Ferromagnetic Interlayer Coupling in CrSBr Crystals Irradiated by Ions

Long, Fangchao; Ghorbani-Asl, Mahdi; Mosina, Kseniia; Li, Yi; Lin, Kaiman; Ganss, Fabian; Hübner, René; Sofer, Zdenek; Dirnberger, Florian; Kamra, Akashdeep; Krasheninnikov, Arkady V.; Prucnal, Slawomir; Helm, Manfred; Zhou, Shengqiang

doi:10.1021/acs.nanolett.3c01920

Cited by 8 publications

(6 citation statements)

References 33 publications

(65 reference statements)

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“…Interestingly, thin film CrSBr exhibits ferromagnetic phases at low temperatures, with a Curie temperature of approximately 40 K. 10 The underlying cause of this ferromagnetic phenomenon remains unclear. However, our recent studies 24 suggest that it is mediated by defects, which can be controllably generated by ion irradiation.…”

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Strong Exciton–Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr

Lin,

Sun,

Dirnberger

et al. 2024

ACS Nano

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The layered, air-stable van der Waals antiferromagnetic compound CrSBr exhibits pronounced coupling among its optical, electronic, and magnetic properties. As an example, exciton dynamics can be significantly influenced by lattice vibrations through exciton−phonon coupling. Using lowtemperature photoluminescence spectroscopy, we demonstrate the effective coupling between excitons and phonons in nanometer-thick CrSBr. By careful analysis, we identify that the satellite peaks predominantly arise from the interaction between the exciton and an optical phonon with a frequency of 118 cm −1 (∼14.6 meV) due to the out-of-plane vibration of Br atoms. Power-dependent and temperature-dependent photoluminescence measurements support exciton−phonon coupling and indicate a coupling between magnetic and optical properties, suggesting the possibility of carrier localization in the material. The presence of strong coupling between the exciton and the lattice may have important implications for the design of light−matter interactions in magnetic semiconductors and provide insights into the exciton dynamics in CrSBr. This highlights the potential for exploiting exciton−phonon coupling to control the optical properties of layered antiferromagnetic materials.

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confidence: 99%

“…The underlying cause of this ferromagnetic phenomenon remains unclear. However, our recent studies suggest that it is mediated by defects, which can be controllably generated by ion irradiation.…”

mentioning

confidence: 99%

Strong Exciton–Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr

Lin,

Sun,

Dirnberger

et al. 2024

ACS Nano

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“…This same result is also observed for the irradiated samples, providing evidence that the easy axis remains stable despite a decrease in the magnetization. The H//c measurement for the irradiated sample (figure 2(b)) shows a large bifurcation between the FC and ZFC curves at low temperatures (T < 30 K) that is not present in the pristine magnetization (figure 2(a)), suggesting alterations to the magnetic anisotropy of irradiated CST, potentially due to the change in the magnetic exchange coupling upon proton radiation [27][28][29][30]. In contrast, the H//ab magnetization data is similar in both samples, indicating that the applied field is too small to accurately detect any anisotropic effects in this direction, although this observation may also be due to the spin glass behavior.…”

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confidence: 99%

Proton-fluence dependent magnetic properties of exfoliable quasi-2D van der Waals Cr₂Si₂Te₆ magnet

Iturriaga,

Chen,

Yang

et al. 2024

J. Phys.: Condens. Matter

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The discovery of long-range magnetic ordering in atomically thin materials catapulted the van der Waals (vdW) family of compounds into an unprecedented popularity, leading to potentially important technological applications in magnetic storage and magneto-transport devices, as well as photoelectric sensors. With the potential for the use of vdW materials in space exploration technologies it is critical to understand how the properties of such materials are affected by ionizing proton irradiation. Owing to their robust intra-layer stability and sensitivity to external perturbations, these materials also provide excellent opportunities for studying proton irradiation as a non-destructive tool for controlling their magnetic properties. Specifically, the exfoliable Cr2Si2Te6 (CST) is a ferromagnetic semiconductor with the Curie temperature (TC) of ~32 K. Here, we have investigated the magnetic properties of CST upon proton irradiation as a function of fluence (1 x 1015, 5 x 1015, 1 x 1016, 5 x 1016, and 1 x 1018 H+/cm2) by employing variable-temperature, variable-field magnetization measurements, and detail how the magnetization, magnetic anisotropy vary as a function of proton fluence across the magnetic phase transition. While the TC remains constant as a function of proton fluence, we observed that the saturation magnetization and magnetic anisotropy diverge at the proton fluence of 5 x 1016 H+/cm2, which is prominent in the ferromagnetic phase, in particular. This work demonstrates that proton irradiation is a feasible method for modifying the magnetic properties and local magnetic interactions of vdWs crystals, which represents a significant step forward in the design of future spintronic and magneto-electronic applications.

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“…Preliminary efforts to control the magnetic properties of CrSBr through synthetic and postsynthetic modification have revealed a large phase space for future exploration. Strain and pressure have both been found to tune the interlayer magnetic interactions, leading to changes in the magnetic ground state and the nature of the field-induced magnetic transition. ,,,, Ion bombardment on crystals or thin flakes flips the sign of interlayer coupling from AFM to FM . Chemically, halide substitution can be used to tune both the intralayer and interlayer magnetic interactions, as well as the magnetocrystalline anisotropy .…”

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confidence: 99%

CrSBr: An Air-Stable, Two-Dimensional Magnetic Semiconductor

Ziebel,

Feuer,

Cox

et al. 2024

Nano Lett.

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The discovery of magnetic order at the 2D limit has sparked new exploration of van der Waals magnets for potential use in spintronics, magnonics, and quantum information applications. However, many of these materials feature low magnetic ordering temperatures and poor air stability, limiting their fabrication into practical devices. In this Mini-Review, we present a promising material for fundamental studies and functional use: CrSBr, an air-stable, two-dimensional magnetic semiconductor. Our discussion highlights experimental research on bulk CrSBr, including quasi-1D semiconducting properties, A-type antiferromagnetic order (T N = 132 K), and strong coupling between its electronic and magnetic properties. We then discuss the behavior of monolayer and few-layer flakes and present a perspective on promising avenues for further studies on CrSBr.

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Ferromagnetic Interlayer Coupling in CrSBr Crystals Irradiated by Ions

Cited by 8 publications

References 33 publications

Strong Exciton–Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr

Strong Exciton–Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr

Proton-fluence dependent magnetic properties of exfoliable quasi-2D van der Waals Cr₂Si₂Te₆ magnet

CrSBr: An Air-Stable, Two-Dimensional Magnetic Semiconductor

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Ferromagnetic Interlayer Coupling in CrSBr Crystals Irradiated by Ions

Cited by 8 publications

References 33 publications

Strong Exciton–Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr

Strong Exciton–Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr

Proton-fluence dependent magnetic properties of exfoliable quasi-2D van der Waals Cr2Si2Te6 magnet

CrSBr: An Air-Stable, Two-Dimensional Magnetic Semiconductor

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Proton-fluence dependent magnetic properties of exfoliable quasi-2D van der Waals Cr₂Si₂Te₆ magnet