Stray magnetic field imaging of thin exfoliated iron halides flakes

Fernando Meneses, Rongrong Qi, Alexander J. Healey, Yi You, Islay O. Robertson, Sam C. Scholten, Ashok Keerthi, Gary Harrison, Achintya Bera, Hiran Jyothilal, Lloyd C. L. Hollenberg, Boya Radha, Jean-Philippe Tetienne

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Abstract

Magnetic van der Waals materials are often proposed for use in future spintronic devices, aiming to leverage the combination of long-range magnetic order and near-atomic thinness to produce energy-efficient components. One class of material that has been discussed in this context are the iron halides FeCl2 and FeBr2, which are A-type antiferromagnets with strong uniaxial magnetocrystalline anisotropy. However, despite characterization of the bulk materials, the possibility for sustaining the magnetic behaviors that would underpin such applications in thin flakes has not been investigated. In this work, we use nitrogen-vacancy center microscopy to quantitatively image magnetism in individual exfoliated flakes of these iron halides, revealing the absence of magnetic remanence, a weak induced magnetization under bias field, and variable behavior versus temperature. We show that our results are consistent with the antiferromagnetic behavior of the bulk material with a soft ferromagnetic uncompensated layer, indicating that extended (>1µm) ferromagnetic domains are not sustained even at low temperatures (down to 4 K). Finally, we find that the magnetic order is strongly affected by the sample preparation, with a surprising diamagnetic behavior observed in a thin, hydrated sample.
Original languageEnglish
Article number064416
JournalPhysical Review B
Volume109
Issue number6
Early online date1 Feb 2024
DOIs
Publication statusPublished - 20 Feb 2024

Research Beacons, Institutes and Platforms

  • National Graphene Institute

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