Observation of Topological Hall Effect and Signature of Room Temperature Antiskyrmions in Mn-Ni-Ga D2d Heusler magnets
arXiv:1904.01894 · doi:10.1103/PhysRevB.99.134404
Abstract
Topologically stable nontrivial spin structures, such as skyrmions and antiskyrmions, display a large topological Hall effect owing to their quantized topological charge. Here, we present the finding of a large topological Hall effect beyond room temperature in the tetragonal phase of a Mn-Ni-Ga based ferrimagnetic Heusler shape memory alloy system. The origin of the field induced topological phase, which is also evidenced by the appearance of dips in the ac-susceptibility measurements, is attributed to the presence of magnetic antiskyrmions driven by D2d symmetry of the inverse Heusler tetragonal phase. Detailed micromagnetic simulations asserts that the antiskyrmionic phase is stabilized as a result of interplay among inhomogeneous Dzyaloshinskii-Moriya interaction, the Heisenberg exchange, and the magnetic anisotropy energy. The robustness of the present result is demonstrated by stabilizing the antiskyrmion hosting tetragonal phase up to a temperature as high as 550 K by marginally varying the chemical composition, thereby driving us a step closer to the realization of ferrimagnetic antiskyrmion based racetrack memory.
References in corpus (24)
- Skyrmion Lattice in a Chiral Magnet
- Anomalous Hall effect
- Observation of room temperature magnetic skyrmions and their current-driven dynamics in ultrathin Co films
- Topological Hall effect in the A-phase of MnSi
- Blowing Magnetic Skyrmion Bubbles
- Emergent electrodynamics of skyrmions in a chiral magnet
- Tunable Room Temperature Magnetic Skyrmions in Ir/Fe/Co/Pt Multilayers
- Discovery of Magnetic Antiskyrmions Beyond Room Temperature in Tetragonal Heusler Materials
- Proper Scaling of the Anomalous Hall Effect
- A new class of chiral materials hosting magnetic skyrmions beyond room temperature
- Interface-driven topological Hall effect in SrRuO-SrIrO bilayer
- Current-driven dynamics and inhibition of the skyrmion Hall effect of ferrimagnetic skyrmions in GdFeCo films
- Robust formation of skyrmions and topological Hall effect in epitaxial thin films of MnSi
- Precursor phenomena at the magnetic ordering of the cubic helimagnet FeGe
- Design of compensated ferrimagnetic Heusler alloys for giant tunable exchange bias
- Antiskyrmions stabilized at interfaces by anisotropic Dzyaloshinskii-Moriya interaction
- Magnetic phase diagram of MnSi inferred from magnetization and ac susceptibility
- Néel-type skyrmion lattice in tetragonal polar magnet VOSeO
- A hidden constant in the anomalous Hall effect of a high-purity magnet MnSi
- Robust Zero-Field Skyrmion Formation in FeGe Epitaxial Thin Films
- Large Noncollinearity and Spin Reorientation in the Novel Mn2RhSn Heusler Magnet
- Discretized Topological Hall Effect Emerging from Skyrmions in Constricted Geometry
- Micromagnetics of anti-skyrmions in ultrathin films
- Skyrmion robustness in non-centrosymmetric magnets with axial symmetry: The role of anisotropy and tilted magnetic fields
Cited by in corpus (8)
- Square skyrmion crystal in centrosymmetric itinerant magnets
- Large topological Hall effect near room temperature in noncollinear ferromagnet LaMn2Ge2 single crystal
- Tunable room temperature magnetic skyrmions in centrosymmetric kagome magnet MnGaSn
- Robust topological Hall effect driven by tunable noncoplanar magnetic state in Mn-Pt-In inverse tetragonal Heusler alloys
- Giant topological Hall effect in centrosymmetric tetragonal Mn2-xZnxSb
- An ac-susceptibility study of magnetic relaxation phenomena in the antiskyrmion hosting tetragonal Mn-Pt(Pd)-Sn system
- Spin order dependent skyrmion stabilization in MnFeCoGe hexagonal magnets
- Bounds and anomalies of inhomogeneous anomalous Hall effects