Abstract
Crystals with broken inversion symmetry can host fundamentally appealing and technologically relevant periodical or localized chiral magnetic textures. The type of the texture as well as its magnetochiral properties are determined by the intrinsic Dzyaloshinskii-Moriya interaction (DMI), which is a material property and can hardly be changed. Here we put forth a method to create new artificial chiral nanoscale objects with tunable magnetochiral properties from standard magnetic materials by using geometrical manipulations. We introduce a mesoscale Dzyaloshinskii-Moriya interaction that combines the intrinsic spin-orbit and extrinsic curvature-driven DMI terms and depends both on the material and geometrical parameters. The vector of the mesoscale DMI determines magnetochiral properties of any curved magnetic system with broken inversion symmetry. The strength and orientation of this vector can be changed by properly choosing the geometry. For a specific example of nanosized magnetic helix, the same material system with different geometrical parameters can acquire one of three zero-temperature magnetic phases, namely, phase with a quasitangential magnetization state, phase with a periodical state and one intermediate phase with a periodical domain wall state. Our approach paves the way towards the realization of a new class of nanoscale spintronic and spinorbitronic devices with the geometrically tunable magnetochirality.
Highlights
A broken chiral symmetry in a magnetic system manifests itself as the appearance of chiral either periodical or localized magnetization structures
The magnetic textures of curvilinear magnets with intrinsic DMI (iDMI) will be necessarily determined by the interplay of two types of chiral interactions which are acting at different lengthscales
In the following we refer to the resulting chiral term of such type as a mesoscale Dzyaloshinskii-Moriya interaction (DMI)
Summary
States in a straight wire with the easy-tangential anisotropy and iDMI. (d) Vectors of the iDMI and eDMI in the σT N=B 0.r5e,f ereTI n=ce2f.r7a,m e=. (e+,f)1)Qsutaatseistainngaenhteilaicl a( l w=ire0w.8i,tσh =th 0e.e5a, s y-TIta=ng0e,n ti=al. In the case of a helical wire, the existence of one peak reveals that the magnetic wire is in the homogeneous quasitangential state and the position of the peak provides access to the geometrical period, λg, of the wire Fig. 3(d2). We propose a method to create new artificial chiral nanostructures with defined properties from standard magnetic materials by using geometrical manipulations[51,55,56,57,58,59,60,61,62], which can be used in the development of the novel spintronics and spin-orbitronics devices In this respect, the great development in nanotechnology, e.g. high-quality thin films growing approach, glancing angular deposition technology[58,62], self-assembling methods and strain engineering techniques[56,57,59], gives promise that these effects can be explored experimentally. The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request
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