Chiral ferromagnetism beyond Lifshitz invariants

Ado, I. A.; Qaiumzadeh, Alireza; Brataas, Arne; Titov, M.

doi:10.1103/physrevb.101.161403

Cited by 26 publications

(18 citation statements)

References 39 publications

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“…Here, the Levi-Civita symbol, αβγ , is introduced to convert the third-order DMI tensor in Lifshitz invariant presentation [65] to a second-order tensor and V M is the volume of the unit cell of the ferromagnetic film. Eq.…”

Section: Phenomenological Modelingmentioning

confidence: 99%

First Principles Calculation of Dzyaloshinskii-Moriya Interaction: A Green's function Approach

Mahfouzi,

Kioussis

2021

Preprint

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We present a Greens function approach to calculate the Dzyaloshinskii-Moriya interactions (DMI) from first principles electronic structure calculations, that is computationally more efficient and accurate than the most-commonly employed supercell and generalized Bloch-based approaches. The method is applied to the (111) Co/Pt bilayer where the Co-and/or Pt-thickness dependence of the DMI coefficients are calculated. Overall, the calculated DMI are in relatively good agreement with the corresponding values reported experimentally. Furthermore, we investigate the effect of strain in the DMI tensor elements and show that the isotropic Néel DMI can be significantly modulated by the normal strains, xx, yy and is relatively insensitive to the shear strain, xy . Moreover, we show that anisotropic strains, ( xx − yy ) and xy , result in the emergence of anisotropic Néel-and Bloch-type DMIs, respectively.

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Section: Phenomenological Modelingmentioning

confidence: 99%

First Principles Calculation of Dzyaloshinskii-Moriya Interaction: A Green's function Approach

Mahfouzi,

Kioussis

2021

Preprint

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“…Phenomenologically, the free energy density of an inhomogeneous DM interaction can be written as [23,[43][44][45],…”

Section: Dm Interactions In Terms Of Correlation Functionsmentioning

confidence: 99%

“…In another approach, the origin of DM interactions is attributed to a Doppler shift due to an intrinsic spin current induced by SOC [20]. Several different approaches based on the Berry phase formalism and the spin-spin correlation functions have been developed recently to compute the DM interactions of realistic band structures in both FM and AFM systems in equilibrium [21][22][23][24][25]. Equilibrium DM interaction might be enhanced and even induced in magnetic thin films by breaking the inversion symmetry via, e.g., sandwiching a magnetic slab between two different layers, using proximity effects in heavy-metal (HM) and magnetic film heterostructures [26][27][28][29][30], or applying electric gate voltages and lattice strains [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Light-induced Dzyaloshinskii-Moriya interactions in antiferromagnetic metals

Hanslin,

Qaiumzadeh

2020

Preprint

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The Dzyaloshinskii-Moriya (DM) interaction plays an essential role in novel topological spintronics, and the ability to control this chiral interaction is of key importance. Developing a general microscopic framework to compute nonequilibrium DM interactions, we theoretically show that the ac electric field component of a laser pulse induces nonequilibrium static DM interactions in an antiferromagnetic (AFM) system in the presence of relativistic spin-orbit coupling. These nonequilibrium DM interactions might even be anisotropic depending on the direction of magnetic moments and the laser pulse polarization. We further show that intense polarized laser pulses can in principle generate both classes of DM interactions, i.e., bulk-type and interfacial-type, in a magnetic system even though the crystal symmetry prohibits one of them in equilibrium. Our results reveal another aspect of rich behavior of periodically driven spin systems and the far-from-equilibrium magnetic systems.

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“…Some of us also mentioned this in Ref. [28]. Here by n we denote the unit vector of the local magnetization direction.…”

mentioning

confidence: 93%

Quartic asymmetric exchange for monolayer Fe$_3$GeTe$_2$ and other two-dimensional ferromagnets with trigonal prismatic symmetry

Ado¹,

Rakhmanova²,

Zezyulin³

et al. 2021

Preprint

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We suggest a possible origin of noncollinear magnetic textures in ferromagnets (FMs) with the D 3h point group symmetry. Suggested mechanism is different from the Dzyaloshinskii-Moriya interaction (DMI). Considered symmetry class is important because a large fraction of all single-layer intrinsic FMs should belong to it. In particular, so does a monolayer Fe3GeTe2. At the same time, DMI vanishes identically in materials described by this point group, in the continuous limit. We use symmetry analysis to derive all possible contributions to the free energy density that are of the fourth order with respect to the unit vector n of the local magnetization direction and linear with respect to spatial derivatives of n. There are precisely seven such contributions. However, up to boundary terms, only two of them can be considered as independent. Moreover, for a twodimensional system, one of these two necessarily vanishes! We investigate whether the remaining contribution can serve as a source of spin spirals and skyrmions recently observed in Fe3GeTe2. We also address a possible stabilization of bimerons by the same contribution.

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Chiral ferromagnetism beyond Lifshitz invariants

Cited by 26 publications

References 39 publications

First Principles Calculation of Dzyaloshinskii-Moriya Interaction: A Green's function Approach

First Principles Calculation of Dzyaloshinskii-Moriya Interaction: A Green's function Approach

Light-induced Dzyaloshinskii-Moriya interactions in antiferromagnetic metals

Quartic asymmetric exchange for monolayer Fe$_3$GeTe$_2$ and other two-dimensional ferromagnets with trigonal prismatic symmetry

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