Observation of Colossal Topological Hall Effect in Noncoplanar Ferromagnet Cr₅Te₆ Thin Films

Abstract

The topological Hall effect (THE) is critical to the exploration of the spin chirality generated by the real‐space Berry curvature, which has attracted worldwide attention for its prospective applications in spintronic devices. However, the prominent THE remains elusive at room temperature, which severely restricts the practical integration of chiral spin textures. Here, a colossal intrinsic THE is showed up to ≈1.6 µΩ cm in large‐area ferromagnet Cr5Te6 thin films epitaxially grown by pulsed laser deposition. Such a THE can be maintained until 270 K, which is attributed to the field‐stimulated noncoplanar spin textures induced by the interaction of the in‐plane ferromagnet and antiferromagnet infrastructures. The first‐principles calculations further verify the considerable Dzyaloshinskii‐Moriya interaction in Cr5Te6. This work not only paves the way for robust chiral spin textures near room temperature in large‐area low‐dimensional ferromagnetic films for practical applications, but also facilitates the development of high‐density and dissipationless spintronic devices.

Topological Hall Effect in (Mn1−xFex)3.25Ge (x = 0.4) Hexagonal Magnet

“…We found a clear difference between the calculated and experimental anomalous Hall resistivity at low-field regions in the temperature range of 10-200 K as shown in Figure 3a-g. We would like to mention here that in the present system, we did not observe the hysteresis in the Hall resistivity curves, and therefore, the artifact in THE arising from the superposition of major and minor loops [51,52] is not possible in our case and hence the observed THE in the present compound is genuine, not influenced by artifact. Figure 4 shows the field-dependent ρ T at different temperatures.…”

Experimental and computational Insights Into the magnetic anisotropy and magnetic behaviour of layered room-temperature ferromagnet Cr1.38Te2

“…Previous neutron diffraction studies on Cr 1.5 Te 2 suggested a mixed spin-state of Cr 2+ (Cr1) and Cr 3+ (Cr2), leading to a canted spin structure due to the ferromagnetic components of Cr1 and Cr2 tilted by 30 o and 38 o , respectively, about the a-axis and the antiferromagnetic (AF) components of Cr1 and Cr2 are aligned in the bcplane [42]. Therefore, the competition between FM and AFM phases could be playing a vital role in garnering the multiple magnetic transitions, in addition to the canted spin structure, in these systems [43,44]. The inverse susceptibility (1/χ) plotted as a function of temperature, as shown in the inset of figures 2(a) and (b), for both field directions follow the Curie-Weiss law χ(T) = C/(T − T p ).…”

Critical behavior of quasi-two-dimensional ferromagnet Cr1.04Te2

“…In recent years, the binary chromium chalcogenides have drawn significant interest due to their outstanding magnetic, transport, and optical properties. [14][15][16][17] Notably, not all divalent chromium sulfides exhibit ferromagnetism; tellurides are typically ferromagnetic, whereas sulfides and selenides often manifest as antiferromagnetic metals or semiconductors. [18,19] These tellurides, with their T C around room temperature, stand out as potential highperformance candidates for spintronic devices.…”

“…[25,26] Recently, gi-ant topological Hall effect (THE) [27,28] and spin-orbit torque devices [29,30] have been realized in CrTe 2 -based all vdW heterostructures. More intriguingly, the vdW gaps in CrTe 2 readily accommodate Cr atoms in various concentrations through the self-intercalation process, [31] resulting in a rich family of binary chromium tellurides, Cr x Te 2 , such as CrTe, [32] Cr 0.87 Te, [33] Cr 5 Te 6 , [15] Cr 4 Te 5 , [34] Cr 3 Te 4 , [35] Cr 2 Te 3 , [36] Cr 5 Te 8 , [16] Cr 0.62 Te, [37] Cr 1.2 Te 2 , [38,39] Cr 4.14 Te 8 , [40] and CrTe 3 . [41] The quantity of Cr atoms intercalated significantly affects the crystal structure and T C , offering an additional way to modify their properties.…”