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A novel setup for the measurement of magnetic fields external to certainantiferromagnets and generally weakly remanent magnetic materials is presented.The setup features a highly sensitive Super Conducting Quantum InterferenceDevice (SQUID) magnetometer with a magnetic field resolution of approx. 10 fT,non-electric thermalization of the sample space for a temperature range of 1.5- 65 K with a non-electric sample movement drive and optical position encoding.To minimize magnetic susceptibility effects, the setup components are degaussedand realized with plastic materials in sample proximity. Running the setup inmagnetically shielded rooms allows for a well-defined ultra low magneticbackground field well below 150 nT in situ. The setup enables studies ofinherently weak magnetic materials which cannot be measured with high fieldsusceptibility setups, optical methods or neutron scattering techniques, givingnew opportunities for the research on e.g. spin-spiral multiferroics, skyrmionmaterials and spin ices.

An ultra-low field SQUID magnetometer for measuring antiferromagnetic and weakly remanent magnetic materials at low temperatures