Magnetic interfaces as sources of coherent spin waves

Poimanov, V. D.; Kuchko, A. N.; Kruglyak, V. V.

doi:10.1103/physrevb.98.104418

Cited by 22 publications

(31 citation statements)

References 40 publications

(77 reference statements)

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“…We note that at μ 0 H = 0.002 T, the evaluated wavevector is still larger than expected from a nonmagnetic CPW. We attribute this observation to either the hysteresis of the Fe stripe (i.e., a finite remanent magnetization component of Fe along θ = 90°) or the differences in magnetic susceptibilities of Fe and YIG 24 . The observation of a significant wavelength-conversion process in very small applied field is promising in view of low-power consuming and compact magnonic applications, where an additional biasing magnetic field is avoided and instead electric fields control the magnonic functionality 42,43 .…”

Section: Discussionmentioning

confidence: 99%

“…1b, a formalism needs to be developed, which, in the spin-precessional equation of motion, considers both the inhomogeneous effective field B eff (y) and noncollinear spin structures (Fig. 3a) as well as local differences in magnetic susceptibilities 24 .…”

Section: Discussionmentioning

confidence: 99%

“…Instead parametric pumping in the nonlinear regime has been utilized to obtain exchange magnons with k > 20 rad μm −116-18 . Concerning emission of such magnons in the linear regime, nonuniform spin textures [19][20][21][22] , magnetic interfaces 23,24 , and the magnonic grating coupler effect [25][26][27] have been explored. Magnons with λ ≈ 50 nm (k ≈ 120 rad μm −1 ) were induced in thin yttrium iron garnet (YIG) by means of a grating coupler consisting of a periodic lattice of parallel nanostripes 28 .…”

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confidence: 99%

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Efficient wavelength conversion of exchange magnons below 100 nm by magnetic coplanar waveguides

et al. 2020

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Exchange magnons are essential for unprecedented miniaturization of GHz electronics and magnon-based logic. However, their efficient excitation via microwave fields is still a challenge. Current methods including nanocontacts and grating couplers require advanced nanofabrication tools which limit the broad usage. Here, we report efficient emission and detection of exchange magnons using micron-sized coplanar waveguides (CPWs) into which we integrated ferromagnetic (m) layers. We excited magnons in a broad frequency band with wavelengths λ down to 100 nm propagating over macroscopic distances in thin yttrium iron garnet. Applying time-and spatially resolved Brillouin light scattering as well as micromagnetic simulations we evidence a significant wavelength conversion process near mCPWs via tunable inhomogeneous fields. We show how optimized mCPWs can form microwave-tomagnon transducers providing phase-coherent exchange magnons with λ of 37 nm. Without any nanofabrication they allow one to harvest the advantages of nanomagnonics by antenna designs exploited in conventional microwave circuits.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Efficient wavelength conversion of exchange magnons below 100 nm by magnetic coplanar waveguides

et al. 2020

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“…Of course this limitation of linear excitation may be overcome by the methods mentioned in ref. 71 . Interestingly, parametric SWs with relatively large amplitude and much narrower linewidth can be excited by VCMA 69 , as compared with Oersted field.…”

Section: Vcma-induced Ferromagnetic Resonance (Vcma-fmr)mentioning

confidence: 99%

“…Au et al have shown that localized dynamic dipolar field created by the FMR of a rod-like magnetic nanostructure on top of a SWWG can excite shorter wavelength SWs 76 . Even smooth interface between two magnetic films can also excite shortwavelength coherent SWs very efficiently 71 . All these abovementioned methods either need to create nonuniformities in magnetic film or need two magnetic layers, which may increase the complexity of device fabrication.…”

Section: Excitation Of Coherent Propagating Swsmentioning

confidence: 99%

Towards magnonic devices based on voltage-controlled magnetic anisotropy

2019

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Despite significant technological advances in miniaturization and operational speed, modern electronic devices suffer from unescapably increasing rates of Joule heating and power consumption. Avoiding these limitations sparked the quest to identify alternative, chargeneutral information carriers. Thus, spin waves, the collective precessional motion of spins in permanent magnets, were proposed as a promising alternative system for encoding information. In order to surpass the speed, efficiency, functionality and integration density of current electronic devices, magnonic devices should be driven by electric-field induced methods. This review highlights recent progress in the development of electric-fieldcontrolled magnonic devices, including present challenges, future perspectives and the scope for further improvement. S pin waves (SWs) are the dynamic eigen modes of magnetically ordered systems, such as ferromagnetic (FM) metals 1,2 , ferrimagnetic insulators 3,4 and antiferromagnets 5. In other words, SWs are phase coherent collective precessional motion of ordered magnetic spins 6 (Fig. 1a). These SWs may serve as a potential information carrier in future microwave signalprocessing devices, by using its amplitude, phase, and polarization, at significantly lower power consumption as SWs are not associated with translational motion of electronic charges 4,7. Therefore, SWs can be used as an alternative to modern charge current-based complementary metal-oxide-semiconductor (CMOS) technology, which is now suffering from increased rate of power consumption due to Joule heating. The quanta of SWs are called "magnon". Following this name, a new research field, known as "magnonics" 6,8 , is rapidly developing. When magnonics meets spintronics, the field is known as magnon spintronics 9. The aim of magnonics is to control and manipulate SW properties so that they can be utilized in future spintronics technology 8,9. Apart from lower energy consumption, another advantage of SWs is that they can have wide variety of wavelengths ranging from few tens of micrometer down to few tens of nanometer with the corresponding frequency ranging from few Gigahertz to few Terahertz, which can be even controlled by tuning various internal and external parameters, such as saturation magnetization, various magnetic anisotropies, magnetostatic interactions, exchange interaction, magnetic field, and electric field 8,10,11. Although, SWs have much smaller group

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