Magnetic properties of amorphous<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>90</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Mn</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Zr</mml:mi></mml:mrow><mml:mrow><mml:mn>10</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>(</mml:mo><mml:mn>0</mml:mn><mml:mn/><mml:mo><~</mml:mo><mml:mi>x</mml:mi><mml:mo><~</mml:mo><mml:mn>1</mml:mn><mml:mn>2</mml:mn><mml:mo>)</mml:mo></mml:math>alloys
Bibliographic record
Abstract
The magnetization as a function of field and temperature has been measured for a series of amorphous ${\mathrm{Fe}}_{90\ensuremath{-}x}{\mathrm{Mn}}_{x}{\mathrm{Zr}}_{10}$ alloys with $x=0--12$ in the temperature range 4.2--300 K. All the samples of the present study show double transition (reentrant) behavior below room temperature. The high-temperature transition ${(T}_{c})$ decreases linearly at about 6 K/at. % of Mn, while the low-temperature transition ${(T}_{\mathrm{sg}})$ increases at about 2.6 K/at. % of Mn. A detailed analysis of the temperature dependence of magnetization data reveals: (i) Spin-wave excitations at low-temperature, single-particle excitations and local-spin-density fluctuations (LSDF's) over a wide range of intermediate temperatures and enhanced fluctuations in the local magnetization for temperature close to ${T}_{c}$ contribute dominantly to the thermal demagnetization of spontaneous magnetizations; (ii) external applied magnetic field of strength $>~5\mathrm{kOe}$ suppresses the LSDF's; (iii) the spin-wave stiffness constant (D) decreases from $35.6\ifmmode\pm\else\textpm\fi{}0.3$ to $23.2\ifmmode\pm\else\textpm\fi{}0.2\mathrm{meV}{\AA{}}^{2}$ with increasing Mn concentration; and (iv) the ${D/T}_{c}$ ratio remains constant for all the compositions. A study of critical behavior of the magnetic order-disorder transition by various methods suggest that the critical exponents obtained below and above Curie temperature obey a scaling law $[\ensuremath{\delta}\ensuremath{-}1=\ensuremath{\gamma}/\ensuremath{\beta}$ and $\ensuremath{\alpha}+\ensuremath{\gamma}=2(1\ensuremath{-}\ensuremath{\beta})]$ with a high degree of accuracy in the asymptotic critical region. The exponents are independent of composition and are in close agreement with the values those predicted for three-dimensional Heisenberg ferromagnets. The magnetic parameters such as high-field susceptibility, coercivity, local magnetic anisotropy, and spin-glass behavior, obtained from the low-temperature magnetization data, are consistent with the presence of a mixed magnetic state. The detailed analysis of high-field thermomagnetization data could be explained in terms of the nearest-neighbor Heisenberg model. Moreover, the temperature dependence of the magnetic behavior is discussed in terms of competing ferromagnetic and antiferromagnetic exchange interactions.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.022 | 0.003 |
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".