arXiv subjects

S. Artyukhin

Publications and source records attributed to S. Artyukhin.

6 recordsLinked to original sources

arXiv2026

Rocket-like dynamics of ferrimagnetic domain walls in graded materials

Domain wall motion underpins emerging spintronic technologies, such as high-speed racetrack devices and THz logic, and accelerating walls quickly is a key challenge on the path to faster devices. Recent experimental advances introduced magnetic materials with non-uniform composition, allowing angular momentum compensation points and fast domain wall motion, although acceleration of domain walls in these materials remains poorly understood. Here, we show that spatial variation of exchange and anisotropy not only pushes the wall towards lower wall surface tension region, but also modifies its inertial mass, giving rise to a variable-mass relativistic dynamics. We find another force, originating from the magnon velocity gradient, that dominates as the wall velocity approaches the magnon speed. Our results identify domain walls in nonuniform magnets as a playground for relativistic physics with variable mass and limiting speed.https://info.arxiv.org/help/prep#comments

cond-mat.mes-hall↗

arXiv2026

Highly controllable switching pathways in multiferroic GdMn$_2$O$_5$

Controlling magnetic moments using electric fields remains a central challenge in spintronics. Multiferroics, where magnetic and electric orders coexist, may be a natural platform for such control, but progress has been limited because interactions between these orders are typically too weak to overcome the energy barriers between magnetic states. A recently demonstrated topologically protected switching circumvents this limitation by exploiting reduced barriers at a phase transition. Nevertheless, the conditions enabling this phenomenon remain elusive and electric field control is poorly understood. Here, we experimentally map the energy landscape by tracking transitions in GdMn$_2$O$_5$ under combined electric and magnetic fields. The experiments reveal that the switching pathways can be controlled by the electric field. A minimal theoretical model captures the observed behavior, identifies the parameter space where switching paths are sensitive to small perturbations and reveals design principles for implementing topological switching in other materials.

cond-mat.mtrl-sci↗

arXiv2025

Competition Between Multiferroic and Magnetic Soliton Lattice States in DyFeO$_3$

Simultaneous breaking of time reversal and inversion symmetries in multiferroics couples ferroelectricity to magnetism and is a source of unusual physical phenomena that can be used in next-generation electronic devices. A notable example is DyFeO$_3$, which under applied magnetic fields exhibits a giant linear magnetoelectric response and a large spontaneous electric polarization induced by coexisting orders of Fe and Dy spins. Here, we use high-resolution neutron diffraction to show that at zero field DyFeO$_3$ hosts an incommensurate magnetic soliton lattice formed by spatially ordered Dy domain walls with an average domain size of 231(8) Å. The long-ranged interaction between the domain walls is mediated by magnons propagating through the Fe subsystem and is analogous to the Yukawa force in particle physics. An applied magnetic field destroys the long-ranged incommensurate order, unlocks the linear magnetoelectric response and stabilizes the ferroelectric state. The magnetic domain walls are electrically charged and the soliton array dimerizes when both electric and magnetic fields are applied. Numerical simulations with experimental parameters suggest, that the generic competition between the ferroelectric and incommensurate states can be effectively controlled by an applied electric field.

cond-mat.str-el↗

arXiv2015

Successive magnetic field-induced transitions and colossal magnetoelectric effect in Ni$_{3}$TeO$_{6}$

We report the discovery of a metamagnetic phase transition in a polar antiferromagnet Ni$_3$TeO$_6$ that occurs at 52 T. The new phase transition accompanies a colossal magnetoelectric effect, with a magnetic-field-induced polarization change of 0.3 $μ$C/cm$^2$, a value that is 4 times larger than for the spin-flop transition at 9 T in the same material, and also comparable to the largest magnetically-induced polarization changes observed to date. Via density-functional calculations we construct a full microscopic model that describes the data. We model the spin structures in all fields and clarify the physics behind the 52 T transition. The high-field transition involves a competition between multiple different exchange interactions which drives the polarization change through the exchange-striction mechanism. The resultant spin structure is rather counter-intuitive and complex, thus providing new insights on design principles for materials with strong magnetoelectric coupling.

cond-mat.mtrl-sci↗

arXiv2013

Dimerization-Induced Cross-Layer Quasi-Two-Dimensionality in Metallic Iridate IrTe2

The crystal structure of layered metal IrTe2 is determined using single-crystal x-ray diffraction. At T=220 K, it exhibits Ir and Te dimers forming a valence-bond crystal. Electronic structure calculations reveal an intriguing quasi-two-dimensional electronic state, with planes of reduced density of states cutting diagonally through the Ir and Te layers. These planes are formed by the Ir and Te dimers, which exhibit a signature of covalent bonding character development. Evidence for significant charge disproportionation among the dimerized and non-dimerized Ir (charge order) is also presented.

cond-mat.str-el↗

arXiv2011

Magnetic excitations in the low-temperature ferroelectric phase of multiferroic YMn2O5 using inelastic neutron scattering

We studied magnetic excitations in a low-temperature ferroelectric phase of the multiferroic YMn2O5 using inelastic neutron scattering (INS). We identify low-energy magnon modes and establish a correspondence between the magnon peaks observed by INS and electromagnon peaks observed in optical absorption [1]. Furthermore, we explain the microscopic mechanism, which results in the lowest-energy electromagnon peak, by comparing the inelastic neutron spectral weight with the polarization in the commensurate ferroelectric phase.

cond-mat.str-el↗