Role of Disordered Precursor in L10 Phase Formation in FePt-Based Nanocomposite Magnet
Abstract
:1. Introduction
2. Experimental
3. Results and Discussion
3.1. As-Cast State
3.2. Isothermal Annealing
3.2.1. XRD Analysis
3.2.2. Mössbauer Analysis
3.2.3. Magnetic Properties
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Sample | Anneal. | L10 FePt | A1 FePt | Grain Size L10 FePt (nm) | Grain Size A FePt (nm) | ||
---|---|---|---|---|---|---|---|
a (Å) | c (Å) | c/a | a (Å) | ||||
Fe65Pt15Zr3B17 | As-cast | - | - | - | 3.8411 ± 0.02416 | - | 3.8 ± 1.4 |
500 °C | 3.8542 ± 0.0043 | 3.7127 ± 0.0067 | 0.9632 | 3.8315 ± 0.0308 | 15 ± 2 | 17 ± 3 | |
600 °C | 3.8537 ± 0.0027 | 3.7134 ± 0.0042 | 0.9636 | 3.8268 ± 0.0284 | 30 ± 3 | 36 ± 4 | |
700 °C | 3.8524 ± 0.0049 | 3.7147 ± 0.0071 | 0.9642 | 3.8379 ± 0.0247 | 46 ± 5 | 49 ± 5 | |
800 °C | 3.8516 ± 0.0052 | 3.7166 ± 0.0051 | 0.9649 | 3.8292 ± 0.0303 | 57 ± 3 | 54 ± 3 |
Annealing T | Profile R-Factor Rp | Weighted Profile Rwp | Goodness-of-Fit χ2 |
---|---|---|---|
500 °C | 4.89 | 2.11 | 1.37 |
600 °C | 4.31 | 2.24 | 1.23 |
700 °C | 3.78 | 2.19 | 1.31 |
800 °C | 3.54 | 2.05 | 1.29 |
Samples | IS (mm/s) | Γ/2 (mm/s) | QS (mm/s) | Bhf (T) | % | Phase |
---|---|---|---|---|---|---|
500 °C | 0.21 | 0.18 | −0.1 | 30.5 | 8 | A1(FePt) |
0.30 | 0.18 | 0.1 | 29.2 | 10 | A1(FePt) | |
0.27 | 0.18 | 0.27 | 27.6 | 28 | L10(FePt) | |
0.23 | 0.18 | 0.1 | 25.8 | 7 | Fe3B | |
0.12 | 0.18 | 0 | 22.1 | 7 | Fe2B | |
0.26 | 0.18 | 0.03 | 9.9 | 40 | Disordered Fe-Zr-B | |
600 °C | 0.20 | 0.18 | 0 | 28 | 13 | A1(FePt) |
0.28 | 0.18 | 0.33 | 27.6 | 43 | L10(FePt) | |
0.12 | 0.18 | 0 | 22.8 | 5 | Fe2B | |
0.28 | 0.18 | 0.06 | 9.5 | 39 | Disordered Fe-Zr-B | |
700 °C | 0.17 | 0.18 | 0.06 | 28.1 | 12 | A1(FePt) |
0.28 | 0.18 | 0.33 | 27.5 | 44 | L10(FePt) | |
0.11 | 0.18 | 0 | 22 | 6 | Fe2B | |
0.29 | 0.18 | 0.1 | 9.5 | 38 | Disordered Fe-Zr-B |
Annealing Conditions | Hc (kA/m) | μ0MS (T) | μ0Mr (T) | Mr/Ms | (BH)max (kJ/m3) |
---|---|---|---|---|---|
As-cast | 2.94 | 1.26 | 1.2 | 0.95 | - |
500 °C | 194 | 1.1 | 0.85 | 0.77 | 61 |
600 °C | 847 | 0.9 | 0.63 | 0.70 | 64 |
700 °C | 877 | 0.9 | 0.63 | 0.70 | 64 |
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Crisan, A.D.; Dan, I.; Crisan, O. Role of Disordered Precursor in L10 Phase Formation in FePt-Based Nanocomposite Magnet. Magnetochemistry 2021, 7, 149. https://doi.org/10.3390/magnetochemistry7110149
Crisan AD, Dan I, Crisan O. Role of Disordered Precursor in L10 Phase Formation in FePt-Based Nanocomposite Magnet. Magnetochemistry. 2021; 7(11):149. https://doi.org/10.3390/magnetochemistry7110149
Chicago/Turabian StyleCrisan, Alina Daniela, Ioan Dan, and Ovidiu Crisan. 2021. "Role of Disordered Precursor in L10 Phase Formation in FePt-Based Nanocomposite Magnet" Magnetochemistry 7, no. 11: 149. https://doi.org/10.3390/magnetochemistry7110149