On Magnon Superfluidity in Ferromagnetic Films
Bibliographic record
Abstract
More than ten years ago, Bose-Einstein condensation (BEC) of magnons (or quantized spin\nwaves) was experimentally observed in yttrium iron garnet (YIG) films at room temperature.\nSince BEC and superfluidity are closely related phenomena, it is natural to ask whether such\nmagnon condensates can transport as superfluid and, if so, how such superfluid looks like. In\nthis work, we study theoretically superfluidity of magnons in ferromagnetic films. We first give\nan review of the basic theory of magnons in ferromagnetic films. We then discuss BEC of\nmagnons from both experimental and theoretical points of view. Then we study superfluidity of\nmagnons in ferromagnetic films by starting from a model of spins in ferromagnetic films. Model\nin terms of magnon operators is then introduced, and a Hamiltonian describing the condensed\nmagnons is derived. Focusing on the one-dimensional (1D) stationary case, we study behaviors\nof superfluid formed by the condensed magnons. We found an unconventional soliton-like profile\nof the magnon superfluid, as compared to a uniform superflow, which we argued to be due to the\ndipolar interaction. We also show by estimates that in YIG films it is possible to have a superfluid\ncurrent that strongly exceeds the current of normal magnons, so the magnon superfluidity could\npossibly be observed.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| 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 source (direct Gemma or distilled Codex), 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".