Magnons in ferromagnetic metallic manganites

Zhang, Jiandi; Ye, Feng; Sha, Hao; Dai, Pengcheng; Fernandez-Baca, J. A.; Plummer, E. W.

doi:10.1088/0953-8984/19/31/315204

Cited by 47 publications

(72 citation statements)

References 108 publications

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“…We determined from our global best fit that J F 1 = 9.01 ± 0.02 meV. This value is comparable to that measured in PCSMO (11.39 ± 0.05 meV) 39 , La 0.5 Sr 1.5 MnO 4 (9.98 meV) 41 , the AFM CO phases of Nd 0.5 Sr 0.5 MnO 3 (6.76 meV) 42 , and a little larger than the typical values for the FM double exchange in metallic FM manganites 37,59 . In other words, it is consistent with its origin being due to double exchange.…”

Section: A Goodenough Modelsupporting

confidence: 78%

Spin excitations used to probe the nature of exchange coupling in the magnetically ordered ground state ofPr0.5Ca0.5MnO3

et al. 2016

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Spin excitations used to probe the nature of the exchange coupling in the magnetically ordered ground state of Pr 0.5 Ca 0. We have used time-of-flight inelastic neutron scattering to measure the spin wave spectrum of the canonical half-doped manganite Pr0.5Ca0.5MnO3 in its magnetic and orbitally ordered phase. The data, which cover multiple Brillouin zones and the entire energy range of the excitations, are compared with several different models that are all consistent with the CE-type magnetic order, but arise through different exchange coupling schemes. The Goodenough model, i.e. an ordered state comprising strong nearest neighbor ferromagnetic interactions along zig-zag chains with antiferromagnetic inter-chain coupling, provides the best description of the data, provided that further neighbor interactions along the chains are included. We are able to rule out a coupling scheme involving formation of strongly bound ferromagnetic dimers, i.e. Zener polarons, on the basis of gross features of the observed spin wave spectrum. A model with weaker dimerization reproduces the observed dispersion but can be ruled out on the basis of discrepancies between the calculated and observed structure factors at certain positions in reciprocal space. Adding further neighbor interactions results in almost no dimerization, i.e. recovery of the Goodenough model. These results are consistent with theoretical analysis of the degenerate double exchange model for half-doping, and provide a recipe for how to interpret future measurements away from half-doping, where degenerate double exchange models predict more complex ground states.

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Section: A Goodenough Modelsupporting

confidence: 78%

Spin excitations used to probe the nature of exchange coupling in the magnetically ordered ground state ofPr0.5Ca0.5MnO3

et al. 2016

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“…Obviously, the damping parameter in the FePd system is smaller than that in the Fe/W(110) system. The energy dependence of the linewidth in the FePd system is very similar to the one in the materials which are expected to exhibit a low damping, for example, yttrium iron garnet 19 and La 0.7 Ca 0.3 MnO 3 (a representative of magnetic oxides with half-metallic character) 37 . A comparison among different systems is provided in Supplementary Note 4.…”

Section: Resultsmentioning

confidence: 56%

Long-living terahertz magnons in ultrathin metallic ferromagnets

et al. 2015

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The main idea behind magnonics is to use the elementary magnetic excitations (magnons) for information transfer and processing. One of the main challenges, hindering the application of ultrafast terahertz magnons in magnonics, has been the short lifetime of these excitations in metallic ferromagnets. Here, we demonstrate that the engineering of the electronic structure of a ferromagnetic metal, by reducing its dimensionality and changing its chemical composition, opens a possibility to strongly suppress the relaxation channels of terahertz magnons and thereby enhance the magnons' lifetime. For the first time, we report on the long-lived terahertz magnons excited in ultrathin metallic alloy films. On the basis of the first-principles calculations, we explain the microscopic nature of the long lifetime being a consequence of the peculiar electronic hybridizations of the species. We further demonstrate a way of tailoring magnon energies (frequencies) by varying the chemical composition of the film.

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“…Since this issue is under debate [7,8] it is important to study spin-wave stiffness more closely, in particular, to measure D in thin films. It is also important to explore complementary techniques.…”

Section: Introductionmentioning

confidence: 99%

Spin-wave resonances inLa0.7Sr0.3MnO3films: Measurement of spin-wave stiffness and anisotropy field

et al. 2007

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We studied magnetic field dependent microwave absorption in epitaxial La 0.7 Sr 0.3 MnO 3 films using an X-band Bruker ESR spectrometer. By analyzing angular and temperature dependence of the ferromagnetic and spin-wave resonances we determine spin-wave stiffness and anisotropy field.The spin-wave stiffness as found from the spectrum of the standing spin-wave resonances in thin films is in fair agreement with the results of inelastic neutron scattering studies on a single crystal of the same composition [Vasiliu-Doloc et al., J. Appl. Phys. 83, 7343 (1998)].

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Magnons in ferromagnetic metallic manganites

Cited by 47 publications

References 108 publications

Spin excitations used to probe the nature of exchange coupling in the magnetically ordered ground state ofPr0.5Ca0.5MnO3

Spin excitations used to probe the nature of exchange coupling in the magnetically ordered ground state ofPr0.5Ca0.5MnO3

Long-living terahertz magnons in ultrathin metallic ferromagnets

Spin-wave resonances inLa0.7Sr0.3MnO3films: Measurement of spin-wave stiffness and anisotropy field

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