Dresden 2011 – scientific programme

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KR: Fachgruppe Kristallographie

KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)

KR 5.95: Poster

Tuesday, March 15, 2011, 10:45–13:00, P2

Mechanically tunable Spin Wave Resonances in Rolled-Up Permalloy Tubes — •Cornelius Bausch, Felix Balhorn, Simon Jeni, Sebastian Mansfeld, Wolfgang Hansen, Detlef Heitmann, and Stefan Mendach — Institut für Angewandte Physik, Jungiusstr. 11, 20355 Hamburg

The different lattice constants of two epitaxially grown semiconductors cause strain which can be used to fabricate rolled-up mictrotubes [1]. A thin Permalloy layer can be deposited on the strained semiconductor layers before rolling up to obtain a rolled-up Permalloy tube (RUPT)[2]. Spin-wave excitations in these RUPTs have recently been investigated using broadband microwave absorption spectroscopy [2, 3]. Several resonance modes showing different magnetic field dispersions with respect to the magnetic configuration have been observed.

We built a micromechanical squeezer consisting of a small sub-millimeter photo resist block on a polyethylene terephthalate/glass substrate manipulated with a piezo stack. We found that the spin-wave mode spectrum of RUPTs can be modified by mechanically deforming the RUPTs with this squeezer. The modes shift in frequency and eventually disappear. We present possible interpretations for this behavior.

We acknowledge financial support by the SFB668, Grk 1286 and the Cluster of Excellence Nanospintronics.

[1] V. Y. Prinz et al., Physica E 6, 828 (2000); [2] S. Mendach et al., Appl. Phys. Lett. 93, 262501 (2008); [3] Balhorn et al., Phys. Rev. Lett. 204, 037205 (2010)