Large Anomalous Hall Effect in a Nanocrystalline Room-Temperature Ferromagnetic CoCrFeNiGa High-Entropy Alloy
Bibliographic record
Abstract
Magnetic high-entropy alloys (HEAs) with their unusual blend of long-range magnetic order and exceptional mechanical properties are beneficial for the development of next-generation spintronic devices that can withstand extreme conditions. Developing room-temperature magnetic HEAs and understanding the link among their magnetic, electronic, and mechanical properties are crucial. Here, we introduce nanocrystalline CoCrFeNiGa as a room-temperature bulk magnetic HEA candidate based on 3d-transition metals and elucidate its magnetic and electronic properties. Structural characterization reveals the existence of mixed BCC and FCC phases with a crystallite size of ∼51 nm. CoCrFeNiGa shows a high Curie temperature ( T C ) of ∼872 K and soft magnetic behavior with minimal coercivity. We also observed spin freezing below 60 K, likely due to competing magnetic interactions among its 3d-transition metals. Electrical resistivity measurements confirm metallic behavior with magnon contributions below 50 K. Interestingly, CoCrFeNiGa exhibits a large anomalous Hall effect (AHE), with an anomalous Hall conductivity of ∼603 S·cm –1 at 5 K and ∼144 S·cm –1 at 300 K, persisting despite inherent disorder. This AHE is primarily attributed to an intrinsic mechanism. The combination of the above room-temperature magnetic order, soft magnetic properties, a large intrinsic AHE, and competing magnetic interactions positions CoCrFeNiGa as a prospective candidate for the development of next-generation robust spintronic devices and architectures using nanocrystalline magnetic HEAs, which are resilient under demanding conditions.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".