Experimental evidence for the formation of CoFe2C phase with colossal magnetocrystalline-anisotropy

El-Gendy, Ahmed A.; Bertino, Massimo F.; Clifford, Dustin M.; Qian, Meichun; Khanna, Shiv N.; Carpenter, Everett E.

doi:10.1063/1.4921789

Cited by 36 publications

(23 citation statements)

References 18 publications

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“…Co 2 C is orthorhombic, and has been produced in the form of coercive nanoparticles, with a relatively small magnetization [44]. The magnetization of CoFe 2 C nanoparticles is slightly higher, but they exhibits even less coercivity, despite a questionable claim of exceptional magnetocrystalline anisotropy in this compound [45].…”

Section: New Materialsmentioning

confidence: 99%

Magnetic anisotropy — How much is enough for a permanent magnet?

2016

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Material choices for permanent magnets are analyzed in terms of energy product, anisotropy and hardness parameter. Energy product is the main consideration for permanent magnets, because the purpose of a magnet is to store magnetostatic energy and create as much flux as possible in the surrounding space. Magnet processing is easiest if the hardness parameter is significantly greater than one. The anisotropy requirement becomes increasingly stringent for large M s and K 1 values of 1 to 2 MJ/m 3 may be insufficient. Some potential new magnets and alternative strategies to develop magnetic hardness are discussed.

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Section: New Materialsmentioning

confidence: 99%

Magnetic anisotropy — How much is enough for a permanent magnet?

2016

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“…In this study, using density-functional theory (DFT) calculations, we consider carbon (C) as an alternative dopant to B in fabricating a CoFe/MgO MTJ, due to the comparable atomic radii of B and C atoms. CoFeC alloys can exhibit colossal magnetocrystalline anisotropy [26] and retain a good epitaxy with the MgO layer [27]. However, the behavior of the C dopant in the annealing process of CoFe/MgO/CoFe MTJ fabrication and its impact on device TMR are less known.…”

Section: Introductionmentioning

confidence: 99%

Effects of B and C doping on tunneling magnetoresistance in CoFe/MgO magnetic tunnel junctions

et al. 2018

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Using density-functional theory calculations, we investigate the dominant defects formed by boron (B) and carbon (C) impurities in a CoFe/MgO/CoFe magnetic tunnel junction (MTJ) and their influence on conductivity and tunneling magnetoresistance (TMR). We find that, in the O-poor conditions relevant to experiment, B forms the substitutional defect B Co and C forms the interstitial site C i at the CoFe/MgO interface. The C-doped MTJ is predicted to have a significantly higher TMR than the B-doped MTJ. This is due to interface state densities associated with the majority spin 1 -symmetry bands being more heavily suppressed by the B Co defects than by the C i defects. Our results indicate that carbon can serve as a viable alternative to boron as a dopant for MTJ fabrication.

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“…Recently, several Fe-based RE-free compounds such as Fe-Co-X (X being B, C or N) [2][3][4][5][6][7], Fe(Co)Pt [8], and Fe 2 P [9] have been studied intensively as potential permanent magnet materials. These studies have demonstrated that the MAE of Fe can be improved substantially by allowing with other non-magnetic elements.…”

Section: Introductionmentioning

confidence: 99%

Structures and magnetic properties of iron silicide from adaptive genetic algorithm and first-principles calculations

Yang

Zhao

et al. 2018

Journal of Applied Physics

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We performed a systematic search for low-energy structures of binary iron silicide over a wide range of compositions using the crystal structure prediction method based on adaptive genetic algorithm. 36 structures with formation energies within 50 meV/atom (11 of them are within 20 meV) above the convex hull formed by experimentally known stable structures are predicted. Magnetic properties of these low-energy structures are investigated. Some of these structures can be promising candidates for rare-earth-free permanent magnet.

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Experimental evidence for the formation of CoFe2C phase with colossal magnetocrystalline-anisotropy

Cited by 36 publications

References 18 publications

Magnetic anisotropy — How much is enough for a permanent magnet?

Magnetic anisotropy — How much is enough for a permanent magnet?

Effects of B and C doping on tunneling magnetoresistance in CoFe/MgO magnetic tunnel junctions

Structures and magnetic properties of iron silicide from adaptive genetic algorithm and first-principles calculations

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