Spin waves in antiferromagnetic fct Mn(17%Ni) alloy

Jankowska-Kisielińska, J.; Mikke, K.; Milczarek, J.J.

doi:10.1016/0304-8853(94)00843-4

Cited by 7 publications

(7 citation statements)

References 7 publications

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“…Thus, we can combine all individual energy-momentum data points to a dispersion curve and obtain the spin wave velocity of 160 AE 10 meV # A by fitting the results with the dispersion relation E 2 k ¼ E 2 g þ ½v sinðkaÞ=a 2 of antiferromagnetic spin waves, where E k is the spin wave energy, E g is the energy gap, a is the interlayer distance, and v is the spin wave velocity. In comparison, we plotted the extrapolated INS data of Ni doped fcc Mn [18]. The dispersion curve of Ni doped fcc Mn is slightly steeper than our STM results, but in general agrees well with our findings.…”

supporting

confidence: 90%

“…3. As has been demonstrated in the INS experiments [18], the damping increases linearly with the wave vector (or the energy) in the first order approximation. We can use a simple linear equation ÀðkÞ ¼ À 0 þ À 1 k to fit the data and gives À 0 ¼ 2 meV and À 1 ¼ 39 AE 2 meV # A.…”

mentioning

confidence: 73%

“…2. The extrapolated neutron scattering data is from [18]. The fcc and fct Mn dispersions were obtained by ab initio calculations.…”

mentioning

confidence: 99%

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Spin Wave Dispersion on the Nanometer Scale

et al. 2008

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Hot electrons injected into antiferromagnetic Mn layers from the tip of a low temperature scanning tunneling microscope have been used to determine the energies, lifetimes, and momenta of antiferromagnetic spin waves on the nanometer scale. The spin waves show a linear dispersion with a velocity of 160+/-10 meV A and lifetimes that scale linearly with energy in agreement with neutron scattering and theory. It is shown that the method is sensitive enough to detect the influence of surface anisotropies on the spin wave dispersion.

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confidence: 90%

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confidence: 73%

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Spin Wave Dispersion on the Nanometer Scale

et al. 2008

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“…The obtained energy-gap value is E g = 3.0 ± 0.04 meV for 293 K and E g = 4.4 ± 0.2 meV for 15 K. The E g values are similar to those found for Mn 0.62 Ni 0.38 [2] and Mn 0.73 Ni 0.27 [6] indicating that the E g is independent of the alloy concentration in the range (0.27-0.38 Ni), which is in contrast to its strong dependence in the region of the fct-fcc transition [5,8].…”

Section: Resultssupporting

confidence: 81%

Anisotropy of the Neutron Scattering in the Paramagnetic Phase and on the Spin Waves in the Mn_0.71Ni_0.29Alloy

Jankowska-Kisielińska

Fijał-Kirejczyk

Mikke

2009

Acta Phys. Pol. A

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We have confirmed the significant anisotropy of the generalised magnetic susceptibility in the paramagnetic and antiferromagnetic phase of the fcc Mn-Ni alloys. In this paper the detailed account of the experiments performed on the Mn 0.71 Ni 0.29 alloy is given. Our main result for the paramagnetic phase is that the correlation length is larger for the direction parallel to the anisotropy axis than for the perpendicular one by a factor of 1.6. The spin-wave velocity observed at 15 K is higher for the direction parallel to the anisotropy axis than that for the perpendicular direction by a factor of 1.2. These results are similar to that for the Mn 0.62 Ni 0.38 alloy. Our results indicate that the magnetic carriers are more localized and the magnetic interactions are less extended in alloys with higher Ni concentration.

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“…However, our systematic studies demonstrated the essential differences between these two systems [4][5][6][7][8]. Within this program the inelastic neutron scattering (INS) in the FCC Mn (37%Fe,3%Cu) alloy was measured.…”

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confidence: 99%

Magnetic excitations in FCC Mn (37%Fe, 3%Cu) alloy

Mikke

Jankowska-Kisielińska

Hennion

2006

Phys. Status Solidi (c)

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PACS 75.20. En, 75.30.Ds, 75.40.Gb Within the program of our systematic studies of magnetic excitations of manganese alloys the inelastic neutron scattering in FCC Mn(37%Fe,3%Cu) was measured for the temperature range 1.7-600 K. This alloy has the FCC crystal structure both in paramagnetic and AF phase and its composition is close to the range where the enhanced itinerant behaviour was predicted by the theory. The measured spin-wave velocity and the energy gap in the spin wave spectrum were reported earlier to reach the maximum values in this composition range. Our data did not confirm these earlier results. The expected anisotropy of the inelastic neutron scattering was not found neither in the antiferromagnetic phase nor in the paramagnetic one. The q-dependence of the spin-wave damping is quadratic rather than linear and the spin-wave damping increase with temperature, as usually predicted for damping due to magnon scattering on magnons and on other excitations. This result is in contrast with the data for the FCT Mn(10%Fe,3%Cu) where the qdependence of the spin-wave damping is linear and the damping parameter was found to be temperature independent excepting the region close to T N .

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Spin waves in antiferromagnetic fct Mn(17%Ni) alloy

Cited by 7 publications

References 7 publications

Spin Wave Dispersion on the Nanometer Scale

Spin Wave Dispersion on the Nanometer Scale

Anisotropy of the Neutron Scattering in the Paramagnetic Phase and on the Spin Waves in the Mn_0.71Ni_0.29Alloy

Magnetic excitations in FCC Mn (37%Fe, 3%Cu) alloy

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Spin waves in antiferromagnetic fct Mn(17%Ni) alloy

Cited by 7 publications

References 7 publications

Spin Wave Dispersion on the Nanometer Scale

Spin Wave Dispersion on the Nanometer Scale

Anisotropy of the Neutron Scattering in the Paramagnetic Phase and on the Spin Waves in the Mn0.71Ni0.29Alloy

Magnetic excitations in FCC Mn (37%Fe, 3%Cu) alloy

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Anisotropy of the Neutron Scattering in the Paramagnetic Phase and on the Spin Waves in the Mn_0.71Ni_0.29Alloy