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

Krivoruchko, V. N.; Savchenko, A. S.; Kruglyak, V. V.

doi:10.1103/physrevb.98.024427

Cited by 28 publications

(18 citation statements)

References 32 publications

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“…(ii) The spin-wave wavelength conversion (albeit probably not the Möbius mode formation) should occur in magnonic systems featuring a single valley at a finite wave number, with the shift induced, e.g., by the Dzyaloshinskii-Moriya interaction (DMI) interaction [55] or electric field [56].…”

Section: Discussionmentioning

confidence: 99%

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Fripp

Kruglyak

2021

Phys. Rev. B

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We have used micromagnetic simulations to model backward-volume dipole-exchange spin waves in graded profiles of the bias magnetic field. We demonstrate spin-wave wavelength conversion upon the wave's reflection from turning points due to the two characteristic minima ("U points") occurring in their dispersion at finite (nonzero) wave vectors. As a result, backward-volume dipole-exchange spin waves confined in "spin-wave wells" either form Möbius modes, making multiple real-space turns for each reciprocal-space round trip, or split into pairs of degenerate modes in the valleys near the two U points. The latter modes may therefore be assigned a pseudospin. We show that the pseudospin can be switched by scattering the spin wave from decreases of the bias magnetic field, while it is immune to scattering from field increases. Pseudospin creation and read-out can be accomplished using chiral spin-wave transducers, as described in Au et al. [Appl. Phys. Lett. 100, 182404 (2012)] and Au et al. [Appl. Phys. Lett. 100, 172408 (2012)], respectively. Taken together, the possibility of pseudospin creation, manipulation, and read-out suggests a path to development of a spin-wave version of valleytronics ("magnon valleytronics"), in which the pseudospin (rather than amplitude or phase) of spin waves would be used to encode data. Our results are not limited to graded bias magnetic field but can be generalized to other magnonic media with spatially varying characteristics, produced using the toolbox of graded index magnonics.

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Section: Discussionmentioning

confidence: 99%

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Fripp

Kruglyak

2021

Phys. Rev. B

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“…However, the desired nonuniformity in magnetization can be created through proper design of sample structure by using single or multiple magnetic materials, and can be controlled through dynamic demagnetizing field with the help of an external magnetic field 81 . Very recently, the theoretical work by Krivoruchko et al have shown that an external electric field, applied along a direction perpendicular to SW wavevector and magnetization, can induce Dzyaloshinskii-Moriya-like (DM-like) interaction 82 , known as Aharanov-Casher effect. This electric field-induced DM-like interaction makes SWdispersion anisotropic and nonreciprocal, which also promises to be a potential method to create caustic-like SW beam excited from a point source in a FM thin film.…”

Section: Formation Of Reconfigurable Sw Nanochannelsmentioning

confidence: 99%

“…Although there are some reports about the electric-field modulation of SWs in multiferroic materials 27,28 and ferrimagnetic insulators (e.g. YIG) 82,86 , the VCMA modulation of SWs in metallic FMs has several advantages over them as already discussed.…”

Section: Reconfigurable Magnonic Crystalsmentioning

confidence: 99%

“…Experimental report shows that a direct electric field coupling to propagating SWs is possible even in a centrosymmetric ferrimagnetic insulators, like YIG, via Aharanov-Casher effect. This provides an efficient way to modulate SW frequency, phase 86 , and propagation direction 82 . Although, Heusler alloys, like Co 2 FeAl, show iPMA 101 and high TMR 102 , demonstration of electric-field control of iPMA is still lacking.…”

Section: Future Perspectivesmentioning

confidence: 99%

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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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“…A plethora of theoretical and experimental investigations have demonstrated the electric field–induced control of magnetization in magnetic heterostructures including multiferroic materials ( 19 ), FM semiconductors ( 20 ), piezoelectric materials ( 21 ), or metallic FM/insulator (oxide) interfaces ( 22 ). Furthermore, parametric pumping of SWs by means of VCMA ( 23 ) and electric field control of SW power flow and caustics in thin magnetic films have also been demonstrated theoretically ( 24 ). FM/oxide interfaces have gained a substantial attention due to their superior control over magnetic parameters (e.g., anisotropy) at ambient condition as compared to other systems.…”

Section: Introductionmentioning

confidence: 99%

Voltage controlled on-demand magnonic nanochannels

et al. 2020

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Development of energy-efficient on-demand magnonic nanochannels (MNCs) can revolutionize on-chip data communication and processing. We have developed a dynamic MNC array by periodically tailoring perpendicular magnetic anisotropy using the electric field. Brillouin light scattering spectroscopy is used to probe the spin wave (SW) dispersion of MNCs formed by applying a static electric field at the CoFeB/MgO interface through the one-dimensional stripe-like array of indium tin oxide electrodes placed on top of Ta/CoFeB/MgO/Al2O3 heterostructures. Magnonic bands, consisting of two SW frequency modes, appear with a bandgap under the application of moderate gate voltage, which can be switched off by withdrawing the voltage. The experimental results are reproduced by plane wave method–based numerical calculations, and simulated SW mode profiles show propagating SWs through nanochannels with different magnetic properties. The anticrossing between these two modes gives rise to the observed magnonic bandgap.

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

Cited by 28 publications

References 32 publications

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Towards magnonic devices based on voltage-controlled magnetic anisotropy

Voltage controlled on-demand magnonic nanochannels

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