= Gold-iron alloy susceptibility experiment
{title2=1972}
<V. Cannella> and <J. A. Mydosh> measured low-field <magnetic susceptibility> of <gold>-<iron> <alloys> using a <mutual inductance> bridge. Moving samples into and out of the pickup arrangement separated their signal from the background. Cooling revealed sharp susceptibility cusps; changing concentration, sample shape and applied <magnetic field> tested their interpretation. Larger fields rounded the peaks. Their 1972 paper interpreted low-concentration ordering in antiferromagnetic terms: the cusp alone did not demonstrate Parisi's later theory.<Magnetic Ordering in Gold-Iron Alloys by Vincent Cannella and John A. Mydosh>[§III, p. 4224, mutual-inductance method; §V, pp. 4228–4230, figures 9–12 and field/shape comparisons; abstract for the authors' contemporary interpretation]{ref}
This experiment measures a response to a small applied perturbation, rather than directly photographing frozen <spins>. Comparing field strengths is essential because the probing <magnetic field> itself changes the response.<Magnetic Ordering in Gold-Iron Alloys by Vincent Cannella and John A. Mydosh>[§V.A, pp. 4229–4230, weak-field cusp rounding]{ref}
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