Spin-wave confinement in rolled-up ferromagnetic tubes

Mendach, Stefan; Podbielski, Jan; Topp, Jesco; Hansen, Wolfgang; Heitmann, Detlef
December 2008
Applied Physics Letters;12/29/2008, Vol. 93 Issue 26, p262501
Academic Journal
We investigate the spin-wave dispersion in rolled-up Permalloy microtubes based on self-rolling strained semiconductor layers. Using microwave absorption spectroscopy we find that these structures exhibit a characteristic spin-wave mode spectrum. The magnetization and spin-wave resonance at zero external magnetic field is determined by curvature induced dynamic demagnetization fields. At high magnetic fields transverse to the tube axis, the three-dimensional shape anisotropy of the tube results in spin-wave confinement in well-defined regions along the tube perimeter.


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