Nitrogen-vacancy magnetometry of CrSBr by diamond membrane transfer

Abstract

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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Cited by in corpus (10)

• Nanoscale magnetism and magnetic phase transitions in atomically thin CrSBr
• Roadmap on Quantum Magnetic Materials
• Fundamentals and applications of Van der Waals magnets in magnon spintronics
• Towards high spatial resolution magnetic imaging with a compact practical quantum diamond microscope
• Ferromagnetism above 200 K in organic-ion intercalated CrSBr
• Twist Engineering of Anisotropic Excitonic and Optical Properties of a Two-Dimensional Magnetic Semiconductor
• Spin waves in the bilayer van der Waals magnet CrSBr
• Investigations of optical aberration on quantum diamond microscopy toward high spatial resolution and sensitivity
• Creation of Depth-Confined, Shallow Nitrogen-Vacancy Centers in Diamond With Tunable Density
• Laser-cut Patterned, Micrometer-thin Diamond Membranes with Coherent Color Centers for Open Microcavities