Spin-wave propagation steered by electric field modulated exchange interaction

Wang, Sheng; Guan, Xiaoxu; Cheng, Xiaomin; Chen, Lian; Huang, Ting; Miao, Xiangshui

doi:10.1038/srep31783

Cited by 9 publications

(4 citation statements)

References 36 publications

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“…The feasibility of the electrical manipulation of spin-wave propagation in ultrathin Fe films through modulation of the exchange interaction by the electric field applied perpendicular to the magnetic film has been shown just recently in Ref. [29]. Of particular interest is also the effect of the voltage-controlled magnetic anisotropy, which manifests itself as a variation of the perpendicular magnetic anisotropy at the interface between a ferromagnetic metal and an insulator under the application of an interface voltage (see, e.g., [30,31] and references therein).…”

Section: Conclusion and Summarymentioning

confidence: 99%

Electric-field control of spin-wave power flow and caustics in thin magnetic films

2018

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An external electric field can modify the strength of the spin-orbit interaction between spins of ions in magnetic crystals. This influence leads to a spin-wave frequency shift that is linear in both the applied electric field and the wave vector of the spin wave. Here we study theoretically the external electric field as a means of control of the spin-wave power flow in thin ferromagnets. The spin-wave group velocity and focusing patterns are obtained from the slowness (isofrequency) curves by evaluating their curvature at each point of the reciprocal space. We show that the combination of the magnetodipole interaction and the electric field can result in nonreciprocal unidirectional caustic beams of dipole-exchange spin waves. We demonstrate that the degree of asymmetry of the spin-wave power flow can be tuned with the external electric field. Our findings open a novel avenue for spin-wave manipulation and development of electrically tunable magnonic devices.

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Section: Conclusion and Summarymentioning

confidence: 99%

Electric-field control of spin-wave power flow and caustics in thin magnetic films

2018

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“…However, establishing spin wave-based transport as a viable solution for the next generation of electronics poses several challenges that need to be resolved to enable logic operations 7 (e.g. effective spin wave signal generation, propagation, control and detection) 5,6,[8][9][10][11][12] . At a fundamental level, there are still many outstanding questions concerning how magnetic properties and excitations evolve and emerge in low dimensional systems, such as thin films [13][14][15] .…”

mentioning

confidence: 99%

Tuning spin excitations in magnetic films by confinement

et al. 2021

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Spin excitations of magnetic thin films are the founding element for novel transport concepts in spintronics, magnonics, and magnetic devices in general. While spin dynamics have been extensively studied in bulk materials, their behaviour in mesoscopic films is less known due to experimental limitations. Here, we employ Resonant Inelastic X-Ray Scattering to investigate the spin excitation spectrum in mesoscopic Fe films, from bulk-like down to 3 unit cells thick. In bulk-like samples, we find isotropic, dispersive ferromagnons consistent with the dispersion observed by neutron scattering in bulk single crystals. As the thickness is reduced, these ferromagnons survive and evolve anisotropically: renormalising to lower energies along the out-of-plane direction while retaining their dispersion in the in-plane direction. This thickness dependence is captured by simple Heisenberg model calculations accounting for the confinement in the out-of-plane direction through the loss of Fe bonds. Our findings highlight the effects of mesoscopic scaling on spin dynamics and identify thickness as a knob for fine-tuning and controlling magnetic properties in films.

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“…Up to now, it has been shown that the graded magnonic refractive index can be created by modification of the material properties, such as non-uniform saturation magnetization or exchange constant [ 44 , 45 , 46 , 47 ], the magnetic anisotropy [ 19 , 20 ] or the internal magnetic field [ 37 , 48 ]. This index can be also achieved by utilizing a non-uniform external magnetic field [ 39 , 49 , 50 , 51 ], electric field (voltage) [ 52 , 53 ] or temperature [ 54 , 55 ]. Therefore, graded-index magnonics are expected to overcome the current limitation of magnonics and pave feasible routes for the implementation of spin-wave devices.…”

Section: Introductionmentioning

confidence: 99%

Magnonic Metamaterials for Spin-Wave Control with Inhomogeneous Dzyaloshinskii–Moriya Interactions

Zhuo

Cheng

et al. 2022

Nanomaterials

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A magnonic metamaterial in the presence of spatially modulated Dzyaloshinskii–Moriya interaction is theoretically proposed and demonstrated by micromagnetic simulations. By analogy to the fields of photonics, we first establish magnonic Snell’s law for spin waves passing through an interface between two media with different dispersion relations due to different Dzyaloshinskii–Moriya interactions. Based on magnonic Snell’s law, we find that spin waves can experience total internal reflection. The critical angle of total internal reflection is strongly dependent on the sign and strength of Dzyaloshinskii–Moriya interaction. Furthermore, spin-wave beam fiber and spin-wave lens are designed by utilizing the artificial magnonic metamaterials with inhomogeneous Dzyaloshinskii–Moriya interactions. Our findings open up a rich field of spin waves manipulation for prospective applications in magnonics.

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Spin-wave propagation steered by electric field modulated exchange interaction

Cited by 9 publications

References 36 publications

Electric-field control of spin-wave power flow and caustics in thin magnetic films

Electric-field control of spin-wave power flow and caustics in thin magnetic films

Tuning spin excitations in magnetic films by confinement

Magnonic Metamaterials for Spin-Wave Control with Inhomogeneous Dzyaloshinskii–Moriya Interactions

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