Magnetism and point defect in B2-type CoFe alloys

Kogachi, Mineo; Tadachi, N.; Kohata, H.; Ishibashi, Hiroki

doi:10.1016/j.intermet.2004.09.012

Cited by 19 publications

(31 citation statements)

References 16 publications

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“…44,45 Small concentrations of impurities of C and N in bcc Fe were shown to modify the hybridization of the Fe 3d orbitals, even though the anisotropy contribution of the C and N were small. [46][47][48] More important could be the strain effects from the interstitials themselves. Theoretical calculations have suggested that compounds containing mixtures of 3d transition elements and 4d and 5d elements can have large magnetocrystalline anisotropy via large spin-orbit coupling.…”

Section: Other Fe-based Compounds Without Rare Earth Elementsmentioning

confidence: 99%

Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators

Kramer

McCallum

Anderson

et al. 2012

JOM

274

148

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With the advent of high-flux density permanent magnets based on rare earth elements such as neodymium (Nd) in the 1980s, permanent magnet-based electric machines had a clear performance and cost advantage over induction machines when weight and size were factors such as in hybrid electric vehicles and wind turbines. However, the advantages of the permanent magnet-based electric machines may be overshadowed by supply constraints and high prices of their key constituents, rare earth elements, which have seen nearly a 10-fold increase in price in the last 5 years and the imposition of export limits by the major producing country, China, since 2010. We outline the challenges, prospects, and pitfalls for several potential alloys that could replace Nd-based permanent magnets with more abundant and less strategically important elements.

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Section: Other Fe-based Compounds Without Rare Earth Elementsmentioning

confidence: 99%

Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators

Kramer

McCallum

Anderson

et al. 2012

JOM

274

148

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show abstract

“…Through these studies, the point defect structure and its behavior due to composition and temperature were clarified [4][5][6][8][9][10] and also the correlation between the point defects and the mechanical behavior was discussed [7,11]. More recently, we have studied the point defect behavior and the ferromagnetism in B2 Co 1Kc Fe c (0.4%c%0.6) alloys [12][13][14]. The mean magnetic moment obtained as a function of quenching temperature showed a decrease with increase in quenching temperature in any composition.…”

Section: Introductionmentioning

confidence: 96%

“…This suggests a strong correlation between the magnetism and the point defect behavior in B2 Co 1Kc Fe c alloys, because the point defect structure varies depending on temperature. Since the defect structure can be expressed in terms of the long-range order (LRO) parameter, a relation between the mean magnetic moment and the LRO parameter was examined, under the assumption that the LRO state in the quenched alloy is the same as that appearing at that temperature [12,14]. As a result, the mean magnetic moment was found to change linearly with respect to the square of the LRO parameter.…”

Section: Introductionmentioning

confidence: 99%

Structural properties and magnetic behavior in CoFe1−xAlx alloys

Kogachi¹,

Tadachi²,

Nakanishi³

2006

Intermetallics

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“…As mentioned previously, an antisite atom can be formed in an off-stoichiometric composition. The long range order parameter (S) can be defined as [13]:…”

Section: Resultsmentioning

confidence: 99%

Structural and Magnetic Properties of Epitaxial Fe_xCo_100-xAlloys Grown on Cr Substrate

Hossain¹,

Kim²,

Chun³

et al. 2014

Journal of Magnetics

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We report the correlation between the magnetic properties and lattice parameter of Fe x Co 100-x alloys as a function of constituent concentration. The saturation magnetization increases with Fe content and has a maximum value at approximately x = 70 at.%. However, collapse in relative saturation magnetization is observed at approximately 30 at.% to 70 at.% of Fe in Fe x Co 100-x alloys. The collapse is due to the formation of Co-Co and Fe-Fe antibonding states instead of Fe-Co bonds. The lattice parameter also shrinks at approximately 30 at.% to 70 at.% of Fe. This shrinkage is due to an increase in the number of nearest neighbor antisite atoms, which then leads to a decrease in the long range order parameter.

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Magnetism and point defect in B2-type CoFe alloys

Cited by 19 publications

References 16 publications

Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators

Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators

Structural properties and magnetic behavior in CoFe1−xAlx alloys

Structural and Magnetic Properties of Epitaxial Fe_xCo_100-xAlloys Grown on Cr Substrate

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Magnetism and point defect in B2-type CoFe alloys

Cited by 19 publications

References 16 publications

Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators

Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators

Structural properties and magnetic behavior in CoFe1−xAlx alloys

Structural and Magnetic Properties of Epitaxial FexCo100-xAlloys Grown on Cr Substrate

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Structural and Magnetic Properties of Epitaxial Fe_xCo_100-xAlloys Grown on Cr Substrate