Spin-wave propagation in the presence of interfacial Dzyaloshinskii-Moriya interaction

Moon, Jung Hwan; Seo, Soo Man; Lee, Kyung Jin; Kim, Kyoung-Whan; Ryu, Jisu; Lee, Hyun Woo; McMichael, Robert D.; Stiles, Mark D.

doi:10.1103/physrevb.88.184404

Cited by 311 publications

(233 citation statements)

References 55 publications

(64 reference statements)

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“…(28) [Eq. (29)]. The generated DM fieldlike torque (FLT) ∝ m × y and DM dampinglike torque (DLT) ∝ m × (y × m) are in complete analogy with the Rashba torque [8,9].…”

Section: B Magnetization Deviations Induced By the Spin Wavesmentioning

confidence: 99%

“…Recently, it has been realized that DMI impacts the propagation of spin waves just like spin-orbit coupling affects the electron flow, resulting in topological behaviors such as the magnon Hall effect and edge currents [27]. It was reported that the DMI effect on the spin-wave dispersion is similar to the Rashba spin-orbit coupling effect on electron dispersion [28][29][30]. Therefore, one anticipates that the spin-orbit torque due to electron flow in Rashba spin-orbit coupled systems might have its counterpart due to magnon flow in systems displaying DMI.…”

Section: Introductionmentioning

confidence: 99%

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Magnon-mediated Dzyaloshinskii-Moriya torque in homogeneous ferromagnets

et al. 2014

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In thin magnetic layers with structural inversion asymmetry and spin-orbit coupling, the DzyaloshinskiiMoriya interaction arises at the interface. When a spin-wave current j m flows in a system with a homogeneous magnetization m, this interaction produces an effective fieldlike torque of the form, the latter only in the presence of spin-wave relaxation (z is normal to the interface). These torques mediated by the magnon flow can reorient the time-averaged magnetization direction and display a number of similarities with the torques arising from the electron flow in a magnetic two-dimensional electron gas with Rashba spin-orbit coupling. This magnon-mediated spin-orbit torque can be efficient in the case of magnons driven by a thermal gradient.

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“…(28) [Eq. (29)]. The generated DM fieldlike torque (FLT) ∝ m × y and DM dampinglike torque (DLT) ∝ m × (y × m) are in complete analogy with the Rashba torque [8,9].…”

Section: B Magnetization Deviations Induced By the Spin Wavesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnon-mediated Dzyaloshinskii-Moriya torque in homogeneous ferromagnets

et al. 2014

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“…Considerable thought and effort has been brought to bear on exploiting systems with novel anisotropic spinspin interactions (e.g. Dzyaloshinskii-Moriya interactions) [4][5][6][7][8][9][10] and on engineering new structures (e.g. magnonic crystals) for use in tailoring the propagation characteristics of spin waves [11][12][13][14][15][16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Traveling surface spin-wave resonance spectroscopy using surface acoustic waves

Gowtham

Moriyama

Ralph

et al. 2015

Journal of Applied Physics

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Coherent gigahertz-frequency surface acoustic waves (SAWs) traveling on the surface of a piezoelectric crystal can, via the magnetoelastic interaction, resonantly excite traveling surface spin waves in an adjacent thin-film ferromagnet. These excited surface spin waves, traveling with a definite in-plane wavevector q enforced by the SAW, can be detected by measuring changes in the electro-acoustical transmission of a SAW delay line. Here, we provide a demonstration that such measurements constitute a precise and quantitative technique for spin-wave spectroscopy, providing a means to determine both isotropic and anisotropic contributions to the spin-wave dispersion and damping. We demonstrate the effectiveness of this spectroscopic technique by measuring the spin-wave properties of a Ni thin film for a large range of wave vectors, q = 2.5 10 4 -8 10 4 cm -1 , over which anisotropic dipolar interactions vary from being negligible to quite significant.2

