Nitrogen-vacancy magnetometry of CrSBr by diamond membrane transfer

Talieh S. Ghiasi*, Michael Borst, Samer Kurdi, Brecht G. Simon, Iacopo Bertelli, Carla Boix-Constant, Samuel Mañas-Valero, Herre S.J. van der Zant, Toeno van der Sar

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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 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.

Original languageEnglish
Article number62
Number of pages7
Journalnpj 2D Materials and Applications
Issue number1
Publication statusPublished - 2023

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