Site preference and magnetic properties for a perpendicular recording material: BaFe_{12-x}Zn_{x/2}Zr_{x/2}O_{19} nanoparticles
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Bibliographic record
Abstract
The site preference and magnetic properties of Zn-Zr substituted BaM ferrite ${\mathrm{BaFe}}_{12\ensuremath{-}x}{\mathrm{Zn}}_{x/2}{\mathrm{Zr}}_{x/2}{\mathrm{O}}_{19}$ nanoparticles with $x=0--1.6$ have been studied using M\"ossbauer spectra and magnetic measurement. The results show that the magnetizations and magnetocrystalline anisotropies are closely related to the distributions of Zn-Zr ions on the five sites. The ${\mathrm{BaFe}}_{12\ensuremath{-}x}{\mathrm{Zn}}_{x/2}{\mathrm{Zr}}_{x/2}{\mathrm{O}}_{19}$ nanoparticles exhibit unusual saturation magnetization, which increase at low substitutions, reach a maximum and then decrease. M\"ossbauer spectra show that the Zn-Zr ions preferentially occupy the $2b$ and ${4f}_{\mathrm{VI}}$ sites. The preference for the ${4f}_{\mathrm{VI}}$ site is responsible for the anomalous increase in the magnetization at low Zn-Zr substitutions. At $x>~1.2$ the rapid decrease in the magnetizations is mainly attributed to a noncollinear magnetic structure. In addition, a monotonic decrease in the magnetocrystalline anisotropy with Zn-Zr substitutions has its origin in the preference of the Zn-Zr ions for the $2b$ and ${4f}_{\mathrm{VI}}$ sites.
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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) | 0.001 | 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) | 0.020 | 0.001 |
Machine scores (provisional)
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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 it