Direct Observation of the Dzyaloshinskii-Moriya Interaction in a Pt/Co/Ni Film

Di, Kai; Zhang, Vanessa Li; Lim, H. S.; Ng, S. C.; Kuok, M. H.; Yu, Jiawei; Yoon, Jung Won; Qiu, Xuepeng; Yang, Hyunsoo

doi:10.1103/physrevlett.114.047201

Cited by 324 publications

(285 citation statements)

References 44 publications

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“…Similar relativistic band-modification is also emergent for spin wave (magnon) in magnetic materials. The asymmetric magnon band dispersion induced by the Dzyaloshinskii-Moriya interaction 6,7 , which is antisymmetric exchange interaction originating from the spinorbit interaction, is theoretically expected 8,9 , and experimentally observed recently in noncentrosymmetric ferromagnets 10,11 . Here, we demonstrate that the nonreciprocal microwave response can be induced by the asymmetric magnon band in a noncentrosymmetric ferrimagnet LiFe 5 O 8 .…”

Section: Introductionmentioning

confidence: 82%

Nonreciprocal magnon propagation in a noncentrosymmetric ferromagnetLiFe5O8

Iguchi¹,

Uemura²,

Ueno³

et al. 2015

Phys. Rev. B

100

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Relativistic spin-orbit interaction drastically modifies electronic band and endows emergent functionalities. One of the example is the Rashba effect 1,2 . In noncentrosymmetric systems such as interface 3 and polar materials 4,5 , the electronic band is spin-splitted depending on the momentum direction owing to the spin-orbit interaction, which is useful for the electric manipulation of spin current. Similar relativistic band-modification is also emergent for spin wave (magnon) in magnetic materials. The asymmetric magnon band dispersion induced by the Dzyaloshinskii-Moriya interaction 6,7 , which is antisymmetric exchange interaction originating from the spinorbit interaction, is theoretically expected 8,9 , and experimentally observed recently in noncentrosymmetric ferromagnets 10,11 . Here, we demonstrate that the nonreciprocal microwave response can be induced by the asymmetric magnon band in a noncentrosymmetric ferrimagnet LiFe 5 O 8 . This result may pave a new path to designing magnonic device based on the relativistic band engineering.

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Section: Introductionmentioning

confidence: 82%

Nonreciprocal magnon propagation in a noncentrosymmetric ferromagnetLiFe5O8

Iguchi¹,

Uemura²,

Ueno³

et al. 2015

Phys. Rev. B

100

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“…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%

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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“…Although theoretically well understood, experimental confirmation of the magnon dispersion shift has been largely limited to ferromagnetic thin films [11][12][13][14] , where the inversion symmetry is trivially lost. For magnons in bulk noncentrosymmetric ferromagnets, very recently, the nonreciprocal propagation of the magnons was detected in the two compounds LiFe 5 O 8 15 and Cu 2 OSeO 3 16 in a GHz (or µeV) range using a modern microwave resonance technique.…”

Section: Introductionmentioning

confidence: 99%

Magnon dispersion shift in the induced ferromagnetic phase of noncentrosymmetric MnSi

et al. 2016

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Small angle neutron inelastic scattering measurement has been performed to study the magnon dispersion relation in the field-induced-ferromagnetic phase of the noncentrosymmetric binary compound MnSi. For the magnons propagating parallel or anti-parallel to the external magnetic field, we experimentally confirmed that the dispersion relation is asymmetrically shifted along the magnetic field direction. This magnon dispersion shift is attributed to the relativistic Dzyaloshinskii-Moriya interaction, which is finite in noncentrosymmetric magnets, such as MnSi. The shift direction is found to be switchable by reversing the external magnetic field direction.

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Direct Observation of the Dzyaloshinskii-Moriya Interaction in a Pt/Co/Ni Film

Cited by 324 publications

References 44 publications

Nonreciprocal magnon propagation in a noncentrosymmetric ferromagnetLiFe5O8

Nonreciprocal magnon propagation in a noncentrosymmetric ferromagnetLiFe5O8

Dzyaloshinskii-Moriya Interaction across an Antiferromagnet-Ferromagnet Interface

Magnon dispersion shift in the induced ferromagnetic phase of noncentrosymmetric MnSi

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