Band structure of magnetic excitations in the vortex phase of a ferromagnetic superconductor

Bespalov, A. A.; Buzdin, Alexandre I.

doi:10.1103/physrevb.87.094509

Cited by 4 publications

(9 citation statements)

References 19 publications

(22 reference statements)

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“…7,8 A number of papers has been devoted to theoretical investigation of the magnon spectrum in magnetic superconductors. 5,6,[9][10][11][12][13] Buzdin 9 determined the magnon spectrum in a superconducting antiferromagnet with an easy-axis anisotropy. Different types of spin waves in ferromagnetic superconductors in the Meissner state have been studied by Braude,Sonin and Logoboy,5,6,10,11 including surface waves and domain wall waves.…”

Section: Introductionmentioning

confidence: 99%

“…12 coupled magnetic moment-vortex dynamics has been studied in the limit of long wavelength λ w ≫ a, where a is the inter-vortex distance. Later, 13 this analysis has been extended to the case λ w a. It has been demonstrated that in the presence of a vortex lattice the magnon spectrum acquires a Bloch-like band structure.…”

Section: Introductionmentioning

confidence: 99%

“…Note that this procedure can be applied also to ordinary ferromagnets, but in all cases the high quality crystalline surface is required. The surface impedance has been calculated for a ferromagnetic superconductor in the Meissner state 5,6 and in the mixed state 13 for a static vortex lattice.…”

Section: Introductionmentioning

confidence: 99%

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Magnon radiation by moving Abrikosov vortices in ferromagnetic superconductors and superconductor-ferromagnet multilayers

2014

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In systems combining type-II superconductivity and magnetism the non-stationary magnetic field of moving Abrikosov vortices may excite spin waves, or magnons. This effect leads to the appearance of an additional damping force acting on the vortices. By solving the London and Landau-Lifshitz-Gilbert equations we calculate the magnetic moment induced force acting on vortices in ferromagnetic superconductors and superconductor/ferromagnet superlattices. If the vortices are driven by a dc force, magnon generation due to the Cherenkov resonance starts as the vortex velocity exceeds some threshold value. For an ideal vortex lattice this leads to an anisotropic contribution to the resistivity and to the appearance of resonance peaks on the current voltage characteristics. For a disordered vortex array the current will exhibit a step-like increase at some critical voltage. If the vortices are driven by an ac force with a frequency ω, the interaction with magnetic moments will lead to a frequency-dependent magnetic contribution ηM to the vortex viscosity. If ω is below the ferromagnetic resonance frequency ωF , vortices acquire additional inertia. For ω > ωF dissipation is enhanced due to magnon generation. The viscosity ηM can be extracted from the surface impedance of the ferromagnetic superconductor. Estimates of the magnetic force acting on vortices for the U-based ferromagnetic superconductors and cuprate/manganite superlattices are given.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnon radiation by moving Abrikosov vortices in ferromagnetic superconductors and superconductor-ferromagnet multilayers

2014

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“…Experimental evidence of the incomplete Meissner effect in the ferromagnetic superconductors [3,4,6] suggests that they exhibit a spontaneous vortex state even in the absence of an external magnetic field. So far only two papers have addressed the magnon spectrum in the mixed state of a ferromagnetic superconductor [13,14]. Ng and Varma [13] studied long-wavelength magnons: then, the Abrikosov vortex lattice can be treated within the continuous medium approximations.…”

Section: Introductionmentioning

confidence: 99%

“…Ng and Varma [13] studied long-wavelength magnons: then, the Abrikosov vortex lattice can be treated within the continuous medium approximations. In the limit of short wavelengths [14], the magnon spectrum acquires a Bloch-like band structure due to the Bragg scattering on the vortex lattice.…”

Section: Introductionmentioning

confidence: 99%

Microwave and dc response of an Abrikosov vortex lattice in ferromagnetic superconductors

Bespalov

Mel’nikov

Buzdin

2014

Physica C: Superconductivity and its Applications

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International audienceIn magnetic superconductors the magnetic flux dynamics is influenced by the interaction of vortices with the magnetization. This interaction leads to the appearance of an additional damping force acting on the vortices. By solving the London and Landau-Lifshitz-Gilbert equations we analyze the ac and dc responses of a ferromagnetic superconductor in the mixed state. If the vortices are driven by an ac force, their viscosity is enhanced due to the generation of magnons. This viscosity enhancement affects the surface impedance of the sample. In the case of a dc driving current vortices start to radiate magnons when their velocity exceeds a threshold value. As a result, either a step-like feature or a series of peaks appear on the I-V curve

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Magnon–fluxon interaction in a ferromagnet/superconductor heterostructure

et al. 2019

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Ferromagnetism and superconductivity are most fundamental phenomena in condensed matter physics. Entailing opposite spin orders, they share an important conceptual similarity: Disturbances in magnetic ordering in magnetic materials can propagate in the form of spin waves (magnons) while magnetic fields penetrate superconductors as a lattice of magnetic flux quanta (fluxons). Despite a rich choice of wave and quantum phenomena predicted, magnon-fluxon coupling has not been observed experimentally so far. Here, we clearly evidence the interaction of spin waves with a flux lattice in ferromagnet/superconductor Py/Nb bilayers. We demonstrate that, in this system, the magnon frequency spectrum exhibits a Bloch-like band structure which can be tuned by the biasing magnetic field. Furthermore, we observe Doppler shifts in the frequency spectra of spin waves scattered on a flux lattice moving under the action of a transport current in the superconductor.

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Band structure of magnetic excitations in the vortex phase of a ferromagnetic superconductor

Cited by 4 publications

References 19 publications

Magnon radiation by moving Abrikosov vortices in ferromagnetic superconductors and superconductor-ferromagnet multilayers

Magnon radiation by moving Abrikosov vortices in ferromagnetic superconductors and superconductor-ferromagnet multilayers

Microwave and dc response of an Abrikosov vortex lattice in ferromagnetic superconductors

Magnon–fluxon interaction in a ferromagnet/superconductor heterostructure

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