6533b861fe1ef96bd12c45a7
RESEARCH PRODUCT
New Boundary-Driven Twist States in Systems with Broken Spatial Inversion Symmetry
Karin Everschor-sitteKjetil M. D. HalsKjetil M. D. Halssubject
PhysicsCondensed Matter - Mesoscale and Nanoscale PhysicsMagnetoresistanceField (physics)Condensed matter physicsAntisymmetric relationFOS: Physical sciencesGeneral Physics and AstronomyBoundary (topology)02 engineering and technologyPhysik (inkl. Astronomie)021001 nanoscience & nanotechnology01 natural sciencesSymmetry (physics)Mesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesTensorBoundary value problemTwist010306 general physics0210 nano-technologydescription
A full description of a magnetic sample includes a correct treatment of the boundary conditions (BCs). This is in particular important in thin film systems, where even bulk properties might be modified by the properties of the boundary of the sample. We study generic ferromagnets with broken spatial inversion symmetry and derive the general micromagnetic BCs of a system with Dzyaloshinskii-Moriya interaction (DMI). We demonstrate that the BCs require the full tensorial structure of the third-rank DMI tensor and not just the antisymmetric part, which is usually taken into account. Specifically, we study systems with $C_{\infty v}$ symmetry and explore the consequences of the DMI. Interestingly, we find that the DMI already in the simplest case of a ferromagnetic thin-film leads to a purely boundary-driven magnetic twist state at the edges of the sample. The twist state represents a new type of DMI-induced spin structure, which is completely independent of the internal DMI field. We estimate the size of the texture-induced magnetoresistance effect being in the range of that of domain walls.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-06-27 | Physical Review Letters |