Dzyaloshinsky–Moriya interactions induced by symmetry breaking at a surface

Crépieux, Adeline; Lacroix, C.

doi:10.1016/s0304-8853(97)01044-5

Cited by 311 publications

(271 citation statements)

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“…2e-h shows histograms of the angle a at DW sections with corresponding orientations. Key points for these data demonstrated are as follows: when DW tangential direction is parallel to [1][2][3][4][5][6][7][8][9][10], that is, f ¼ 0°±3°, then the histogram plotted in Fig. 2e shows that the angle a is scattered about a narrow distribution centred near 0°, confirming that these DWs are Néel type with left-handed chirality 17 .…”

Section: Resultsmentioning

confidence: 71%

“…2a, and a typical compound SPLEEM image (see Methods) is shown in Fig. 2b where blue/yellow indicates magnetization components along [1][2][3][4][5][6][7][8][9][10] Fig. 2b, we notice that all DWs are either cyan or red, which means that the in-plane components of all DWs are either parallel or antiparallel to W[001], even though the directions of DWs are oriented along all possible directions within the film plane.…”

Section: Resultsmentioning

confidence: 99%

“…The inversion symmetry can break in the lattice (bulk DMI) or at surfaces and interfaces (interfacial DMI) of magnetic films [6][7][8] . The DMI term between two atomic spin S i and S j on neighbouring atomic sites i and j can be written as E DM ¼ À D ij Á (S i Â S j ), where D ij is the DMI vector.…”

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confidence: 99%

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Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

et al. 2015

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Chiral magnetic domain walls are of great interest because lifting the energetic degeneracy of left-and right-handed spin textures in magnetic domain walls enables fast current-driven domain wall propagation. Although two types of magnetic domain walls are known to exist in magnetic thin films, Bloch-and Néel-walls, up to now the stabilization of homochirality was restricted to Néel-type domain walls. Since the driving mechanism of thin-film magnetic chirality, the interfacial Dzyaloshinskii-Moriya interaction, is thought to vanish in Bloch-type walls, homochiral Bloch walls have remained elusive. Here we use real-space imaging of the spin texture in iron/nickel bilayers on tungsten to show that chiral domain walls of mixed Bloch-type and Néel-type can indeed be stabilized by adding uniaxial strain in the presence of interfacial Dzyaloshinskii-Moriya interaction. Our findings introduce Bloch-type chirality as a new spin texture, which may open up new opportunities to design spin-orbitronics devices.

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Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

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Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

et al. 2015

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“…The DMI in such systems is argued to arise from an RKKY-type interaction that is mediated by the interface atoms of the heavy-metal underlayer through the spin-orbit interaction. [21][22][23][24] Some examples of such material systems include Pt/Co (0.6)/Al 2 O 3 , 25 Pt (2.5)/Co (0.3)/Pt (1.5), 26 Pt (3)/CoFe (0.6)/MgO (1.8) and Ta (5)/CoFe (0.6)/MgO (1.8), 27 Pt (1.5)/Co (0.3)/Ni (0.7)/Co (0.15), 28 , and Pt/[Ni/Co] n and Ir/[Ni/Co] n , 29 where the figures in parentheses represent film thicknesses in nm and are presented here to highlight the importance of the interfacial origin of the effect. At present, the existence of a sizeable DMI has been inferred from experiments involving imaging of static domain wall structures, 29 domain wall nucleation, 30 and from field 26 and current-driven magnetic domain wall dynamics 27,28 in which a clear dependence on the wall chirality has been observed.…”

Section: Introductionmentioning

confidence: 99%

Breathing modes of confined skyrmions in ultrathin magnetic dots

et al. 2014

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The dynamics of individual magnetic skyrmions confined in ultrathin film dots is studied theoretically. The systems considered are transition metal ferromagnets possessing perpendicular magnetic anisotropy and particular attention is given to the dynamic response of the skyrmions to perpendicular driving fields. By using micromagnetics simulations, it is shown that breathing modes can hybridize with geometrically-quantized spin wave eigenmodes of the circular dots considered, leading to distinct features in the power spectrum that differ to the behavior expected for uniformly magnetized systems. The field dependence of the breathing modes offers a direct means of detecting and characterizing such skyrmion states in experiment.

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“…Indeed, it leads to large anisotropy and may even change the magnetic order, see Ref. [33][34][35][36]. In particular, it has been shown that the Dzyaloshinski-Moriya interaction is induced by spin-orbit coupling between two ferromagnetic layers separated by a paramagnetic layer [23].…”

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confidence: 99%

Spin configuration of magnetic multi-layers: effect of exchange, dipolar and Dzyalozhinski–Moriya interactions

Franco¹,

Kachkachi²

2013

J. Phys.: Condens. Matter

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We investigate the effect of coupling (intensity and nature), applied field, and anisotropy on the spin dynamics of a multi-layer system composed of a hard magnetic slab coupled to a soft magnetic slab through a nonmagnetic spacer. The soft slab is modeled as a stack of several atomic layers while the hard layer, of a different material, is either considered as a pinned macroscopic magnetic moment or as an atomic multi-layer system. We compute the magnetization profile and hysteresis loop of the multi-layer system by solving the Landau-Lifshitz equations for the net magnetic moment of each (atomic) layer. We study the competition between the intra-layer anisotropy and exchange interaction, applied magnetic field, and the inter-slab exchange, dipolar or Dzyaloshinski-Moriya interaction. Comparing the effects on the magnetization profile of the three couplings shows that despite the strong effect of the exchange coupling, the dipolar and Dzyaloshinski-Moriya interactions induce a slight (but non negligible) deviation in either the polar or azimuthal direction thus providing more degrees of freedom for adjusting the spin configuration in the multi-layer system.

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Dzyaloshinsky–Moriya interactions induced by symmetry breaking at a surface

Cited by 311 publications

References 0 publications

Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

Breathing modes of confined skyrmions in ultrathin magnetic dots

Spin configuration of magnetic multi-layers: effect of exchange, dipolar and Dzyalozhinski–Moriya interactions

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