Ordering and phase separation in alloys of the Fe–Co system

Ustinovshikov, Y.; Пушкарев, Б. Е.

doi:10.1016/j.jallcom.2005.12.091

Cited by 31 publications

(9 citation statements)

References 12 publications

(34 reference statements)

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“…For the Co rich alloy, the peak appears at a MgO thickness of 2.0 nm and disappears upon annealing. This different behaviour may be related to a bcc-fcc phase transition which occurs in Co rich alloys (70-75% of Co) [11,13].…”

Section: Resultsmentioning

confidence: 98%

Composition Dependence of Perpendicular Magnetic Anisotropy in Ta/Co_xFe_80-xB₂₀/MgO/Ta (x=0, 10, 60) Multilayers

Lam¹,

Bonell²,

Miwa³

et al. 2013

Journal of Magnetics

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The perpendicular magnetic anisotropy of sputtered CoFeB thin films covered by MgO was investigated by vibrating sample magnetometry. Three different Co x Fe 80-x B 20 alloys were studied. Under out-of plane magnetic field, the saturation field was found to increase with increasing the Co content. The magnetization and interface anisotropy energy were obtained for all samples. Both showed a marked dependence on the MgO overlayer thickness. In addition, their variations were found to be non-monotonous as a function of the Co concentration.

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Section: Resultsmentioning

confidence: 98%

Composition Dependence of Perpendicular Magnetic Anisotropy in Ta/Co_xFe_80-xB₂₀/MgO/Ta (x=0, 10, 60) Multilayers

Lam¹,

Bonell²,

Miwa³

et al. 2013

Journal of Magnetics

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“…To test the reasonableness of these results, the element concentration in the bulk alnico alloy was calculated from the site concentrations determined by this study and found to be consistent with measured alloy composition (see supplementary Table S1 ). Furthermore, the B2 ordering of the dominantly Fe-Co phase and the site occupancies of the L2 1 phase have each been reported separately in bulk samples near these respective compositions 18 19 . In summary, we demonstrate a chemical mapping technique capable of determining atomic-scale chemical structure of individual phases within a complex nanostructured alloy.…”

Section: Resultsmentioning

confidence: 99%

Atomic-scale Chemical Imaging and Quantification of Metallic Alloy Structures by Energy-Dispersive X-ray Spectroscopy

Zhou

Kramer

et al. 2014

Sci Rep

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Determination of atomic-scale crystal structure for nanostructured intermetallic alloys, such as magnetic alloys containing Al, Ni, Co (alnico) and Fe, is crucial for understanding physical properties such as magnetism, but technically challenging due to the small interatomic distances and the similar atomic numbers. By applying energy-dispersive X-ray spectroscopy (EDS) mapping to the study of two intermetallic phases of an alnico alloy resulting from spinodal decomposition, we have determined atomic-scale chemical composition at individual lattice sites for the two phases: one is the B2 phase with Fe0.76Co0.24 -Fe0.40Co0.60 ordering and the other is the L21 phase with Ni0.48Co0.52 at A-sites, Al at BΙ-sites and Fe0.20Ti0.80 at BΙΙ-sites, respectively. The technique developed through this study represents a powerful real-space approach to investigate structure chemically at the atomic scale for a wide range of materials systems.

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“…The bulk Co-Fe phase diagrams 25,26 shows that the α Fe bcc phase exists at higher temperatures for all compositions. At temper atures lower than 912 °C and Co concentrations > 50 at.%, the bcc phase intersects with a mixed phase region of face centred cubic (fcc) Co and bcc Fe phases.…”

mentioning

confidence: 93%

Giant magnetostriction in annealed Co1−xFex thin-films

et al. 2011

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Chemical and structural heterogeneity and the resulting interaction of coexisting phases can lead to extraordinary behaviours in oxides, as observed in piezoelectric materials at morphotropic phase boundaries and relaxor ferroelectrics. However, such phenomena are rare in metallic alloys. Here we show that, by tuning the presence of structural heterogeneity in textured Co 1 − x Fe x thin films, effective magnetostriction λ eff as large as 260 p.p.m. can be achieved at lowsaturation field of ~10 mT. Assuming λ 100 is the dominant component, this number translates to an upper limit of magnetostriction of λ 100 ≈ 5λ eff > 1,000 p.p.m. microstructural analyses of Co 1 − x Fe x films indicate that maximal magnetostriction occurs at compositions near the (fcc + bcc)/bcc phase boundary and originates from precipitation of an equilibrium Co-rich fcc phase embedded in a Fe-rich bcc matrix. The results indicate that the recently proposed heterogeneous magnetostriction mechanism can be used to guide exploration of compounds with unusual magnetoelastic properties.

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Ordering and phase separation in alloys of the Fe–Co system

Cited by 31 publications

References 12 publications

Composition Dependence of Perpendicular Magnetic Anisotropy in Ta/Co_xFe_80-xB₂₀/MgO/Ta (x=0, 10, 60) Multilayers

Composition Dependence of Perpendicular Magnetic Anisotropy in Ta/Co_xFe_80-xB₂₀/MgO/Ta (x=0, 10, 60) Multilayers

Atomic-scale Chemical Imaging and Quantification of Metallic Alloy Structures by Energy-Dispersive X-ray Spectroscopy

Giant magnetostriction in annealed Co1−xFex thin-films

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Ordering and phase separation in alloys of the Fe–Co system

Cited by 31 publications

References 12 publications

Composition Dependence of Perpendicular Magnetic Anisotropy in Ta/CoxFe80-xB20/MgO/Ta (x=0, 10, 60) Multilayers

Composition Dependence of Perpendicular Magnetic Anisotropy in Ta/CoxFe80-xB20/MgO/Ta (x=0, 10, 60) Multilayers

Atomic-scale Chemical Imaging and Quantification of Metallic Alloy Structures by Energy-Dispersive X-ray Spectroscopy

Giant magnetostriction in annealed Co1−xFex thin-films

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Product

Resources

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Composition Dependence of Perpendicular Magnetic Anisotropy in Ta/Co_xFe_80-xB₂₀/MgO/Ta (x=0, 10, 60) Multilayers

Composition Dependence of Perpendicular Magnetic Anisotropy in Ta/Co_xFe_80-xB₂₀/MgO/Ta (x=0, 10, 60) Multilayers