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The magnetocaloric effect or "magnetic Gr\"uneisen ratio"$\Gamma_H=T^{-1}(dT/dH)_S$ quantifies the cooling or heating of a material whenan applied magnetic field is changed under adiabatic conditions. Recently thisproperty has attracted considerable interest in the field of quantumcriticality. Here we report the development of a low-frequency alternatingfield technique which allows to perform continuous temperature scans of$\Gamma_H(T)$ on small single crystals with very high precision and down tovery low temperatures. Measurements on doped YbRh$_2$Si$_2$ show that$\Gamma_H(T)$ can be determined with this technique in a faster and much moreaccurate way than by calculation from magnetization and specific heatmeasurements.

High-resolution alternating-field technique to determine the magnetocaloric effect of metals down to very low temperatures