Interfacial Dzyaloshinskii-Moriya Interaction in 
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 Films: Effect of the Heavy-Metal Thickness

Tacchi, S.; Troncoso, Roberto E.; Ahlberg, Martina; Gubbiotti, G.; Madami, M.; Åkerman, Johan; Landeros, P.

doi:10.1103/physrevlett.118.147201

Cited by 204 publications

(147 citation statements)

References 73 publications

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“…On the other hand, the coefficient continuously increases in magnitude by a factor of 7 when the IrMn layer thickness increases from 1 to 7.5 nm. There are important differences as well as similarities between the DMI in the AFM/FM system reported here and that in heavy metal (HM)/FM bilayers investigated extensively in recent years [29][30][31][32][33][34][35][36][37][38][39][40] . Our discovery is in synergy with many on-going activities exploring analogous phenomena between HM/FM and AFM/FM bilayers 1, 2, 14-16 .…”

mentioning

confidence: 61%

“…Empirically, the DMI increases with larger HM but quickly saturates when HM approaches the spin diffusion length in the HM (e.g. ~2 nm for Pt) 29 . The situation in an AFM/FM heterostructure, however, is more complicated.…”

Section: (B) (A)mentioning

confidence: 99%

“…In the HM/FM systems, theoretical and experimental studies on HM thickness dependence suggest that the contribution to DMI is dominated by the spin-orbit coupling of the first atomic layer of HM at HM/FM interface and extends weakly away from the interface 29,36,47 . Empirically, the DMI increases with larger HM but quickly saturates when HM approaches the spin diffusion length in the HM (e.g.…”

Section: (B) (A)mentioning

confidence: 99%

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Dzyaloshinskii-Moriya Interaction across an Antiferromagnet-Ferromagnet Interface

Sasaki

et al. 2017

Phys. Rev. Lett.

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The antiferromagnet (AFM) / ferromagnet (FM) interfaces are of central importance in recently developed pure electric or ultrafast control of FM spins, where the underlying mechanisms remain unresolved. Here we report the direct observation of Dzyaloshinskii-Moriya interaction (DMI) across the AFM/FM interface of IrMn/CoFeB thin films. The interfacial DMI is quantitatively measured from the asymmetric spin-wave dispersion in the FM layer using Brillouin light scattering. The DMI strength is enhanced by a factor of 7 with increasing IrMn layer thickness in the range of 1-7.5 nm. Our findings provide deeper insight into the coupling at AFM/FM interface and may stimulate new device concepts utilizing chiral spin textures such as magnetic skyrmions in AFM/FM heterostructures.Control of spins in ferromagnets (FMs) utilizing antiferromagnets (AFMs) is an emerging branch of spintronics [1][2][3][4][5] . By placing an AFM layer adjacent to the FM layer, the unique electric, magnetic and transport properties of the AFM may be used to control the FM layer via interfacial coupling. Conventionally, the AFM layer has mostly played a passive role in device operations by either improving the hardness of FM via exchange bias [6][7][8] or increasing the magnetic damping of FM through spin pumping [9][10][11][12][13] . More recently, the AFMs have been used as active control elements, leading to promising breakthroughs in the electric and ultrafast control of FM spins. For instance, electric current-induced magnetization switching of FM without an external magnetic field has been realized in the AFM/FM systems [1][2][3][4] . These pioneering experiments have been shown to generate the pure spin current in the AFM or at the AFM/FM interface 1,2,[14][15][16] and to utilize the exchange bias to break the switching symmetry [1][2][3][4] . Moreover, coherent spin precession in the FM layer can be effectively excited by an ultrafast spin-exchange-coupling torque across the AFM/FM interface 5 . The laser pulse perturbs the AFM spin arrangement, which in turn generates an intense and non-thermal transient torque acting on the FM spins. Despite these promising achievements, certain limitations such as the incomplete magnetization switching by current remain in the AFM/FM system. Thus, elucidating interaction mechanisms across the AFM/FM interface is not only important from a scientific point of view, but also of great technologic relevance.In heterostructures with broken spatial inversion symmetry, the interfacial Dzyaloshinskii-Moriya interaction (DMI) has been identified as an important mechanism leading to a host of interesting phenomena. DMI promotes non-collinear spin alignments and determines the chirality and dynamics of chiral spin textures [17][18][19] . For instance, DMI stabilizes the magnetic skrymions and domain walls in the Né el configuration with certain chirality and lends a mechanism for driving skrymion and domain wall motion via spin torques [20][21][22][23][24][25] . Similarly, DMI likely contributes to the current-in...

