Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 112: Electronic structure: Surface magnetism and spin phenomena II
O 112.7: Talk
Friday, March 16, 2018, 12:00–12:15, MA 042
Interaction between spin waves and domain walls in ferromagnetic nanostripes — •Nerea Ontoso1,2, Luis Lopez-Diaz1, Luis Torres1, and Rocio Yanes1 — 1University of Salamanca, Salamanca, Spain — 2CIC nanoGUNE, San Sebastian, Spain
Spin waves are linear low-energy excitations that propagate in ferromagnetic materials. Domain walls, on the other hand, are very stable localized structures that separate regions with uniform magnetization. Both of them are key elements of various spintronic devices, such as racetrack memories or magnon transistors.
By using micromagnetic simulations, we study the interaction between domain walls and spin waves. We analyze two different cases: (i) a head-to-head domain wall in an in-plane magnetized soft ferromagnetic stripe and (ii) a Bloch wall in a nanostripe with high perpendicular anisotropy. We perform a systematic study as a function of the frequency, spin wave amplitude and distance between the spin wave source and the domain wall. We obtain a rather complicated frequency dependence that we try to interpret in terms of spin wave reflection/transmission at the domain wall. However, a general description of this process is complex and requires taking into account dipolar fields, excitation of internal domain wall modes and high order spin wave modes due to the finite stripe width.