Interfacial control of Dzyaloshinskii-Moriya interaction in heavy metal/ferromagnetic metal thin film heterostructures

Ma, Xin; Yu, Guoqiang; Li, Xiang; Wang, Tao; Wu, Di; Olsson, Kevin; Chu, Zhaodong; An, Kay Hyeok; Xiao, John Q.; Wang, Kang L.; Li, Xiaoqin

doi:10.1103/physrevb.94.180408

Cited by 79 publications

(51 citation statements)

References 36 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: 62%

“…BLS measurements were performed by varying the light incident angle [30][31][32][33][34][35][36][37]43 . Figure 2a shows the asymmetric spin wave dispersion at the IrMn(5)/CoFeB film under opposite , which can be well fitted with Eq.1.…”

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%

“…2. The negative slope indicates that < 0 and the left-handed magnetic chirality is preferred in the IrMn(5)/CoFeB(2) film 36 .…”

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: 62%

Section: (B) (A)mentioning

confidence: 99%

Section: (B) (A)mentioning

confidence: 99%

“…2. The negative slope indicates that < 0 and the left-handed magnetic chirality is preferred in the IrMn(5)/CoFeB(2) film 36 .…”

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 our opinion, the former can be factorized into two-meson distribution amplitudes while the latter is ignored in the quasitwo-body approximation. Over past few years, the braching ratios and direct C P asymmetries of the three-body decays such as [55] have been studied systematically in the PQCD approach. In a recent work, the P-wave resonance contributions have been calculated in the B → K ππ decays [56].…”

Section: Introductionmentioning

confidence: 99%

The S-wave resonance contributions in the $$B^{0}_{s}$$ B s 0 decays into $$\psi (2S,3S)$$

Rui

Wang

2017

Eur. Phys. J. C

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The three-body decays B 0 s → ψ(2S, 3S)π + π − are studied based on the perturbative QCD approach. With the help of the nonperturbative two-pion distribution amplitudes, the analysis is simplified into the quasi-two-body processes. Besides the traditional factorizable and nonfactorizable diagrams at the leading order, the next-to-leading order vertex corrections are also included to cancel the scale dependence. The f 0 (980), f 0 (1500) resonance contributions as well as the nonresonant contributions are taken into account using the presently known ππ time-like scalar form factor for the ss component. It is found that the predicted B 0 s → ψ(2S)π + π − decay spectra in the pion pair invariant mass shows a similar behavior as the experiment. The calculated S-wave contributions to the branching ratio of B 0 s → ψ(2S)π + π − is 6.0 × 10 −5 , which is in agreement with the LHCb data B(B 0 s → ψ(2S)π + π − ) = (7.2 ± 1.2) × 10 −5 within errors. The estimate of B(B 0 s → ψ(3S)π + π − ) can reach the order of 10 −5 , pending the corresponding measurements.

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Discovery of strong bulk Dzyaloshinskii-Moriya interaction in composition-uniform centrosymmetric magnetic single layers

Zhu,

Lujan,

2024

Sci. China Phys. Mech. Astron.

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Interfacial control of Dzyaloshinskii-Moriya interaction in heavy metal/ferromagnetic metal thin film heterostructures

Cited by 79 publications

References 36 publications

Dzyaloshinskii-Moriya Interaction across an Antiferromagnet-Ferromagnet Interface

Dzyaloshinskii-Moriya Interaction across an Antiferromagnet-Ferromagnet Interface

The S-wave resonance contributions in the $$B^{0}_{s}$$ B s 0 decays into $$\psi (2S,3S)$$

Discovery of strong bulk Dzyaloshinskii-Moriya interaction in composition-uniform centrosymmetric magnetic single layers

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