Robust spin glass state with exceptional thermal stability in a chemically complex alloy

Observation of Topological Hall Effect in a Chemically Complex Alloy

“…The DFT calculations showed that the spin configuration of the FCNM CCA system at T = 0 K is collinear, indicating that the spin chirality is suppressed under this condition. [ 34 ] Therefore, it appears that a thermal perturbation is a necessary condition for the formation of THE. When the temperature surpasses a critical value, the long‐range magnetic order is eliminated by thermal fluctuations, and the sample becomes paramagnetic.…”

“…The disordered distribution of spins can be attributed to severe magnetic frustration, which is caused by chemical disorder within the fcc lattice. [ 34 ] When a moderate transverse field of B = 0.13 T was applied, the intensity of neutron scattering caused by the magnetic moments became weaker due to the alignment of spins along the direction of B (Figure 3d). However, the nuclear scattering remained unchanged despite the application of the field.…”

“…Earlier studies have revealed that the FCNM CCAs exhibit a reentrant spin glass behavior, with a glass transition temperature even above room temperature. [ 34 ] This observation implies a high degree of magnetic frustration in these alloys. The strong magnetic frustration arises from the direct short‐range exchange interactions among the magnetic atoms situated on the close‐packed lattice.…”

“…It can be found that the magnetic moment characteristics are retained even if the Fe, Co, and Ni atoms are no longer in equiatomic proportions. [ 34,53 ] Furthermore, a minor energy shift of less than 5 × 10 −4 meV/atom is observed upon switching the direction of the magnetic field, suggesting that the magnetocrystalline anisotropy is negligible. This result excludes magnetocrystalline anisotropy as the source of noncoplanar magnetism.…”

“…[31][32][33] However, the RKKY interaction is long-range and indirect and often yields a relatively weak or moderate magnetic frustration. [34] So far, CSTs in other material systems have not been reported yet. Research into the CSTs and their related exotic topological properties, based on novel physical mechanisms, has become one of the central directions in condensed matter physics.…”