Topological protection of magnetic domain walls, Dr. Ales Hrabec (Univ. of Leeds)

21.04.2015 von 17:00 bis 18:00

Einladender: Prof. Heinze

The broken inversion symmetry at ferromagnetic interfaces offers new ways to manipulate the magnetic state. The combination of a heavy metal and a thin ferromagnetic film gives rise to new phenomena which normally vanish in bulk, but play an important role as soon as the thickness of the ferromagnet is reduced to an atomic size. The presence of a Rashba electric field and Dzyaloshinskii-Moryia interaction (DMI) has been recently demonstrated in ferromagnet/heavy metal systems. In this seminar I will talk about the ways to measure the DMI in thin magnetic films macroscopically. Magnetic domain walls are ideal objects for this since they are the first precursors indicating the presence of the DMI. We use magnetic field induced domain wall displacement measurements employing the Kerr microscopy. I will also show that the Néel texture of the magnetic domain walls, which is a consequence of a week DMI, can be revealed by the high resolution Lorentz transmission electron microscopy.

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