We address the theory of magnon-phonon interactions and compute corresponding quasi-particle transport lifetimes in magnetic insulators with focus on yttrium iron garnet at intermediate temperatures from anisotropy- exchange-mediated interactions, latter being derived volume dependence Curie temperature. find general weak effects phonon scattering magnon Gilbert damping macrospin Kittel mode. The lifetime differs shorter wavelengths.

We report on the magnon spectrum of Kitaev-Heisenberg magnets and extract parameters to model a two-dimensional ${\text{CrI}}_{3}$. Our minimal spin Hamiltonian includes contribution stemming from Heisenberg, isotropic exchange, arising Kitaev interaction, anisotropic frustrated exchange. calculations reveal gap that opens at $K$ ${K}^{\ensuremath{'}}$ points topological nature magnons which lead thermal Hall effect. Furthermore, we calculate nanoribbons illustrating corresponding edge states.

Abstract Three-dimensional topological textures have become a topic of intense interest in recent years. This work uses analytical and numerical calculations to determine the magnetostatic field produced by Bloch point (BP) singularity confined magnetic nanosphere. It is observed that BPs hosted nanosphere generate fields with quadrupolar nature. finding interesting because it shows possibility obtaining quadrupole just one particle, unlike other propositions considering arrays elements this...

This study explores the impact of symmetry breaking on ferromagnetic resonance Bloch point (BP) nanospheres. Through standard Fourier analysis, we unveil two distinct oscillation mode groups characterized by low and high frequencies, respectively. Our findings emphasize pivotal role magnetic volume in shaping amplitudes, providing new insights into intricate dynamics BP states. The investigation geometric parameters reveals a quasi-monotonic decrease frequencies as function asymmetry degree...

We have investigated numerically the angular dependence of coercivity and remanence cylindrical diameter modulated Ni80Fe20 nanowires. observed that system always starts reversing its magnetization through thickest segment by means a quite complex reversal process, considering propagation two vortex domain walls. Furthermore, we transition from walls to coherent-mode rotation for thinnest as function angle in which external magnetic field is applied. In addition, obtained non-monotonic...

Abstract We study the relationship between winding number of magnetic merons and Gaussian curvature two-dimensional surfaces. show that positive (negative) curvatures privilege with number. As in case unidimensional domain walls, we found chirality is connected to polarity core. Both effects allow predict topological properties metastable states knowing geometry surface. These features are related recently predicted Dzyaloshinskii-Moriya emergent term curved The presented results at our...

In this work, we have explored the dynamic properties of a Bloch Point singularity confined in diameter-modulated magnetic nanowire. By means micromagnetic simulations, characterized system when varying position at which modulation is located as well response under constant field. We found that presence promotes emergence two distinct modes with energies above lowest energy mode. These are differently affected geometry changes and application However, general result, split for high fields...

The storage of information in long nanowires with a succession independently oriented magnetic segments is great practical use. It requires both the possibility orienting magnetization each segment and stability inscribed regarding spontaneous reversals. A way to separate sectors along wire by short modulations wider than original that acts as valve separating independent orientations. When these two orientations are different, Bloch Point (BP) develops within modulation. precisely this BP...

In this work we introduce an alternating magnetic field generator in a cylindrical nanostructure. This appears due to the rotation of domain wall located at some position, generating region that varies its direction magnetization alternately, thus inducing flux vicinity. phenomenon occurs competition between spin-polarized current and field, which allows control both angular velocity pinning position wall. As proof concept, study particular case diameter-modulated nanowire with along axis...

In this paper, we report the theoretical possibility of generating magnon-polaron excitations through a space-varying magnetic field. The spatial dependence field in Zeeman interaction gives rise to magnon-phonon coupling when gradient is applied, and such depends directly on strength gradient. It also predicted that direction allows control over which phonon polarization couples magnons material. Here, develop calculations for an arbitrary (anti)ferromagnet, are later used numerically study...

