SEMINARIUM

Zakładów Naukowych ZN 2, ZN 3, ZN 5

Dnia: 13.12.2024 roku (piątek)
o godzinie 10:00 w auli Instytutu

referat pt.:

Spin wave dynamics in thin films with perpendicular anisotropy

wygłosi

dr hab. Paweł Gruszecki

Uniwersytet im. Adama Mickiewicza w Poznaniu

Perpendicular Magnetic Anisotropy (PMA) in thin ferromagnetic films at low magnetic fields may allow the formation of magnetic domain patterns with magnetization directed perpendicular to the surface. Examples of such domain structures are aligned stripe domain patterns with well-defined periodicity in the range of 100 nm. The presence of PMA not only modifies the magnetic configuration of the system, but also significantly affects the dynamics of the spin waves, i.e. the propagating collective precessional disturbances of the magnetization. This effect on the spin waves is not only due to the PMA-induced inhomogeneity of the magnetitic texture, but also to the effect of PMA itself on the precession of the magnetic moments, which leads to surprising consequences. In this talk the effect of PMA on the spin wave dynamics will be discussed both in aligned stripe domain patterns (which act as magnonic crystals) and in uniformly magnetized systems, in particular at low magnetic fields close to the critical field at which the phase transition to the stripe domain pattern occurs.