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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.138: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Spin-structure investigations by electron holography — •D. Backes^1,2, L.J. Heyderman¹, C. David¹, F. Nolting³, M. Kläui², M. Laufenberg², H. Ehrke^2,4, D. Bedau², U. Rüdiger², C.A.F. Vaz⁵, J.A.C. Bland⁵, T. Kasama⁴, R.E. Dunin-Borkowski⁴, S. Cherifi⁶, A. Locatelli⁶, and S. Heun⁶ — ¹Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, Switzerland — ²FB Physik, Universität Konstanz — ³Swiss Light Source, Paul Scherrer Institut, Switzerland — ⁴Department of Materials Science and Metallurgy, University of Cambridge, UK — ⁵Cavendish Laboratory, University of Cambridge, UK — ⁶Sincrotrone Trieste, Basovizza, Italy

Domain walls of ferromagnetic curved-line elements exhibit two spin-configurations - the vortex and the transverse wall type. Systematical experimental studies have shown that the type depends on the geometry. We report on the fabrication of these curved-line elements on membranes which are essential to investigate them with electron holography. This measurement technique is able to visualize the magnetic induction in the elements and the magnetic stray fields outside of the elements. This allows us to study the interaction between domain walls which leads to interaction-induced transitions between the domain wall types. Small geometrical constrictions down to 30 nm have a large influence on the spin-structure of the domain walls [1]. With a resolution below 5 nm the spin-structure near and in the constrictions can be observed. Correlating this with magnetoresistance measurements reveals information about the interaction of spin-polarized charge carriers and domain walls.

[1] M. Kläui et al., Phys. Rev. Lett. 90, 97202 (2003)