Hyperfine field distributions and magnetic properties of melt-spun and sputtered Fe-rich Fe-Zr amorphous alloys

Read, D.A.; Moyo, T.; Jassim, Suad; Dunlap, R. A.; Hallam, G.C.

doi:10.1016/0304-8853(89)90067-x

Cited by 30 publications

(14 citation statements)

References 13 publications

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“…In the CuYNi oxide, on the other hand, the count rate increases linearly with temperature beyond T N . Similar effects have been observed in a sputtered Fe 0.91 Zr 0.09 amorphous alloy [7], and in measurements on NiFe 2 O 4 . This behaviour could be characteristic of antiferromagnetic interactions in material, and is being investigated further.…”

Section: Resultssupporting

confidence: 74%

Mössbauer Studies on (Zn, Cd, Cu)0.5Ni0.5Fe2O4 Oxides

et al. 2004

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The temperature dependence of the magnetic hyperfine fields on 57 Fe nuclei at the tetrahedral (A) and octahedral (B) interstitial sites in (Zn, Cd, Cu) 0.5 Ni 0.5 Fe 2 O 4 oxides have been investigated in Mössbauer measurements at sample temperatures ranging from 79 K to 850 K. The samples were prepared by solid-state reaction, and their phase determined from XRD measurements, which also provided information on their X-ray densities, grain sizes and lattice constants. The magnetic transition temperatures between ordered and paramagnetic states were obtained from zero-velocity measurements. The Cu 0.5 Ni 0.5 Fe 2 O 4 sample is found to be antiferromagnetic with Néel temperature of 823 K, and its super-exchange interactions, J AB , J AA and J BB were determined to be j24.14 k B , j13.10 k B and +11.68 k B , respectively. The (Zn, Cd) 0.5 Ni 0.5 Fe 2 O 4 are ferrimagnetic with Curie points of 543 and 548 K, respectively, and corresponding average exchange integrals J o = 186 k B and 188 k B .

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Section: Resultssupporting

confidence: 74%

Mössbauer Studies on (Zn, Cd, Cu)0.5Ni0.5Fe2O4 Oxides

et al. 2004

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“…The low field sites (LFS) correspond to the Fe-rich regions within the amorphous state (clusters), while high field sites (HFS) can be ascribed to the Fe-poor regions (amorphous matrix) [11]. The single sextet, owing to its values of the hyperfine field induction (33.970.2 T) and…”

Section: Resultsmentioning

confidence: 99%

“…It is also shown that Fe-rich Fe-Zr alloys can be treated as Heisenberg ferromagnets. Read et al [11] introduced the model of clusters containing the antiferromagneticaly coupled Fe moments embedded in ferromagnetic matrix in order to explain the temperature dependence of the coercivity in Fe-rich Fe-Zr amorphous alloys. Despite the controversy, it is widely believed that Fe atoms in amorphous Fe-rich Fe-Zr alloys are in low and high spin state giving rise to the bimodal hyperfine magnetic induction distribution and that their magnetic structure depends on preparation conditions.…”

Section: Introductionmentioning

confidence: 99%

Medium range ordering and some magnetic properties of amorphous Fe90Zr7B3 alloy

Świerczek

2010

Journal of Magnetism and Magnetic Materials

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“…The concentration dependence of T C in a-Fe±Mn±Zr alloys can be ascribed to the variation in spin-structure and its correlation length resulting from the effect of composition on the number of antiferromagnetic Fe±Zr interactions. The actual microscopic changes in the spin-structures at the spinglass freezing temperature are still unclear, although it is normally assumed that either individual antiferromagnetically coupled spins appear [25] or that ferromagnetic [27] or antiferromagnetic [28] clusters embedded in the ferromagnetic matrix behave as superparamagnetic particles with their moments being frozen in random orientations below T f . With increasing Mn concentration frustration from increased antiferromagnetic coupling gives rise to a random spin structure and the resulting ferromagnetic region becomes narrower in temperature.…”

Section: Resultsmentioning

confidence: 99%

An ac Susceptibility Study of Mn Substituted Amorphous FeZr Alloys

Perumal¹,

Srinivas²,

Dhar³

et al. 2000

phys. stat. sol. (a)

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The temperature dependence of the ac susceptibility of amorphous Fe 90Àx Mn x Zr 10 (x 0, 4, 8) has been measured at different ac fields in the frequency range of 80 Hz to 1 kHz. All the compositions of the present study exhibit a double magnetic transition below room temperature. It is found that the Curie temperature T C decreases while the spin-glass transition temperature T f increases as Mn concentration increases from 0 to 8 at%. The values of T C and critical exponent associated with the magnetic susceptibility were extracted from ac susceptibility measurements. The critical exponent is in close agreement with the value predicted by the three-dimensional Heisenberg model. The results obtained here can be explained on the basis of competing exchange interactions below the magnetic ordering temperature.

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Hyperfine field distributions and magnetic properties of melt-spun and sputtered Fe-rich Fe-Zr amorphous alloys

Cited by 30 publications

References 13 publications

Mössbauer Studies on (Zn, Cd, Cu)0.5Ni0.5Fe2O4 Oxides

Mössbauer Studies on (Zn, Cd, Cu)0.5Ni0.5Fe2O4 Oxides

Medium range ordering and some magnetic properties of amorphous Fe90Zr7B3 alloy

An ac Susceptibility Study of Mn Substituted Amorphous FeZr Alloys

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