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Ok, Hang Nam; Morrish, A. H.

doi:10.1103/physrevb.23.2257

Cited by 122 publications

(23 citation statements)

References 8 publications

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“…2. The onset of crystallization at the sample surface, occurring at lower annealing temperatures (TA) than the bulk crystallization temperatures (Ti), can be interpreted in a similar way as in earlier studies of the surface crystallization of conventional amorphous alloys [14,15]. Most probably some boron atoms escape from the surface region during melt spinning process and during annealing.…”

Section: Introductionmentioning

confidence: 56%

Transmission and Conversion Electron Mössbauer Study of Crystallization of Amorphous FeZrB Alloys

Grabias

Kopcewicz

1999

Acta Phys. Pol. A

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The combined conversion electron emission and y-transmission Massbauer spectroscopy are used to investigate the differences in the bulk and surface crystallization of the amorphous FeZrB alloy in which the nanocrystalline bcc-Fe phase was formed due to annealing. The measurements were performed for the ribbons in the as-quenched state, after 1 h annealing at 430-600°C and after short time annealing at 600°C. The clear differences m the surface and bulk crystallization behaviours were detected. Not only the surface crystallization starts at lower annealing temperature than the bulk one, but additional phases were detected at the surface which do not form in the bulk. Structural transformations as a function of annealing time (15-120 s) are compared with those induced by 1 h anneals. The enhanced surface crystallization was attributed to the boron depletion of the surface • region which leads to the decrease in the crystallization temperature at the surface.

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Section: Introductionmentioning

confidence: 56%

Transmission and Conversion Electron Mössbauer Study of Crystallization of Amorphous FeZrB Alloys

Grabias

Kopcewicz

1999

Acta Phys. Pol. A

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“…And then we can obtain the best fit for the amorphous phase at θ = 0.0293 • . This means that the amorphous phase has a perpendicular anisotropy like Fe 82 B 12 Si 6 (METGLAS) produced by melt spinning [8].…”

Section: Resultsmentioning

confidence: 99%

Mössbauer study of intergranular phase in Nd 8 Fe86 − x Nb x B6(x = 0, 1, 2, 3) nanocomposite magnet

Kim

Baek

et al. 2008

Hyperfine Interact

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Nd 8 Fe 86−x Nb x B 6 (x = 0, 1, 2, 3) nanocomposite magnet has been studied by Mössbauer spectroscopy and nanostructure observation. It was found that intergranular phase formed between α-Fe and Nd 2 Fe 14 B phase in NdFeNbB alloys plays a significant role on the magnetic properties. By the addition of Nb into Nd 8 Fe 86 B 6 composition, coercivity was found to increase by 25% due to the grain refinement of both the soft and hard magnetic phases which was decreased from 50 nm of virgin Nd 8 Fe 86 B 6 to 25 nm in Nd 8 Fe 85 Nb 1 B 6 alloys. The role of Nb addition was confirmed to stabilize the Nd 2 Fe 14 B lattice preventing from thermal vibration of the corresponding sites at where Fe atoms are substituted by Nb in the Nd 2 Fe 14 B lattice. The enhanced coercivity was originated from the exchange hardening of soft and amorphous phases surrounding the hard magnetic Nd 2 Fe 14 B crystal.

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“…Anyhow, the contribution of two types of magnetic anisotropies could be discerned: (i) uniaxial anisotropy, which results from the shape anisotropy, and (ii) fourfold anisotropy, which results from the presence of crystallites (in bcc arrangement), embedded in the residual amorphous matrix. Indeed, it is important to mention that (i) the magnetic texture is not homogeneous in an amorphous alloy and is rather perpendicular to the ribbon plane for Fe containing alloys, because of the positive magnetostriction [5], (ii) the surface displays a crystalline fraction larger than that of the bulk [14] which (iii) thus favours a perpendicular magnetic texture [15]. Table 2 summarizes the refined quantities, namely isotropic K 0 , fourfold K 1 , and uniaxial K u anisotropy constants and respective angles ϕ 1 and ϕ u which characterise the orientations of the anisotropy axes.…”

Section: Moke Measurementsmentioning

confidence: 99%

Effect of annealing in an external magnetic field on the magnetic texture of Mo-containing nanocrystalline alloys

et al. 2006

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The magnetic texture of (Fe1−xCox)76Mo8Cu1B15 (x = 0, 0.5) nanocrystalline alloys is studied for different amounts of nanocrystalline grains. The originally amorphous alloys were annealed in external longitudinal and transverse magnetic fields of 0.025 T and 0.8 T, respectively. Mössbauer measurements were carried out at room and liquid nitrogen temperatures in order to gain information on the hyperfine interactions and the orientation of the magnetization. The obtained results are compared with those received from zero-field annealed samples. Magneto-optical Kerr effect (MOKE) was applied for the investigation of possible changes at the surface of the x = 0 ribbon as a function of annealing temperature and applied magnetic field. A combination of uniaxial anisotropy, which originates from the shape anisotropy, and four-fold anisotropy, which is a contribution from crystallites of nanometre size embedded in the residual amorphous matrix, is unveiled.

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Origin of the perpendicular anisotropy in amorphousFe82B12

Cited by 122 publications

References 8 publications

Transmission and Conversion Electron Mössbauer Study of Crystallization of Amorphous FeZrB Alloys

Transmission and Conversion Electron Mössbauer Study of Crystallization of Amorphous FeZrB Alloys

Mössbauer study of intergranular phase in Nd 8 Fe86 − x Nb x B6(x = 0, 1, 2, 3) nanocomposite magnet

Effect of annealing in an external magnetic field on the magnetic texture of Mo-containing nanocrystalline alloys

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