Atomic disorder and glass-like magnetism found in NiRuMnGa alloy
An experimental and theoretical study found Ni/Ru and Mn/Ga site mixing in the quaternary Heusler alloy NiRuMnGa and magnetic irreversibility near 48 K. The authors report ac susceptibility, magnetic relaxation and memory measurements as evidence supporting a cluster-glass state.
Source review period: 2026-10-09
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The team synthesized the alloy by arc melting under argon and combined powder X-ray diffraction and Rietveld refinement with first-principles calculations. The diffraction pattern was consistent with B2-type disorder on the Ni/Ru and Mn/Ga sublattices. Laboratory X-ray data could not reliably quantify the individual site occupancies.
Zero-field-cooled and field-cooled dc susceptibility began to separate near 48 K, and the irreversibility temperature fell as the applied field increased. Ac susceptibility, relaxation and memory measurements supported slow spin dynamics, while no clear heat-capacity anomaly appeared. The authors interpret this as a cluster-glass state; the study does not demonstrate device or application performance.
Data
Measurements reported by the study
The table reports only findings within this study’s experimental or model scope.
| Additional experimental probes of slow spin dynamics | 3 | Ac susceptibility, magnetic relaxation and memory-effect measurements were used to support the cluster-glass interpretation; laboratory X-ray diffraction did not resolve site occupancies quantitatively. |
Methodology
Quantity and scope are taken from the methods and results of the first arXiv version dated 9 October 2026; they should not be generalized beyond the study.
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