Mössbauer Study of Hyperfine Magnetic Interactions in Fe-Ga Solid Solutions

Newkirk, L. R.; Tsuei, C. C.

doi:10.1103/physrevb.4.4046

Cited by 29 publications

(26 citation statements)

References 15 publications

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“…These results of the fits to the Mössbauer spectra from ribbons with 15 ≤ x ≤ 19.5 are shown in figure 7, where the agreement of this work with the results of Newkirk and Tsuei [16] and Dunlap et al [19] can be observed.…”

supporting

confidence: 82%

“…However, the site with a hyperfine field of 25.08T is expected to be a Fe site similar to A-sites of D0 3 but with only three Ga and five Fe nearest neighbours, rather than L1 2 site as suggested previously [19]. It is reported that the Fe 3 Ga L1 2 phase has one hyperfine field at 26.9 T with two quadrupole shifts [16]. In the present work, there is no need to introduce quadrupole shifts to obtain a better fit suggesting no observable L1 2 absorptions in the samples.…”

Section: Discussionmentioning

confidence: 63%

“…The site with a hyperfine field of 32.45 T has an isomer shift value identical to that of D0 3 D-sites, suggesting this site is similar to D-sites but with fewer Ga atoms as its next nearest neighbours. As the absorption area is much higher than the site with two Ga nearest neighbours, it is very likely the absorption with a hyperfine field of 32.45 T has a contribution from the site having one Ga nearest neighbour, as the sites with 0 or 1 Ga nearest neighbours in disordered bcc phase are believed to have similar hyperfine fields [16] normalized to the (220) peak, increases from 2.14% and 0.82% to 2.40% and 1.07% respectively after annealing, with an uncertainty of ±0.05%. The increases in both the peak intensities of neutron diffraction and the relative areas of Mössbauer spectrum indicate an increase in the volume of D0 3 phase after annealing, which in turn confirms that there may be an A2 phase in the as-quenched ribbons and a transformation from an A2 phase into D0 3 phase after annealing.…”

Section: Discussionmentioning

confidence: 99%

“…Mössbauer spectroscopy, in contrast, is sensitive to short-range order, and is capable of distinguishing between ordered and disordered atomic structures. There is much experimental literature dating from the early 1970s reporting the use of 57 Fe Mössbauer spectroscopy for the investigation of Fe-Ga alloys [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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A Mössbauer spectroscopy and neutron diffraction study of magnetostrictive, melt-spun Fe–Ga alloy ribbons

Mellors

Zhao

Simmons

et al. 2012

Journal of Magnetism and Magnetic Materials

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Ribbons of Fe 100−x Ga x (x = 15, 17.5, 19.5 and 22.5) were prepared by rapid solidification from the melt. 57Fe Mössbauer spectroscopy and high resolution neutron diffraction have revealed that Fe 100-x Ga x alloys with x = 15 and 17.5 have the disordered bcc (A2) structure even after annealing, but the alloy with x = 19.5 developed the short-range ordered D0 3 phase when annealed. The x = 22.5 alloys showed mainly D0 3 phase with a fraction of bcc phase. A fraction of the bcc phase transformed into D0 3 phase and the long-range ordering of D0 3 phase was improved after annealing. 57Fe Mössbauer spectra showed no observable L1 2 phase in any samples even though less than 1% volume of L1 2 phases have been found in the annealed samples by neutron diffraction. The additional absorption at hyperfine field of 25 T in x = 22.5 samples was regarded as a result of imperfect D0 3 structure, rather than a L1 2 phase.Keywords: Melt spun FeGa alloys; Magnetostrictive alloys; Mössbauer spectroscopy; neutron diffraction; Short-range order; Ferromagnetism Highlights:Melt-spun Fe 100-x Ga x alloys with (15 ≤ x ≤ 17.5) have a disordered bcc structure.Ribbons with x = 19.5 develop short-range ordered D0 3 phase upon annealing.The x = 22.5 ribbons show mainly D0 3 phase with a fraction of bcc phase.2

