Magnetic relaxation in exchange-coupled Co/CoO bilayers measured with ac-anisotropic magnetoresistance
Bibliographic record
Abstract
The complex ac-susceptibility of field-cooled Co/CoO bilayers has been measured by perturbing the magnetization with a small (5 Oe) ac field, and detecting the response through anisotropic magnetoresistance using a double modulation technique. Samples of Ta(3 nm)/Co(8 nm)/CoO(3 or 10 nm)/Cu(3 nm) grown by sputter deposition on an amorphous silicon nitride substrate have been studied using a frequency of 100 Hz. The relaxation of the exchange anisotropy in response to the perturbation allows the activation energies and relaxation times of the CoO grains to be investigated. Both the real and imaginary response show prominent thickness-dependent peaks at the blocking temperature, as well as a peak near 80 K which is insensitive to CoO film thickness. The measurements are well-described by a generic linear relaxation model of the anisotropy field, using a bimodal distribution of activation energies for the CoO grains.
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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".