Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.2: Poster

Friday, March 18, 2011, 11:00–14:00, P2

Vortex states in magnetic nanodisks in presence of a screw dislocation — •Anna B. Butenko, Ulrich K. Rößler, and Alexei N. Bogdanov — IFW Dresden

Defect structures in magnetic crystalline materials may locally change magnetic properties and can considerably influence the magnetic behavior of magnetic nanostructures. As an example, dislocations in magnets result in additional magnetic anisotropy [1] and break inversion symmetry of crystals which leads to chiral Dzyaloshinskii-Moriya (DM) couplings [2]. It was shown that similar surface-induced DM interactions can strongly affect vortex structures in magnetic nanodisks causing a chirality selection [3]. We present a phenomenological approach for dislocation-induced DM couplings and investigate effects of a screw dislocation at the center of a magnetic nanodisk with a vortex state. By numerical calculations on vortex profiles we analyze equilibrium parameters (the size, shape and stability) of the vortices as functions of applied magnetic field and the material and geometrical parameters.

[1] A.B. Dichenko et al., J. Magn. Magn. Mater. 53 (1985) 71.

[2] A. Arrott, J. Appl. Phys. 34 (1963) 1108; S.V. Maleev, Phys. Uspekhi 45 (2002) 569.

[3] A.B. Butenko et al., Phys. Rev. B 80 (2009) 134410.