Magnetoelasticity of bcc Fe–Ga Alloys

Petculescu, Gabriela; Wu, Ruqian; McQueeney, R. J.

doi:10.1016/b978-0-444-56371-2.00003-9

Cited by 35 publications

(15 citation statements)

References 107 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the aged sample has stronger magnetocrystalline anisotropy than the solution-treated one, as the saturation field and magnetostriction hysteresis are larger than those for the latter. According to earlier studies1422233031, bcc (A2, B2, and DO 3 )-structured Fe–Ga alloys have positive magnetostriction, but the fcc (L1 2 )-structured Fe–Ga alloys have negative magnetostriction. The positive magnetostriction is consistent with these studies.…”

Section: Resultsmentioning

confidence: 89%

“…The slight magnetization reduction in Fig. 1 at temperatures close to 880 K is due to the thermal-related ordering loss for the fcc phase, whose T C is predicted as high as α -Fe, ∼1,042 K (refs 2, 14). However, the ferromagnetic fcc→paramagnetic hcp transformation disrupts completely magnetic ordering before its T C .…”

Section: Resultsmentioning

confidence: 90%

“…Since the discovery in 2000, mechanically strong and malleable Fe 100− x Ga x alloys (known as Galfenol) have attracted intensive attention due to the combination of large magnetostriction, low switching field and high T C , which are promising for applications in sensors, actuators and transducers1213141516171819202122232425262728. Previous investigations182021222324 have shown that both magnetization and structure of the Fe 100− x Ga x alloys are very sensitive to heat treatments.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Highly thermal-stable ferromagnetism by a natural composite

Ma¹,

Gou²,

Hu³

et al. 2017

Nat Commun

View full text Add to dashboard Cite

All ferromagnetic materials show deterioration of magnetism-related properties such as magnetization and magnetostriction with increasing temperature, as the result of gradual loss of magnetic order with approaching Curie temperature TC. However, technologically, it is highly desired to find a magnetic material that can resist such magnetism deterioration and maintain stable magnetism up to its TC, but this seems against the conventional wisdom about ferromagnetism. Here we show that a Fe–Ga alloy exhibits highly thermal-stable magnetization up to the vicinity of its TC, 880 K. Also, the magnetostriction shows nearly no deterioration over a very wide temperature range. Such unusual behaviour stems from dual-magnetic-phase nature of this alloy, in which a gradual structural-magnetic transformation occurs between two magnetic phases so that the magnetism deterioration is compensated by the growth of the ferromagnetic phase with larger magnetization. Our finding may help to develop highly thermal-stable ferromagnetic and magnetostrictive materials.

show abstract

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 90%

mentioning

confidence: 99%

See 1 more Smart Citation

Highly thermal-stable ferromagnetism by a natural composite

Ma¹,

Gou²,

Hu³

et al. 2017

Nat Commun

View full text Add to dashboard Cite

show abstract

“…This asymmetry cannot be interpreted as an unresolved tetragonal splitting since the neutron data would imply that c/a > 1, whereas, the x-ray data (with tail to the high-Q side) would imply c/a < 1. Rather, the peak asymmetry is consistent with size-effect scattering 15 where the asymmetry arises from displacements of atoms from their nominal positions in the alloy due mainly to differences in ionic radii of Fe and Ga. The size-effect scattering is proportional to f Ga − f Fe , the difference in the scattering amplitude of Ga and Fe.…”

supporting

confidence: 60%

X-ray diffuse scattering measurements of chemical short-range order and lattice strains in a highly magnetostrictive Fe0.813Ga0.187alloy in an applied magnetic field

Huang

Lograsso

et al. 2012

Phys. Rev. B

View full text Add to dashboard Cite

“…A major goal of the interdisciplinary research of Galfenol is to further enhance their magnetostrictive coefficients for robust performance in devices678. The abrupt drop of magnetostriction of Galfenol, at x = 17 for slow-cooled (10°C/min) samples or x = 19 for quenched samples, was typically attributed to the development of short- and medium-range orderings of Ga atoms at high Ga concentration in the bcc Fe lattice151617.…”

mentioning

confidence: 99%

Understanding strong magnetostriction in Fe100−xGax alloys

Wang

Zhang

et al. 2013

Sci Rep

View full text Add to dashboard Cite

Magnetostriction of ferromagnetic materials describes the change of their shape or dimension in response to the reorientation of magnetization under the influence of external magnetic field. Fe100−xGax binary alloys (Galfenol) have large magnetostriction and excellent ductility; and they are very promising rare-earth free materials for applications in sensors, actuators, energy-harvesters and spintronic devices. Here we report results of large-scale ab initio molecular dynamics (AIMD) simulations for Galfenol, especially regarding the mechanism that leads to the sudden drop of tetragonal magnetostriction at x ~ 19, a long-standing puzzle for the community. Based on rigid band analysis, we propose possible ways to further optimize the performance of Galfenol for device applications. For example, we found that the substitution of a small amount of Cu for Ga (1.6%) in certain configuration may double the magnetostriction of Galfenol.

show abstract

Magnetoelasticity of bcc Fe–Ga Alloys

Cited by 35 publications

References 107 publications

Highly thermal-stable ferromagnetism by a natural composite

Highly thermal-stable ferromagnetism by a natural composite

X-ray diffuse scattering measurements of chemical short-range order and lattice strains in a highly magnetostrictive Fe0.813Ga0.187alloy in an applied magnetic field

Understanding strong magnetostriction in Fe100−xGax alloys

Contact Info

Product

Resources

About