In this work we performed a detailed numerical analysis on the static and dynamic properties of magnetic antidot arrays as function their geometry. particular, explored how by varying shape these from circular holes to stadium-shaped holes, can effectively control array. Using micromagnetic simulations evidenced that coercivity is very sensitive antidots, while remanence more robust changes. Furthermore, studied susceptibility systems, finding it possible both position number resonance peaks...

The control of the magnetic properties shapeable devices and manipulation flexible structures by external fields is a keystone future magnetoelectronics-based devices. This work studies elastic magnetoelastic nanodisc that hosts meron as state can be deformed from with positive to negative Gaussian curvature. We show winding number hosted crucial determine curvature sign stable obtained shape. Additionally, we optimum reached depends on geometrical mechanical parameters. It shown an increase...

We have investigated the current-driven domain wall motion in nanostructures comprised of a pair nanotube and nanowire segments. Under certain values external magnetic fields, it is possible to pin vortex transition zone between wire tube explored behavior this under action an electron flow applied opposite direction field. Thus, for fixed field, release pinned simply by increasing intensity current density, or conversely, decreasing When remains due competition density exhibits oscillation...

Skyrmions have become one of the most visited topics during last decade in condensed matter physics. In this work, and by means analytical calculations micromagnetic simulations, we explore effect magnetostatic field generated a magnetic tip on stability skyrmions. Our results show that interaction energy between skyrmion plays fundamental role stabilization Néel skyrmions confined nanodisks, allowing its nucleation annihilation also providing precise control size polarity. Based our...

Through micromagnetic simulations, this work analyzes the possibility of using an array magnetic nanospheres hosting Bloch points (BPs) to compose a system with features trap (MT). We show that BP can be nucleated as metastable configuration in wide range nanosphere radius compared quasi-uniform and vortex state. also stabilized generates quadrupolar field outside nanosphere. Based on fact, we analyze profile different arrays these nanospheres, showing obtained profiles share needed MTs....

In this work, we report the excitation of spin-waves modes in skyrmion clusters hosted Co/Pt nanodots by applying an in-plane magnetic field pulse. The direction at which is applied enables five main that are understood terms only azimuthal-like modes, shown to be strongly dependent on number skyrmions stabilized system. This feature converts present system a mechanism activate and suppress set given turn propose utilized as magnonic key based cluster. Our results could useful manufacturing...

Collinear magnets in honeycomb lattices under the action of time-dependent strains are investigated. Given limits high-frequency periodically varying deformations, we derive an effective Floquet theory for spin system that results emergence a chirality. We find coupling between magnons and chirality depends on details strain such as spatial dependence applied direction. Magnonic fluctuations about ferromagnetic state determined, it is found spatially homogeneous drive magnon into...

We explore the role of spin diffusion conducting electrons in two-dimensional magnetic textures (domain walls and skyrmions) with spatial variation order precession length ${\ensuremath{\lambda}}_{\text{ex}}$. The effect reflects four additional torques that are third derivatives magnetization bilinear ${\ensuremath{\lambda}}_{\text{ex}}$ nonadiabatic parameter ${\ensuremath{\beta}}^{\ensuremath{'}}$. In to study dynamics solitons when these diffusive present, we derive Thiele equation limit...

In this work, we have theoretically explored the spin-waves modes that can be excited in cylindrical nanostructures with wire-tube morphology. Using micromagnetic simulations, found up to 5 resonance whose existence and position depend on geometric parameters of nanostructure. The lower higher frequency remain invariant their as a function size tube segment hole, although intensity increases length wire increases. Other vary frequency, even producing crossover between them. Finally, number...

We propose a magnon-based thermal machine in two-dimensional (2D) magnetic insulators. The thermodynamical cycles are engineered by exposing magnon spin system to baths at different temperatures and tuning the Dzyaloshinskii-Moriya (DM) interaction. find for Otto cycle that gas of magnons converts fraction heat into energy form work, where efficiency is maximized specific values DM, reaching corresponding Carnot efficiency. witness positive negative net work transition during marks onset...