Kavli Affiliate: Toeno Van Der Sar
| First 5 Authors: Talieh S. Ghiasi, Michael Borst, Samer Kurdi, Brecht G. Simon, Iacopo Bertelli
| Summary:
Magnetic imaging using nitrogen-vacancy (NV) spins in diamonds is a powerful
technique for acquiring quantitative information about sub-micron scale
magnetic order. A major challenge for its application in the research on
two-dimensional (2D) magnets is the positioning of the NV centers at a
well-defined, nanoscale distance to the target material required for detecting
the small magnetic fields generated by magnetic monolayers. Here, we develop a
diamond ‘dry-transfer’ technique, akin to the state-of-the-art 2D-materials
assembly methods, and use it to place a diamond micro-membrane in direct
contact with the 2D interlayer antiferromagnet CrSBr. We harness the resulting
NV-sample proximity to spatially resolve the magnetic stray fields generated by
the CrSBr, present only where the CrSBr thickness changes by an odd number of
layers. From the magnetic stray field of a single uncompensated ferromagnetic
layer in the CrSBr, we extract a monolayer magnetization of $M_mathrm{CSB}$ =
0.46(2) T, without the need for exfoliation of monolayer crystals or applying
large external magnetic fields. The ability to deterministically place
NV-ensemble sensors into contact with target materials and detect ferromagnetic
monolayer magnetizations paves the way for quantitative analysis of a wide
range of 2D magnets assembled on arbitrary target substrates.
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