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Abstract
A SQUID magnetometer enables dc magnetic moments to be measured with excellent sensitivity. An rf-SQUID magnetometer was constructed to detect magnetoelectric signals from a Cr2O3 single crystal. Noise level of the magnetometer was about 10−8 emu. A maximum value of 15.3 × 10−5 cgs-Gauss (i.e. 23×10−6 cgs/g) at 255 K and a value of -4.7×10−4 cgs-Gauss (i.e. -7.0×10−6 cgs/g) at 4.2 K were obtained for α∥ and α⊥ respectively. These values and previously published data on the electric field shift in the antiferromagnetic resonance were then utilized to determine the contribution of electric field dependencies of both the exchange and g-factor to the magnetoelectric effect. A commercially available SQUID magnetometer was also tested on both Cr2O3 and YIG single crystals.
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