Spin Hall controlled magnonic microwaveguides

Demidov, V. E.; Urazhdin, Sergei; Ринкевич, А. Б.; Reiss, Günter; Demokritov, S. O.

doi:10.1063/1.4871519

Cited by 41 publications

(38 citation statements)

References 29 publications

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“…In the context of a phase-conserving, mode-and frequency-selective amplification of traveling spin waves, the process of parallel pumping has, so far, proven superior to other approaches of spin-wave amplification, such as the reduction of the spin-wave damping by spin transfer torque (STT) [24][25][26][27]. Parallel pumping, or parallel parametric amplification, results from the interaction of selected spin waves with a sufficiently large dynamic effective magnetic field, which acts in parallel to the static magnetization and features two times the frequency of these spin waves.…”

Section: Introductionmentioning

confidence: 99%

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

2017

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Magnonics and magnon spintronics aim at the utilization of spin waves and magnons, their quanta, for the construction of wave-based logic networks via the generation of pure all-magnon spin currents and their interfacing with electrical charge transport. The promise of efficient parallel data processing and low power consumption renders this field one of the most promising research areas in spintronics. In this context, the process of parallel parametric amplification, i.e., the conversion of microwave photons into magnons at one half of the microwave frequency, has proven to be a versatile tool to excite and to manipulate spin waves. Its beneficial and unique properties such as frequency and mode-selectivity, the possibility to excite spin waves in a wide wavevector range and the creation of phase-correlated wave pairs, have enabled the achievement of important milestones like the magnon Bose Einstein condensation and the cloning and trapping of spinwave packets. Parallel parametric amplification, which allows for the selective amplification of magnons while conserving their phase is, thus, one of the key methods of spin-wave generation and amplification.The application of parallel parametric amplification to CMOS-compatible micro-and nanostructures is an important step towards the realization of magnonic networks. This is motivated not only by the fact that amplifiers are an important tool for the construction of any extended logic network but also by the unique properties of parallel parametric amplification. In particular, the creation of phase-correlated wave pairs allows for rewarding alternative logic operations such as a phase-dependent amplification of the incident waves. Recently, the successful application of parallel parametric amplification to metallic microstructures has been reported which constitutes an important milestone for the application of magnonics in practical devices. It has been demonstrated that parametric amplification provides an excellent tool to generate and to amplify spin waves in these systems in a wide wavevector range. In particular, the amplification greatly benefits from the discreteness of the spin-wave spectra since the size of the microstructures is comparable to the spin-wave wavelength. This opens up new, interesting routes of spin-wave amplification and manipulation. In this Review, we will give an overview over the recent developments and achievements in this field.

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Section: Introductionmentioning

confidence: 99%

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

2017

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“…The relaxation of spin waves can be counteracted by injection of spin angular momentum to compensate for the losses. This has been demonstrated in YIG/Pt-based material systems [3], in which a charge current, driven through the Pt and tangential to the interface with YIG, excites a -via the spin Hall effect [4] -spin current that is absorbed by the magnetization in the magnetic insulator. A similar result has been obtained with the magnetic metal permalloy and Pt [5].…”

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confidence: 90%

Spin-Wave Amplification and Lasing Driven by Inhomogeneous Spin-Transfer Torques

2019

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We show that an inhomogeneity in the spin-transfer torques in a metallic ferromagnet under suitable conditions strongly amplifies incoming spin waves. Moreover, at nonzero temperatures the incoming thermally occupied spin waves will be amplified such that the region with inhomogeneous spin transfer torques emits spin waves spontaneously, thus constituting a spin-wave laser. We determine the spin-wave scattering amplitudes for a simplified model and set-up, and show under which conditions the amplification and lasing occurs. Our results are interpreted in terms of a so-called black-hole laser, and could facilitate the field of magnonics, that aims to utilize spin waves in logic and data-processing devices.

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“…Indeed, in the so-called Magnetostatic Surface Wave geometry (equilibrium magnetization oriented in the film plane, perpendicular to the SW wave-vector), the iDMI translates directly into a spin-wave frequency non-reciprocity, i.e. a difference of frequency between counterpropagating SW, [18][19][20][21] and the SHE STT translates into a current-induced modification of the spin-wave relaxation rate 22,23 . However, up to now, the two effects could not be observed simultaneously, iDMI being extracted in ultrathin films for which this interfacial effects has a very large impact but for which spin waves do not propagate far enough to determine their relaxation rate.…”

Section: Introductionmentioning

confidence: 99%

Determining Key Spin-Orbitronic Parameters via Propagating Spin Waves

et al. 2020

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We characterize spin wave propagation and its modification by an electrical current in Permalloy(Py)/Pt bilayers with Py thickness between 4 and 20 nm. First, we analyze the frequency non-reciprocity of surface spin waves and extract from it the interfacial Dzyaloshinskii-Moriya interaction constant D s accounting for an additional contribution due to asymmetric surface anisotropies. Second, we measure the spin-wave relaxation rate and deduce from it the Py/Pt spin mixing conductance g ↑↓ ef f . Last, applying a dc electrical current, we extract the spin Hall conductivity σ SH from the change of spin wave relaxation rate due to the spin-Hall spin transfer torque. We obtain a consistent picture of the spin wave propagation data for different film thicknesses using a single set of parameters D s = 0.25 pJ/m, g ↑↓ ef f = 3.2 × 10 19 m −2 and σ SH = 4 × 10 5 S/m. arXiv:1909.04935v1 [cond-mat.mtrl-sci]

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Spin Hall controlled magnonic microwaveguides

Cited by 41 publications

References 29 publications

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

Spin-Wave Amplification and Lasing Driven by Inhomogeneous Spin-Transfer Torques

Determining Key Spin-Orbitronic Parameters via Propagating Spin Waves

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