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
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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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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 | 0.009 | 0.007 |
| Meta-epidemiology (narrow) | 0.006 | 0.012 |
| Meta-epidemiology (broad) | 0.002 | 0.012 |
| Bibliometrics | 0.004 | 0.008 |
| Science and technology studies | 0.008 | 0.012 |
| Scholarly communication | 0.009 | 0.008 |
| Open science | 0.014 | 0.012 |
| Research integrity | 0.011 | 0.010 |
| Insufficient payload (model declined to judge) | 0.971 | 0.017 |
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 it