Exchange interaction in L1-ordered FePt and CoPt from first-principles
Bibliographic record
Abstract
The exchange interactions have been studied from a first-principles density functional calculation in FePt and CoPt with the tetragonal L10-type structure. For FePt, the effective exchange parameters of Fe at the sites 1a and 1c, JFe1a and JFe1c, have the same negative value (−1.40 mRy) while that between Fe (1a) and Fe (1c), JFe1a-1c, have a large positive value (8.29 mRy) and JFe-Pt also has a positive value (1.20 mRy). Similarly, for CoPt, the exchange parameters are JCo1a = JCo1c = −0.86 mRy, JCo1a-1c = 8.47 mRy and JCo-Pt = 1.30 mRy. The estimated mean fields TC are about 802 K and 870 K for FePt and CoPt, respectively, in good agreement with the experiments. TC shows peak value at c/a = 1 in FePt and CoPt, respectively, resulting from the interplay between negative and positive exchange interactions.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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) | 0.001 | 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".