FePt
Iron platinum · FePt alloy
FePt is a stable metallic alloy composed of iron and platinum that is highly valued for its structural reliability in magnetic and catalytic technologies.
About Iron platinum
FePt is a robust metallic alloy belonging to the platinum-group catalyst family. As a thermodynamically stable phase located on the convex hull, it exhibits exceptional structural integrity, which is supported by its extensive representation across multiple materials databases. Its metallic nature and stable lattice configuration make it a subject of significant interest for advanced materials research. This compound is primarily utilized in high-density magnetic storage media and as a specialized catalyst in chemical synthesis. Its ability to maintain a stable structure under various conditions allows it to serve as a reliable component in demanding technological applications where material longevity and consistent electronic performance are required.
Key Properties
Cross-validated computational properties for Iron platinum, aggregated across 5 databases.
Band GapEnergy needed to move an electron from the valence band to the conduction band. Lower or zero values tend to behave more metallic; larger gaps are more insulating or semiconducting.
Energy Above HullThermodynamic distance from the most stable set of competing phases. 0 eV/atom is on the convex hull; small positive values may still be experimentally accessible.
StabilityA plain-language summary of the best reported energy-above-hull result. It reflects whether the lowest-energy structure is on, near, or far from the stability hull.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of FePt. Tight agreement means computed properties can be trusted without re-running calculations.
Agreement ScoreA normalized confidence score summarizing how closely independent DFT databases agree. Higher scores mean tighter cross-source agreement.
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
Reported Structures
Lowest-energy structures reported for FePt, ranked by energy above hull.
| Space GroupSymmetry classification of the crystal arrangement. The number is the international space-group index. | Crystal SystemBroad lattice family, such as cubic, tetragonal, monoclinic, or triclinic, derived from unit-cell symmetry. | Band Gap (eV)Electronic gap calculated for this specific reported structure, measured in electronvolts. | E above hull (eV/atom)Thermodynamic distance from the convex hull for this structure, normalized per atom. Lower is generally more stable. | E/atom (eV)Computed total energy normalized per atom. Use energy above hull, not this value alone, when comparing stability. | Density (g/cm³)Mass per relaxed crystal volume, reported in grams per cubic centimeter. |
|---|---|---|---|---|---|
| — | — | 0.00 | 0.0000 | -0.241 | — |
| P4/mmm (No. 123) | tetragonal | 0.00 | 0.0000 | -0.198 | — |
| P4/mmm (No. 123) | tetragonal | 0.00 | 0.0000 | -7.503 | 14.98 |
| P4/mmm (No. 123) | tetragonal | 0.00 | 0.0000 | -0.198 | — |
| — | — | 0.00 | 0.0362 | -0.204 | — |
| — | — | 0.00 | 0.1146 | -0.126 | — |
| — | — | 0.00 | 0.1239 | -0.117 | — |
| — | — | 0.00 | 0.1321 | -0.108 | — |
| — | — | 0.00 | 0.1662 | -0.074 | — |
| — | — | 0.00 | 0.4479 | 0.207 | — |
| — | — | 0.00 | 0.5594 | 0.319 | — |
| — | — | 0.00 | 0.8625 | 0.622 | — |
Applications
Where Iron platinum is used.
Patent Landscape
12 patents reference FePt or close compositional variants.
| Patent | Title | Assignee | Granted |
|---|---|---|---|
| 6183606 | Manufacture method of high coercivity FePt-Si3N4 granular composite thin films | — | — |
| 9358612 | FePt-based sputtering target | — | — |
| 10787732 | FePt-C-based sputtering target | — | — |
| 8858674 | FePt—C-based sputtering target and process for producing the same | — | — |
| 10186404 | FePt—C-based sputtering target and method for manufacturing same | — | — |
| 9899050 | Multiple layer FePt structure | — | — |
| 9095901 | FePt-based sputtering target | — | — |
| 8679654 | Magnetic recording medium including plural FePt alloy layers including carbon, oxides or nitrides | — | — |
| 9520151 | Multiple layer FePt structure | — | — |
| 9314845 | Process for producing FePt-based sputtering target | — | — |
Frequently Asked Questions
Common questions about Iron platinum, answered from cross-validated data.
What is FePt?
FePt is a stable metallic alloy composed of iron and platinum that is highly valued for its structural reliability in magnetic and catalytic technologies.
What is FePt used for?
What is the band gap of FePt?
Is FePt a metal, semiconductor, or insulator?
Is FePt thermodynamically stable?
What is the crystal structure of FePt?
How many polymorphs of FePt are known?
What elements does FePt contain?
Where does the data for FePt come from?
How It Compares
Within the platinum-group alloy catalysts class.
Within the diverse group of platinum-group alloys, FePt stands out for its high structural stability compared to more complex or less common intermetallics like BaPd or Ga2Ru. While many members of this class, such as As2Pt or IrSe2, are explored for their unique electronic properties, FePt is distinguished by its well-documented phase behavior and its prominent role in magnetic materials science.
Related Compounds
Other Platinum-Group Alloy Catalysts in the database.
Data sources & attribution
- oqmd — Data from the OQMD (oqmd.org). Cite: Saal et al., JOM 65, 1501 (2013); Kirklin et al., npj Comp. Mater. 1, 15010 (2015). (CC-BY-4.0)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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