Time-dependent strain-tuned topological magnon phase transition

Vidal-Silva, N.; Troncoso, Roberto E.

doi:10.1103/physrevb.106.224401

Cited by 4 publications

(2 citation statements)

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“…Further examples include strained antiferromagnetic materials that exhibit different responses to external fields [92] and other materials where strain affects the magnetic properties [93,94]. Finally, recent theoretical studies suggest topological magnon phase transitions tuned by time-dependent strains in 2D materials [95]. In binary alloys like Fe-Cr the formation of stable precipitates is known to occur at certain concentrations, and this would dynamically affect magnetic properties [96], as well as magnetically driven phase transformation [97].…”

Section: Discussionmentioning

confidence: 99%

Feasibility analysis towards the simulation of hysteresis with spin-lattice dynamics

dos Santos,

Romá,

Tranchida

et al. 2023

Phys. Rev. B

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We use spin-lattice dynamics simulations to study the possibility of modeling the magnetic hysteresis behavior of a ferromagnetic material. The temporal evolution of the magnetic and mechanical degrees of freedom is obtained through a set of two coupled Langevin equations. Hysteresis loops are calculated for different angles between the external field and the magnetocrystalline anisotropy axes. The influence of several relevant parameters is studied, including the field frequency, magnetic damping, magnetic anisotropy (magnitude and type), magnetic exchange, and system size. The role played by a moving lattice is also discussed. For a perfect bulk ferromagnetic system we find that, at low temperatures, the exchange and lattice dynamics barely affect the loops, while the field frequency and magnetic damping have a large effect on it. The influence of the anisotropy magnitude and symmetry are found to follow the expected behavior. We show that a careful choice of simulation parameters allows for an excellent agreement between the spin-lattice dynamics measurements and the paradigmatic Stoner-Wohlfarth model. Furthermore, we extend this analysis to intermediate and high temperatures for the perfect bulk system and for spherical nanoparticles, with and without defects, reaching values close to the Curie temperature. In this temperature range, we find that lattice dynamics has a greater role on the magnetic behavior, especially in the evolution of the defective samples. The present study opens the possibility for more accurate inclusion of lattice defects and thermal effects in hysteresis simulations.

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Section: Discussionmentioning

confidence: 99%

Feasibility analysis towards the simulation of hysteresis with spin-lattice dynamics

dos Santos,

Romá,

Tranchida

et al. 2023

Phys. Rev. B

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“…The solution of the Dirac equation shows that despite the absence of a Hall current, a spin-Hall current is a natural consequence for such a topology [53]. Other works have studied topological phases arising from strain and its interplay with interactions in graphene [100,116,136,[150][151][152]. Buckling was also shown to allow control of topological edge states via electric fields in germanene [153].…”

Section: Flat Electronic Bands and Electron-electron Correlations In ...mentioning

confidence: 99%

Mechanical, electronic, optical, piezoelectric and ferroic properties of strained graphene and other strained monolayers and multilayers: an update

Naumis,

Herrera,

Poudel

et al. 2023

Rep. Prog. Phys.

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This is an update of a previous review on the subject \cite{Naumis_2017}. Experimental and theoretical advances for straining graphene and other metallic, insulating, ferroelectric, ferroelastic, ferromagnetic and multiferroic 2D materials have been considered. Specific topics of discussion include: (i) methods to induce valley and sublattice polarisation ($\mathbf{P}$) in graphene, (ii) time-dependent strain and its impact on graphene's electronic properties, (iii) the role of local and global strain on superconductivity and other highly correlated and/or topological phases of graphene, inducing polarisation $\mathbf{P}$ on hexagonal boron nitride monolayers {\it via} strain, (iv) measuring strain, and modifying through strain the optoelectronic properties of transition metal dichalcogenides, (v) ferroic 2D materials with intrinsic elastic ($\sigma$), electric ($\mathbf{P}$) and magnetic ($\mathbf{M}$) polarisation under strain, as well as incipient 2D multiferroics and (vi) moir'e bilayers exhibiting flat electronic bands and exotic quantum phase diagrams, and other bilayer or few-layer systems exhibiting ferroic orders tunable by rotations and shear strain. The review features the extremely recent experimental realizations of a tunable two-dimensional Quantum Spin Hall effect in germanene, of monoelemental 2D ferroelectric bismuth, and 2D multiferroic NiI$_2$. The document was structured for a discussion of effects taking place in monolayers first, followed by discussions concerning bilayers and few-layers, and it represents a fresh and up-to-date overview of exciting and newest developments on the fast-paced field of 2D materials.

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