Emergence of Nontrivial Spin Textures in Frustrated Van Der Waals Ferromagnets

Abstract

In this work, first principles ground state calculations are combined with the dynamic evolution of a classical spin Hamiltonian to study the metamagnetic transitions associated with the field dependence of magnetic properties in frustrated van der Waals ferromagnets. Dynamically stabilized spin textures are obtained relative to the direction of spin quantization as stochastic solutions of the Landau–Lifshitz–Gilbert–Slonczewski equation under the flow of the spin current. By explicitly considering the spin signatures that arise from geometrical frustrations at interfaces, we may observe the emergence of a magnetic skyrmion spin texture and characterize the formation under competing internal fields. The analysis of coercivity and magnetic hysteresis reveals a dynamic switch from a soft to hard magnetic configuration when considering the spin Hall effect on the skyrmion. It is found that heavy metals in capped multilayer heterostructure stacks host field-tunable spiral skyrmions that could serve as unique channels for carrier transport. The results are discussed to show the possibility of using dynamically switchable magnetic bits to read and write data without the need for a spin transfer torque. These results offer insight to the spin transport signatures that dynamically arise from metamagnetic transitions in spintronic devices.

Quantum Phase Transition in the Spin Transport Properties of Ferromagnetic Metal-Insulator-Metal Hybrid Materials

“…Recently, we used the external magnetic field to break the time-reversal symmetry due to the strong SOC by modeling the spin Hall effect in related heterostructures that contain Pt and Pd. By mimicking the longitudinal flow of the spin current, the spin texture of the carrier transport phase is clarified as a magnetic skyrmion [ 70 ].…”

“…Under strong SOC, the effect of applying a perpendicular external magnetic field to the heterostructure leads to the emergence of robust magnetic skyrmion spin textures in artificially stacked multilayers [ 70 ]. We have shown recently in Ref.…”

“…Thus, external bias fields such as gate potential, external electric, and magnetic field in pMTJs [ 82 , 83 , 84 ] is likely to create the magnetoelectric couplings observed herein to mediate the emergence of exotic collective phenomena. Some of such phenomena include spin-polarized charge density wave phase [ 21 ], the emergence of robust magnetic skyrmion spin textures [ 70 ], and formation of a quantum-fluid phase at distinct quantum phase transition points [ 79 ]. In Section 3.3 , we analyse the observables of the electronic structure that uniquely characterize the proximity-induced magnetoelectric coupling to clarify the nature of the observed QPT.…”

Electrodynamics of Topologically Ordered Quantum Phases in Dirac Materials

“…We emphasize that the presence of coupled heterobilayer interfaces in such coupled heterostructure introduces long-ranged structural disorder which guarantees the broken spatial inversion symmetry expected in bulk Dirac materials. Recently, the use of multilayer heterostructures that incorporate Dirac materials in 2D (or monolayer) form for spintronic memory applications has been demonstrated [78]. The calculations are tractable using TaAs and graphene models of Dirac materials because they retain their chiral edge states in nano nanocluster geometries.…”

Suppression Effect on the Domain Wall Tilting in Synthetic Antiferromagnetic Racetrack Driven by the Spin–Orbit Torque

“…These stray fields on the racetrack can be eliminated by employing antiferromagnetic (AFM) materials, [6,7] such as IrMn, MnPt, and FeMn. [8][9][10] However, the magnetic states of AFM materials are difficult to manipulate and detect due to near-zero magnetization. [11] Comparatively, the synthetic antiferromagnetic (SAF) structures, formed with two interlayer-exchange-coupled ferromagnetic layers via a nonmagnetic spacer, [12] are ideal for performing racetrack memories with the advantages of manipulation and detection of magnetic states.…”