Second harmonic of nonlinear magnetoimpedance in amorphous magnetic wires with helical anisotropy
Bibliographic record
Abstract
The axial magnetic field dependence of the second harmonic of giant magnetoimpedance in Co-rich amorphous wires with helical anisotropy has been measured to high field resolution in the current amplitude range of 2–14 mArms and frequency range of 200 kHz–3 MHz. We have found that the intensity of the inner peaks of the four-peak structure increases with current amplitude until a threshold value, and then begins to decrease without changing position, whereas the outer peaks decrease monotonically and move to higher field. When frequency is increased from 200 kHz to about 2 MHz, all of the four peaks increase in height and move to higher field. Beyond 2 MHz, all of the peaks move to lower field; the intensity of the inner peaks decreases while the outer peaks continue to increase. At low frequency and current, a third pair of peaks appears between the two inner peaks and disappears when the frequency increases. Using a simple quasistatic model, the four-peak and six-peak structures are explained qualitatively. The variation with the current amplitude is also understood. However, accurate determination of the second harmonic signal and its frequency dependence requires a more complete model.
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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 | 0.000 |
| 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 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".