Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

Magnetic vortices are of great interest for storage media since quite some time. Different control methods are used to manipulate them [1]. We now use scanning transmission X-ray microscopy (STXM) to image the magnetic configurations within the different layers of a trilayer system of a Co/Cu/FeNi disc. Inside the hard and soft magnetic layers with a thickness of 25 nm vortices are formed. They couple depending on the interlayer. The dominant coupling mechanisms here are the magneto-dipolar interaction and interlayer exchange coupling [2]. The setup allows to drive a current perpendicularly through the disc. The corresponding behaviors of the magnetization configurations with a DC-current, in a static magnetic field, as well as in an oscillating magnetic field, are investigated. The emerging movement of the core can be tuned with the amplitude and frequency of the field. The interactions of the two cores and their individually movements are studied. This implies the corresponding resistance changes within different configurations at different magnetic fields and currents as well as the shifting of the core.
[1] N. Locatelli et al., Appl. Phys. Lett. 98, 062501 (2011)
[2] S. Wintz et al., Appl. Phys. Lett. 98, 232511 (2011)