Magnetic Phase Transitions and Magnetoelastic Coupling in a Two-Dimensional Stripy Antiferromagnet

Gu, Pingfan; Sun, Yujia; Wang, Wenwen; Peng, Yuxuan; Zhu, Yongfeng; Cheng, Xing; Yuan, Kai; Lyu, Chao; Liu, Xuelu; Tan, Qinghai; Zhang, Qinghua; Gu, Lin; Wang, Zhi; Wang, Hanwen; Han, Zheng; Watanabe, Kenji; Taniguchi, Takashi; Yang, Jinbo; Zhang, Jun; Ji, Wei; Tan, Ping‐Heng; Yu, Yongqin

doi:10.1021/acs.nanolett.1c04373

Cited by 28 publications

(42 citation statements)

References 36 publications

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“…5d , one can see that the system undergoes three magnetic phase transitions (at H 1 , H 2 , and H 3 , respectively), which is in agreement with the report elsewhere 43 , 44 . The CrOCl crystal has a monoclinic phase below the Néel temperature, and exhibits a so-called stripy AF-↑↑↓↓ magnetic ground state due to magnetoelastic coupling 44 . It then reaches a ferrimagnetic phase ↑↑↑↓↓ above H 3 .…”

Section: Discussionsupporting

confidence: 91%

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A monolithically sculpted van der Waals nano-opto-electro-mechanical coupler

et al. 2022

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The nano-opto-electro-mechanical systems (NOEMS) are a class of hybrid solid devices that hold promises in both classical and quantum manipulations of the interplay between one or more degrees of freedom in optical, electrical and mechanical modes. To date, studies of NOEMS using van der Waals (vdW) heterostructures are very limited, although vdW materials are known for emerging phenomena such as spin, valley, and topological physics. Here, we devise a universal method to easily and robustly fabricate vdW heterostructures into an architecture that hosts opto-electro-mechanical couplings in one single device. We demonstrated several functionalities, including nano-mechanical resonator, vacuum channel diodes, and ultrafast thermo-radiator, using monolithically sculpted graphene NOEMS as a platform. Optical readout of electric and magnetic field tuning of mechanical resonance in a CrOCl/graphene vdW NOEMS is further demonstrated. Our results suggest that the introduction of the vdW heterostructure into the NOEMS family will be of particular potential for the development of novel lab-on-a-chip systems.

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Section: Discussionsupporting

confidence: 91%

“…Meanwhile, magnetic field-driven redshift of mechanical resonance in the anti-ferromagnetic (AF) vdW insulators from AF to ferromagnetic transition in CrI 3 42 . Here, we adopt an AF insulator CrOCl, which is known to exhibit enriched magnetic phase transitions 43 , 44 .…”

Section: Discussionmentioning

confidence: 99%

A monolithically sculpted van der Waals nano-opto-electro-mechanical coupler

et al. 2022

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“…2c), where the current polarization ρ is defined as ρ = (R up − R down )/(R up + R down ). Apart from the hysteresis loop induced by extrinsic charge traps at low voltages 36 , ρ exhibits nonzero values below ∼12 K, perfectly coincides with the Néel temperature of exfoliated CrOCl 27 . Clockwise hysteresis results in a negative ρ under positive bias and a positive ρ under negative bias.…”

Section: Resultssupporting

confidence: 61%

“…The air-stable van der Waals insulator CrOCl, with a stripy antiferromagnetic ground state and thus both broken rotational symmetry and translation symmetry perpendicular to the stripes, is a potential candidate to exhibit the intrinsic 2D ME effect. We have verified the magnetic phase transitions and magnetoelastic coupling effect of CrOCl in the 2D limit 27 . Additionally, exotic quantum Hall effects 28 and insulator phases 29 were observed in the graphene/CrOCl heterostructures.…”

Section: Introductionmentioning

confidence: 53%

“…A k-mesh of 10 × 14 × 4 was adopted to sample the first Brillouin zone of the conventional unit cell of CrOCl bulk. The U and J values of the on-site Coulomb interaction of the Cr d orbitals are 3.0 eV and 1.0 eV, respectively, as revealed by a linear response method 42 and comparison with the experimental results 27 . These values are comparable to those adopted in modeling CrSCl 43 and CrI 3 44 .…”

Section: Methodsmentioning

confidence: 82%

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Multi-state Data Storage in a Two-dimensional Stripy Antiferromagnet Implemented by Magnetoelectric Effect

Dong

et al. 2022

Preprint

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A promising approach to the next generation of low-power, functional, and energy-efficient electronics relies on novel materials with coupled magnetic and electric degrees of freedom. In particular, stripy antiferromagnets often exhibit broken crystal and magnetic symmetries, which may bring about the magnetoelectric (ME) effect and enable the manipulation of intriguing properties and functionalities by electrical means. The demand for expanding the boundaries of data storage and processing technologies has led to the development of spintronics toward two-dimensional (2D) platforms. This work reports the ME effect in the 2D stripy antiferromagnetic insulator CrOCl down to a single layer. By measuring the tunneling resistance of CrOCl on the parameter space of temperature, magnetic field, and applied voltage, we verified the ME coupling down to the 2D limit and unraveled its mechanism. Utilizing the multi-stable states and ME coupling at magnetic phase transitions, we realize multi-state data storage in the tunneling devices. Our work not only advances the fundamental understanding of spin-charge coupling, but also demonstrates the great potential of 2D antiferromagnetic materials to deliver devices and circuits beyond the traditional binary operations.

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Abnormal Linear Dichroism in Anisotropic Van der Waals Crystal CrOCl Revealed by Phase‐Dependent Polarized Raman Scattering

Liu,

Zheng,

Zhang

et al. 2024

Advanced Optical Materials

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Within angle‐resolved polarized Raman spectroscopy (ARPRS) experiments, ensuring accurate configurations is crucial for obtaining reliable results, especially when dealing with anisotropic materials like CrOCl with anisotropic crystal structure and phonon properties. However, comprehensive understanding of phase‐dependent ARPRS and the calibration of phase angle on anisotropic phonon modes from a crystallographic perspective are still lacking. Herein, detailed investigation on phase‐dependent ARPRS and looked into the anisotropic photo‐phonon interaction in CrOCl through in situ ARPRS is conducted. The Raman tensors and crystal orientation are acquired under two typical configurations. Phase‐dependent ARPRS are thoroughly analyzed for the calibration of analyzer deviation. The anomalous anisotropic response in phase‐dependent ARPRS is closely related to the intrinsic linear dichroism (LD) effect in CrOCl, which is further confirmed by angle‐resolved polarization absorption. Moreover, the strong localized rules for various parallel energy bands of CrOCl have generated anomalous LD conversion effect near 470 nm, which expands the potential application of CrOCl in polarization‐wavelength selected devices. This findings can offer in‐depth comprehension on the anisotropic phonon physics of CrOCl and a feasible approach to utilize phase‐dependent ARPRS for probing the undiscovered abundant photo‐induced effects in low‐symmetry 2D materials.

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Magnetic Phase Transitions and Magnetoelastic Coupling in a Two-Dimensional Stripy Antiferromagnet

Cited by 28 publications

References 36 publications

A monolithically sculpted van der Waals nano-opto-electro-mechanical coupler

A monolithically sculpted van der Waals nano-opto-electro-mechanical coupler

Multi-state Data Storage in a Two-dimensional Stripy Antiferromagnet Implemented by Magnetoelectric Effect

Abnormal Linear Dichroism in Anisotropic Van der Waals Crystal CrOCl Revealed by Phase‐Dependent Polarized Raman Scattering

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