Combined synchrotron X-ray diffraction and NV diamond magnetic microscopy measurements at high pressure

TL;DR

This paper demonstrates a novel method combining NV diamond magnetic microscopy with synchrotron X-ray diffraction to simultaneously study magnetic and structural changes in materials under high pressure.

Contribution

It introduces a new integrated approach enabling concurrent magnetic and structural measurements at high pressure conditions.

Findings

Successfully recorded correlated structural and magnetic transitions in iron.

Demonstrated simultaneous measurement of magnetic and structural properties.

Observed phase transitions of iron between 15 and 20 GPa at 300 K.

Abstract

We report the possibility to simultaneously perform wide-field nitrogen-vacancy (NV) diamond magnetic microscopy and synchrotron X-ray diffraction (XRD) measurements at high pressure. NV color centers are created on the culet of a diamond anvil which is integrated in a diamond anvil cell for static compression of the sample. The optically detected spin resonance of the NV centers is used to map the stray magnetic field produced by the sample magnetization. Using this combined scheme, the magnetic and structural behaviors can be simultaneously measured. As a proof-of-principle, we record the correlated {\alpha}-Fe to {\epsilon}-Fe structural and magnetic transitions of iron that occur here between 15 and 20 GPa at 300 K.