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“…These methods include both determination of the critical ferromagnetic layer thickness at the transition from a Néel to a Bloch wall 14 , and measurements of domain wall motion 19,20,21 . Furthermore, quantitative experimental comparison of the symmetric and anti--symmetric exchange is still outstanding.Recent theory predicts an asymmetric dispersion shift of long--wavelength thermal spin--waves in magnetic thin films due to the DMI 22,23 . Motivated by this theory, we used Brillouin light scattering (BLS) to directly measure the predicted asymmetric dispersion shift, which in turn allowed us to determine the magnitude and direction of the DMI vector in a technological relevant sample system: we used a series of sputtered multilayer stacks consisting of SiN/Ni 80 Fe 20 (t)/Pt(6 nm)/Ta(3 nm)/substrate where t ranged from 1 nm to 13 nm.…”

mentioning

confidence: 99%

“…Recent theory predicts an asymmetric dispersion shift of long--wavelength thermal spin--waves in magnetic thin films due to the DMI 22,23 . Motivated by this theory, we used Brillouin light scattering (BLS) to directly measure the predicted asymmetric dispersion shift, which in turn allowed us to determine the magnitude and direction of the DMI vector in a technological relevant sample system: we used a series of sputtered multilayer stacks consisting of SiN/Ni 80 Fe 20 (t)/Pt(6 nm)/Ta(3 nm)/substrate where t ranged from 1 nm to 13 nm.…”

mentioning

confidence: 99%

Linear relation between Heisenberg exchange and interfacial Dzyaloshinskii–Moriya interaction in metal films

et al. 2015

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Proposals for novel spin--orbitronic logic 1 and memory devices 2 are often predicated on assumptions as to how materials with large spin--orbit coupling interact with ferromagnets when in contact. Such interactions give rise to a host of novel phenomena, such as spin--orbit torques 3,4 , chiral spin--structures 5,6 and chiral spin--torques 7,8 . These chiral properties are related to the anti--symmetric exchange, also referred to as the interfacial Dzyaloshinskii--Moriya interaction (DMI) 9,10 . For numerous phenomena, the relative strengths of the symmetric Heisenberg exchange and the DMI is of great importance. Here, we use optical spin--wave spectroscopy (Brillouin light scattering) to directly determine the DMI vector ! D for a series of Ni 80 Fe 20 /Pt samples, and then compare the nearest--neighbor DMI coupling energy with the independently measured Heisenberg exchange integral. We find that the Ni 80 Fe 20 --thickness--dependencies of both the microscopic symmetric--and antisymmetric--exchange are identical, consistent with the notion that the basic mechanisms of the DMI and Heisenberg exchange essentially share the same underlying physics, as was originally proposed by Moriya 11 . While of significant fundamental importance, this result also leads us to a deeper understanding of DMI and how it could be optimized for spin--orbitronic applications.Recent experimental results have demonstrated how the interplay of symmetric (Heisenberg) exchange and anti--symmetric (DMI) exchange together with anisotropy can give rise to a variety of magnetostatic phenomena, such as magnetic skyrmion lattices 12 , spiral spin structures 13 and chiral domain walls 14 . In bilayer materials with a sufficiently thin, perpendicular magnetized ferromagnet (FM) adjacent to a metal with large spin--orbit coupling in the conduction band, a large DMI favors Néel domain walls with a fixed chirality 15 as opposed to Bloch walls. The combination of a chiral domain wall structure and spin--orbit torque can give rise to fast current induced domain wall motion 3 . The direction and the speed are both dependent on the sign and the strength of the DMI and the spin--orbit torque 8,7 . Moreover, theory for a Rashba model predicts that the interfacial spin--orbit torque is proportional to the ratio of symmetric and anti--symmetric exchange 16 . Thus, direct determination of both the DMI and Heisenberg exchange is crucial for the understanding of the underlying physics in such materials systems and a better understanding of the spin--orbit torques.To date, direct measurements of anti--symmetric exchange are limited to exotic measurement techniques that can only be applied to a few highly specialized sample systems. For example, the DMI constant has been measured via synchrotron--based X--ray scattering interferometry for the weak ferromagnet FeBO 3 17 , by spin--polarized electron energy loss spectroscopy for an atomic bilayer of Fe on W(110) 18 and by spin--polarized scanning tunneling microscopy for atomic monolayer Mn on W(110) 5 .Until...

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Spin-wave propagation in the presence of interfacial Dzyaloshinskii-Moriya interaction

Cited by 311 publications

References 55 publications

Magnon-mediated Dzyaloshinskii-Moriya torque in homogeneous ferromagnets

Magnon-mediated Dzyaloshinskii-Moriya torque in homogeneous ferromagnets

Traveling surface spin-wave resonance spectroscopy using surface acoustic waves

Linear relation between Heisenberg exchange and interfacial Dzyaloshinskii–Moriya interaction in metal films

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