Magnetic remanent states in antiferromagnetically coupled multilayers

Details Magnetic remanent states in antiferromagnetically coupled multilayers Magnetic remanent states in antiferromagnetically coupled multilayers

2008-11-14

arxiv.org/abs/0811.2378v1

Journal of Magnetism and Magnetic Materials 322 1340 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Paper submitted by the Joint European Magnetics Symposia 2008, Dublin (4 pages, 3 figures)

Scientific paper

10.1016/j.jmmm.2009.03.031

In antiferromagnetically coupled multilayers with perpendicular anisotropy unusual multidomain textures can be stabilized due to a close competition between long-range demagnetization fields and short-range interlayer exchange coupling. In particular, the formation and evolution of specific topologically stable planar defects within the antiferromagnetic ground state, i.e. wall-like structures with a ferromagnetic configuration extended over a finite width, explain configurational hysteresis phenomena recently observed in [Co/Pt(Pd)]/Ru and [Co/Pt]/NiO multilayers. Within a phenomenological theory, we have analytically derived the equilibrium sizes of these "ferroband" defects as functions of the antiferromagnetic exchange, a bias magnetic field, and geometrical parameters of the multilayers. In the magnetic phase diagram, the existence region of the ferrobands mediates between the regions of patterns with sharp antiferromagnetic domain walls and regular arrays of ferromagnetic stripes. The theoretical results are supported by magnetic force microscopy images of the remanent states observed in [Co/Pt]/Ru.

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