Spin wave Brillouin measurements in FeCo with a virtually imaged phased array spectrometer
Bibliographic record
Abstract
We demonstrate for what we believe to be the first time the efficient acquisition of spin wave Brillouin spectra with a virtually imaged phase array-based spectrometer and an etalon-based notch filter. Thermally excited magnons in a 5 nm epitaxially grown single-crystalline Fe 75 Co 25 film are detectable within 100 ms and a signal-to-noise ratio greater than 100 is achieved in 10 seconds with a spectral resolution of 0.45 GHz and a pump power of 23 mW. The dependence of the Brillouin shift on the externally applied magnetic field is characterized for fields ranging from 29 to 370 mT, and the effective magnetization is estimated to be 1.6 ± 0.1 MA/m. A 2D map of the spatial variation of the Brillouin shift obtained in a non-uniform magnetic field demonstrates the suitability of virtually imaged phase array-based instrumentation for imaging spin wave propagation in magnonic devices.
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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) | 0.000 | 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".