Magnon dispersion in thin magnetic films

Balashov, T.; Buczek, Paweł; Sandratskii, L. M.; Ernst, A.; Wulfhekel, Wulf

doi:10.1088/0953-8984/26/39/394007

Cited by 27 publications

(16 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The magnetic susceptibility can be readily computed for a finite fragment of an infinite crystal by means of the direct inversion of the Iz − gST matrix. In parallel to this real-space technique, it is useful to consider the Fourier transformation of the susceptibility, since this quantity can be directly probed in a scattering experiment, e.g., SPEELS [31] or STM [2]. We consider a supercell featuring periodic boundary conditions, so that the Fourier transformation of the susceptibility…”

Section: Direct Numerical Averagingmentioning

confidence: 99%

“…The spin excitations (SEs) in magnets with reduced dimensionality, including wires and thin films, attract strong interest from the experimental, theoretical, and applied physics perspective. Impressive experimental progress, in particular the inelastic scanning tunneling microscopy [1,2] and spinpolarized electron energy loss spectroscopy (SPEELS) [3][4][5], allows us to probe directly their properties.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnons in disordered nonstoichiometric low-dimensional magnets

et al. 2016

View full text Add to dashboard Cite

We study spin excitation spectra of one-, two-, and three-dimensional magnets featuring nonmagnetic defects at a wide range of concentrations. Taking the Heisenberg model as the starting point, we tackle the problem by both direct numerical simulations in large supercells and using a semianalytic coherent-potential approximation. We consider the properties of the excitations in both direct and reciprocal spaces. In the limits of the concentration c of the magnetic atoms tending to 0 or 1 the properties of the spin excitations are similar in all three dimensions. In the case of a low concentration of magnetic atoms the spin excitation spectra are dominated by the modes confined in the real space to single atoms or small clusters and delocalized in the reciprocal space. In the limit of c tending to 1, we obtain the spin-wave excitations delocalized in the real space and localized in the reciprocal space. However, for the intermediate concentrations the properties of the spin excitations are strongly dimensionality dependent. We pay particular attention to the formation, with increase of c, of the Lorentzian-shaped peaks in the spectral densities of the spin excitations, which can be regarded as magnon states with a finite lifetime given by the width of the peaks. In general, low-dimensional magnets are more strongly affected by the presence of nonmagnetic impurities than their bulk counterparts. The details of the electronic structure, varying with the dimensionality and the concentration, substantially influence the spin excitation spectra of real materials, as we show in the example of the FeAl alloy.

show abstract

Section: Direct Numerical Averagingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnons in disordered nonstoichiometric low-dimensional magnets

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Electrons have a much larger scattering cross section than neutrons (routinely used to probe spin-waves in bulk materials), which compensates for the much smaller scattering volume of a thin magnetic film. Recently, another kind of inelastic electron spectroscopy was shown to be able to detect spin-wave modes, utilizing scanning tunneling microscopy 14 . This can be seen as a real-space complementary technique to the reciprocal space picture afforded by (SP)EELS.…”

Section: Introductionmentioning

confidence: 99%

First-principles investigation of spin-wave dispersions in surface-reconstructed Co thin films on W(110)

2017

View full text Add to dashboard Cite

We computed spin-wave dispersions of surface-reconstructed Co films on the W(110) surface in the adiabatic approximation. The magnetic exchange interactions are obtained via first-principles electronic-structure calculations using the Korringa-Kohn-Rostoker Green-function method. We analyze the strength and oscillatory behavior of the intralayer and interlayer magnetic interactions and investigate the resulting spin-wave dispersions as a function of the thickness of Co films. In particular, we highlight and explain the strong impact of hybridization of the electronic states at the Co-W interface on the magnetic exchange interactions and on the spin-wave dispersions. We compare our results to recent measurements based on electron-energy-loss spectroscopy [E. Michel, H. Ibach, and C.M. Schneider, Phys. Rev. B 92, 024407 (2015)]. Good overall agreement with experimental findings can be obtained by considering the possible overestimation of the spin splitting, stemming from the local-spin-density approximation, and adopting an appropriate correction.

show abstract

“…Note that in order to have a good agreement between theory and experiment, the calculated exchange parameters from first principles [68] are down-scaled to 85% of their values. Interestingly, the confined magnon modes of Co films have also been probed by ISTS [55]. The measurements are performed for different thicknesses of Co films from 3 to 9 ML.…”

Section: Co Films On Cu(001) and W(110)mentioning

confidence: 99%

Probing of the interfacial Heisenberg and Dzyaloshinskii–Moriya exchange interaction by magnon spectroscopy

Zakeri

2016

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Abstract. This Topical Review presents an overview of the recent experimental results on the quantitative determination of the magnetic exchange parameters in ultrathin magnetic films and multilayers, grown on different substrates. The experimental approaches to probe both the symmetric Heisenberg as well as the antisymmetric Dzyaloshinskii-Moriya exchange interaction in ultrathin magnetic films and at interfaces are discussed in detail. It is explained how the experimental spectrum of magnetic excitations can be used to quantify the strength of these interactions.

show abstract

Magnon dispersion in thin magnetic films

Cited by 27 publications

References 31 publications

Magnons in disordered nonstoichiometric low-dimensional magnets

Magnons in disordered nonstoichiometric low-dimensional magnets

First-principles investigation of spin-wave dispersions in surface-reconstructed Co thin films on W(110)

Probing of the interfacial Heisenberg and Dzyaloshinskii–Moriya exchange interaction by magnon spectroscopy

Contact Info

Product

Resources

About