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mentioning

confidence: 61%

Section: (B) (A)mentioning

confidence: 99%

Section: (B) (A)mentioning

confidence: 99%

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Dzyaloshinskii-Moriya Interaction across an Antiferromagnet-Ferromagnet Interface

Sasaki

et al. 2017

Phys. Rev. Lett.

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“…In such thin film structures, a spatial modulation of interfacial DMI can be realized by a local gating [56], a local modulation of the interface between ferromagnetic layer and heavy metal layer [57][58][59], or a local variation of the heavy metal thickness [60]. For a magnonic crystal with spatially modulated DMI, we establish an effective Schrödinger equation for spin waves and derive spin-wave boundary conditions at the boundary between two regions having different DMI values.…”

Section: Introductionmentioning

confidence: 99%

Spin-wave propagation in the presence of inhomogeneous Dzyaloshinskii-Moriya interactions

et al. 2017

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We theoretically investigate spin-wave propagation through a magnetic metamaterial with spatially modulated Dzyaloshinskii-Moriya interaction. We establish an effective Schrödinger equation for spin waves and derive boundary conditions for spin waves passing through the boundary between two regions having different Dzyaloshinskii-Moriya interactions. Based on these boundary conditions, we find that the spin wave can be amplified at the boundary and the spin-wave band gap is tunable either by an external magnetic field or the strength of Dzyaloshinskii-Moriya interaction, which offers a spin-wave analog of the field-effect transistor in traditional electronics.

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“…(16)]. Assuming the magnitude of the DM interaction [127][128][129]132,133 Γ DM , the Landau energy level spacing is given by 48 (4JS/ √ 3π)(Γ DM /J) 2 ; see Refs. [46,48] for details.…”

Section: Appendix A: Magnons In Afsmentioning

confidence: 99%

Magnonic topological insulators in antiferromagnets

et al. 2017

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Extending the notion of symmetry protected topological phases to insulating antiferromagnets (AFs) described in terms of opposite magnetic dipole moments associated with the magnetic Néel order, we establish a bosonic counterpart of topological insulators in semiconductors. Making use of the Aharonov-Casher effect, induced by electric field gradients, we propose a magnonic analog of the quantum spin Hall effect (magnonic QSHE) for edge states that carry helical magnons. We show that such up and down magnons form the same Landau levels and perform cyclotron motion with the same frequency but propagate in opposite direction. The insulating AF becomes characterized by a topological Z2 number consisting of the Chern integer associated with each helical magnon edge state. Focusing on the topological Hall phase for magnons, we study bulk magnon effects such as magnonic spin, thermal, Nernst, and Ettinghausen effects, as well as the thermomagnetic properties of helical magnon transport both in topologically trivial and nontrivial bulk AFs and establish the magnonic Wiedemann-Franz law. We show that our predictions are within experimental reach with current device and measurement techniques.

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Interfacial Dzyaloshinskii-Moriya Interaction in Pt/CoFeB Films: Effect of the Heavy-Metal Thickness

Cited by 204 publications

References 73 publications

Dzyaloshinskii-Moriya Interaction across an Antiferromagnet-Ferromagnet Interface

Dzyaloshinskii-Moriya Interaction across an Antiferromagnet-Ferromagnet Interface

Spin-wave propagation in the presence of inhomogeneous Dzyaloshinskii-Moriya interactions

Magnonic topological insulators in antiferromagnets

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