment is 0.009+or-0.001 AA-1. The iron moment remains sensibly constant across the transition with a value somewhere in the range 1.60 and 1.74 mu B, dependent on the particular form factor used to interpret the data. This moment value is consistent with that derived from neutron powder diffraction measurements made at 4.2K.