Low-energy magnons in the chiral ferrimagnet 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">OSeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
: A coarse-grained approach

Luo, Yi; Marcus, Guy; Trump, Benjamin A.; Kindervater, J.; Stone, M. B.; Rodríguez-Rivera, J. A.; Qiu, Yiming; McQueen, Tyrel M.; Tchernyshyov, Oleg; Broholm, C.

doi:10.1103/physrevb.101.144411

Cited by 7 publications

(4 citation statements)

References 43 publications

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“…Experimental detection of such change could serve as indirect evidence in favor of the existence of antiferromagnetic cantings in this crystal. It is worth noting that although the magnon spectrum of the Cu 2 OSeO 3 crystal has been studied repeatedly [53][54][55][56], no one has consciously studied the change in the wavenumber in a strong magnetic field.…”

Section: Discussionmentioning

confidence: 99%

The influence of antiferromagnetic spin cantings on the magnetic helix pitch in cubic helimagnets

Chizhikov,

Dmitrienko

2024

J. Phys.: Condens. Matter

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In cubic helimagnets MnSi and Cu2OSeO3 with their nearly isotropic magnetic properties, the magnetic structure undergoes helical deformation, which is almost completely determined by the helicoid wavenumber k = D / J, where magnetization field stiffness J is associated with isotropic spin exchange, and D is a pseudoscalar value characterizing the antisymmetric Dzyaloshinskii-Moriya (DM) interaction. Another magnetic feature of these crystals, also caused by the DM interactions, are antiferromagnetic spin cantings, similar to the ferromagnetic cantings responsible for the phenomenon of weak ferromagnetism. Here we show that cantings can strongly influence the helical order through the value of the parameter D. Changing the cantings in a strong magnetic field is predicted to affect the magnon spectrum of the crystals.

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Section: Discussionmentioning

confidence: 99%

The influence of antiferromagnetic spin cantings on the magnetic helix pitch in cubic helimagnets

Chizhikov,

Dmitrienko

2024

J. Phys.: Condens. Matter

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“…Polar magnets display an intriguing spectrum of novel physical properties, from multiferroics to vortex-like spin states, and associated nontrivial topology spin physics. − Topologically distinct spin textures, such as skyrmions, featuring a nanometric-sized particle nature are anticipated to play an important role in several areas, from new knowledge in electronic and magnetic states of matter to unconventional computing and high-density low-power magnetic memory applications. − Underpinning much of this behavior is the ability of magnetic polar compounds, in which spatial inversion symmetry is broken, to stabilize the Dzyaloshinskii–Moriya (DM) exchange interaction supported by strong coupling of spin, orbital, and lattice degrees of freedom. ,,,, …”

Section: Introductionmentioning

confidence: 99%

Spin and Orbital Effects on Asymmetric Exchange Interaction in Polar Magnets: M(IO₃)₂ (M = Cu and Mn)

et al. 2021

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Magnetic polar materials feature an astonishing range of physical properties, such as magnetoelectric coupling, chiral spin textures, and related new spin topology physics. This is primarily attributable to their lack of space inversion symmetry in conjunction with unpaired electrons, potentially facilitating an asymmetric Dzyaloshinskii−Moriya (DM) exchange interaction supported by spin−orbital and electron−lattice coupling. However, engineering the appropriate ensemble of coupled degrees of freedom necessary for enhanced DM exchange has remained elusive for polar magnets. Here, we study how spin and orbital components influence the capability of promoting the magnetic interaction by studying two magnetic polar materials, α-Cu(IO 3 ) 2 ( 2 D) and Mn(IO 3 ) 2 ( 6 S), and connecting their electronic and magnetic properties with their structures. The chemically controlled low-temperature synthesis of these complexes resulted in pure polycrystalline samples, providing a viable pathway to prepare bulk forms of transition-metal iodates. Rietveld refinements of the powder synchrotron X-ray diffraction data reveal that these materials exhibit different crystal structures but crystallize in the same polar and chiral P2 1 space group, giving rise to an electric polarization along the b-axis direction. The presence and absence of an evident phase transition to a possible topologically distinct state observed in α-Cu(IO 3 ) 2 and Mn(IO 3 ) 2 , respectively, imply the important role of spin−orbit coupling. Neutron diffraction experiments reveal helpful insights into the magnetic ground state of these materials. While the long-wavelength incommensurability of α-Cu(IO 3 ) 2 is in harmony with sizable asymmetric DM interaction and low dimensionality of the electronic structure, the commensurate stripe AFM ground state of Mn(IO 3 ) 2 is attributed to negligible DM exchange and isotropic orbital overlapping. The work demonstrates connections between combined spin and orbital effects, magnetic coupling dimensionality, and DM exchange, providing a worthwhile approach for tuning asymmetric interaction, which promotes evolution of topologically distinct spin phases.

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“…Magnon band structures are nontrivial in chiral magnets because of bulk Dzyaloshinskii-Moriya interaction (DMI) [1][2][3][4][5][6]. As a consequence of the asymmetric exchange interaction, bulk DMI introduces non-reciprocity for the spin waves [5,[7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Confined dipole and exchange spin waves in a bulk chiral magnet with Dzyaloshinskii-Moriya interaction

Che,

Stasinopoulos,

Mucchietto

et al. 2021

Preprint

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The Dzyaloshinskii-Moriya interaction (DMI) has an impact on excited spin waves in the chiral magnet Cu2OSeO3 by means of introducing asymmetry on their dispersion relations. The confined eigenmodes of a chiral magnet are hence no longer the conventional standing spin waves. Here we report a combined experimental and micromagnetic modeling study by broadband microwave spectroscopy we observe confined spin waves up to eleventh order in bulk Cu2OSeO3 in the fieldpolarized state. In micromagnetic simulations we find similarly rich spectra. They indicate the simultaneous excitation of both dipole-and exchange-dominated spin waves with wavelengths down to (47.2 ± 0.05) nm attributed to the exchange interaction modulation. Our results suggest DMI to be effective to create exchange spin waves in a bulk sample without the challenging nanofabrication and thereby to explore their scattering with noncollinear spin textures.

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Low-energy magnons in the chiral ferrimagnet Cu2OSeO3 : A coarse-grained approach

Cited by 7 publications

References 43 publications

The influence of antiferromagnetic spin cantings on the magnetic helix pitch in cubic helimagnets

The influence of antiferromagnetic spin cantings on the magnetic helix pitch in cubic helimagnets

Spin and Orbital Effects on Asymmetric Exchange Interaction in Polar Magnets: M(IO₃)₂ (M = Cu and Mn)

Confined dipole and exchange spin waves in a bulk chiral magnet with Dzyaloshinskii-Moriya interaction

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Low-energy magnons in the chiral ferrimagnet Cu2OSeO3 : A coarse-grained approach

Cited by 7 publications

References 43 publications

The influence of antiferromagnetic spin cantings on the magnetic helix pitch in cubic helimagnets

The influence of antiferromagnetic spin cantings on the magnetic helix pitch in cubic helimagnets

Spin and Orbital Effects on Asymmetric Exchange Interaction in Polar Magnets: M(IO3)2 (M = Cu and Mn)

Confined dipole and exchange spin waves in a bulk chiral magnet with Dzyaloshinskii-Moriya interaction

Contact Info

Product

Resources

About

Spin and Orbital Effects on Asymmetric Exchange Interaction in Polar Magnets: M(IO₃)₂ (M = Cu and Mn)