Real Space Imaging of Spin Stripe Domain Fluctuations in a Complex Oxide

Wu, Luhua; Shen, Yao; Barbour, Andi; Wang, Wei; Prabhakaran, D.; Boothroyd, A. T.; Mazzoli, Claudio; Tranquada, J. M.; Dean, M. P. M.; Robinson, Ian

doi:10.1103/physrevlett.127.275301

Cited by 8 publications

(2 citation statements)

References 45 publications

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“…5(b). We note that this lowering of symmetry to monoclinic is a tendency observed in numerous square-net systems that have charge density wave modulations [38][39][40][41][42]. Importantly it is worth noticing that for both monoclinic space groups, the symmetry of the CDW (without considering the magnetic degrees of freedom) is now chiral, having point group 222 or 2.…”

Section: Structural and Symmetry Changesmentioning

confidence: 69%

Spontaneous reversal of spin chirality and competing phases in the topological magnet EuAl4

Vibhakar,

Khalyavin,

Orlandi

et al. 2024

Preprint

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Materials exhibiting a spontaneous reversal of spin chirality have the potential to drive the widespread adoption of chiral magnets in spintronic devices. Unlike the majority of chiral magnets that require the application of an external field to reverse the spin chirality, we observed the spin chirality to spontaneously reverse in the topological magnet EuAl4. Using resonant magnetic x-ray scattering we demonstrate that all four magnetic phases in EuAl4 are single-k, where the first two magnetic phases are characterized by spin density wave order and the last two by helical spin order. We show a single spin chirality was stabilised across the 1mm2 sample, and that the reversal of spin chirality occurred whilst maintaining a helical magnetic structure. At the onset of the helical magnetic order, the crystal symmetry lowers to a chiral monoclinic space group, explaining the asymmetry in the chiral spin order, and establishing a mechanism by which the spin chirality could reverse via magnetostructural coupling.

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Section: Structural and Symmetry Changesmentioning

confidence: 69%

Spontaneous reversal of spin chirality and competing phases in the topological magnet EuAl4

Vibhakar,

Khalyavin,

Orlandi

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The antiferromagnetic domain sizes reported in these experiments are all resolution limited, showing that the antiferromagnetic ordering is strong. As a notoriously difficult task, imaging antiferromagnetic structure is accessible to some existing microscopy techniques, for example, x-ray photoemission electron microscopy [19], spin-polarized scanning tunneling microscopy [20], propagation-based phase contrast technique [21], Bragg ptychography [22], and optical second-harmonic generation technique [23,24]. They mainly provide two-dimensional structure information of magnetic materials.…”

mentioning

confidence: 99%

Anisotropy of antiferromagnetic domains in a spin-orbit Mott insulator

Wang

Assefa

et al. 2023

Phys. Rev. B

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The temperature-dependent behavior of magnetic domains plays an essential role in the magnetic properties of materials, leading to widespread applications. However, experimental methods to access the three-dimensional (3D) magnetic domain structures are very limited, especially for antiferromagnets. Over the past decades, the spin-orbit Mott insulator iridate Sr 2 IrO 4 has attracted particular attention because of its interesting magnetic structure and analogy to superconducting cuprates. Here, we apply resonant x-ray magnetic Bragg coherent diffraction imaging to track the real-space 3D evolution of antiferromagnetic ordering inside a Sr 2 IrO 4 single crystal as a function of temperature, finding that the antiferromagnetic domain shows anisotropic changes. The anisotropy of the domain shape reveals the underlying anisotropy of the antiferromagnetic coupling strength within Sr 2 IrO 4 . These results demonstrate the high potential significance of 3D domain imaging in magnetism research.

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Spontaneous reversal of spin chirality and competing phases in the topological magnet EuAl4

Vibhakar,

Khalyavin,

Orlandi

et al. 2024

Commun Phys

View full text Add to dashboard Cite

Materials exhibiting a spontaneous reversal of spin chirality have the potential to drive the widespread adoption of chiral magnets in spintronic devices. Unlike the majority of chiral magnets that require the application of an external field to reverse the spin chirality, we observe the spin chirality to spontaneously reverse in the topological magnet EuAl4. Using resonant elastic x-ray scattering we demonstrate that all four magnetic phases in EuAl4 are single-k, where the first two magnetic phases are characterized by spin density wave order and the last two by helical spin order. A single spin chirality was stabilised across the 1mm2 sample, and the reversal of spin chirality occurred whilst maintaining a helical magnetic structure. At the onset of the helical magnetism, the crystal symmetry lowers to a chiral monoclinic space group, explaining the asymmetry in the chiral spin order, and establishing a mechanism by which the spin chirality could reverse via magnetostructural coupling.

show abstract

Real Space Imaging of Spin Stripe Domain Fluctuations in a Complex Oxide

Cited by 8 publications

References 45 publications

Spontaneous reversal of spin chirality and competing phases in the topological magnet EuAl4

Spontaneous reversal of spin chirality and competing phases in the topological magnet EuAl4

Anisotropy of antiferromagnetic domains in a spin-orbit Mott insulator

Spontaneous reversal of spin chirality and competing phases in the topological magnet EuAl4

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