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supporting

confidence: 82%

Section: Discussionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Mössbauer spectroscopy and neutron diffraction study of magnetostrictive, melt-spun Fe–Ga alloy ribbons

Mellors

Zhao

Simmons

et al. 2012

Journal of Magnetism and Magnetic Materials

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“…This indicates a decrease of the s-electron density at the 57 Fe nucleus at the Fe/GaAs interface. This effect can be explained by interdiffused Ga and/or As neighboring atoms of 57 Fe in the bcc-Fe lattice, since positive isomer shifts are typically observed for Fe 1−x Ga x and Fe 1−x As x solid solutions [113,114].…”

Section: Ferromagnet/semiconductor Heterostructures: Fe On Gaas(001)mentioning

confidence: 98%

Application of Mössbauer spectroscopy in magnetism

Keune

2012

Hyperfine Interact

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An overview is provided on our recent work that applies 57 Fe Mössbauer spectroscopy to specific problems in nanomagnetism. 57 Fe conversion electron Möss-bauer spectroscopy (CEMS) in conjunction with the 57 Fe probe layer technique as well as 57 Fe nuclear resonant scattering (NRS) were employed for the study of various nanoscale layered systems: (i) metastable fct-Fe; a strongly enhanced hyperfine magnetic field B hf of ∼39 T at 25 K was observed in ultrahigh vacuum (UHV) on uncoated three-monolayers thick epitaxial face-centered tetragonal (fct) 57 Fe(110) ultrathin films grown by molecular-beam epitaxy (MBE) on vicinal Pd(110) substrates; this indicates the presence of enhanced Fe local moments, μ Fe , as predicted theoretically; (ii) Fe spin structure; by applying magnetic fields, the Fe spin structure during magnetization reversal in layered (Sm-Co)/Fe exchange spring magnets and in exchange-biased Fe/MnF 2 bilayers was proven to be non-collinear and depth-dependent; (iii) ferromagnet/semiconductor interfaces for electrical spin injection; CEMS was used as a diagnostic tool for the investigation of magnetism at the buried interface of Fe electrical contacts on the clean surface of GaAs(001) and GaAs(001)-based spin light-emitting diodes (spin LED) with in-plane or out-ofplane Fe spin orientation; the measured rather large average hyperfine field of ∼27 T at 295 K and the distribution of hyperfine magnetic fields, P(B hf ), provide evidence for the absence of magnetically "dead" layers and the existence of relatively large Fe moments (μ Fe ∼ 1.8 μ B ) at the ferromagnet/semiconductor interface. -Finally, a short outlook is given for potential applications of Mössbauer spectroscopy on topical subjects of nanomagnetism/spintronics.

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The Mössbauer studies of Fe–23 at% Be alloy aged above 400°C

Yagisawa¹

1973

Phys. Stat. Sol. (a)

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Mössbauer spectra have been studied for a Fe–23 at% Be alloy aged at various temperatures. The spectra were analysed by computer to obtain information on beryllium concentrations, hyperfine fields in the matrix and the precipitate, and the volume fraction of precipitates. The Be concentrations in the matrices thus obtained are in reasonable agreement with those estimated from the lattice parameter measured by an X‐ray method. The hyperfine field at Fe atoms in the matrix is found to decrease by about 13.1 kOe whenever its nearest neighbours of Fe atoms are replaced by a Be atom, and by about 6.6 kOe whenever its next nearest neighbours are replaced. The hyperfine field of the precipitate of the metastable phase formed in a specimen aged at 600°C coincides with that of the stable phase formed in a specimen aged at 650°C, suggesting that the crystal structure of the metastable phase is of MgCu2‐type.

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Mössbauer Study of Hyperfine Magnetic Interactions in Fe-Ga Solid Solutions

Cited by 29 publications

References 15 publications

A Mössbauer spectroscopy and neutron diffraction study of magnetostrictive, melt-spun Fe–Ga alloy ribbons

A Mössbauer spectroscopy and neutron diffraction study of magnetostrictive, melt-spun Fe–Ga alloy ribbons

Application of Mössbauer spectroscopy in magnetism

The Mössbauer studies of Fe–23 at% Be alloy aged above 400°C

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