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Pressure is a unique tool to tune the interplay between structural,electronic and magnetic interactions. It leads to remarkable properties ofmaterials such as recent temperature records in superconductivity. Advancedmagnetic measurements under very high pressure in the Diamond Anvil Cell (DAC)use synchrotron approaches but these are lacking a formal link to themacroscopic magnetic properties. We report an alternative method consisting inoptical magnetometry based on nitrogen-vacancy (NV) centers created at thesurface of a diamond anvil. We illustrate the method by two measurementsrealized at room and low temperature respectively: the pressure evolution ofthe magnetization of an iron bead up to 30 GPa showing the iron ferromagneticcollapse and the detection of the superconducting transition of MgB2 at 7 GPa.

Magnetic measurements on micron-size samples under high pressure using designed NV centers