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Torque magnetometry is a key method to measure the magnetic anisotropy andquantum oscillations in metals. In order to resolve quantum oscillations insub-millimeter sized samples, piezo-electric micro-cantilevers were introduced.In the case of strongly correlated metals with large Fermi surfaces and highcyclotron masses, magnetic torque resolving powers in excess of $10^4$ arerequired at temperatures well below $1\,\mathrm{K}$ and magnetic fields beyond$10\,\mathrm{T}$. Here, we present a new broadband read-out scheme forpiezo-electric micro-cantilevers via Wheatstone-type resistance measurements inmagnetic fields up to $15\,\mathrm{T}$ and temperatures down to$100\,\mathrm{mK}$. By using a two-stage SQUID as null detector of a coldWheatstone bridge, we were able to achieve a magnetic moment resolution of$\Delta m= 5\times10^{-15}\,\mathrm{J/T}$ at maximal field, outperformingconventional magnetometers by at least two orders of magnitude in thistemperature and magnetic field range. Exemplary de Haas-van Alphen measurementof a newly grown delafossite, PdRhO$_2$, were used to show the superiorperformance of our setup.

Application of SQUIDs to low temperature and high magnetic field measurements - Ultra low noise torque magnetometry