Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 101: Transport - Poster Session
TT 101.23: Poster
Thursday, April 3, 2014, 15:00–19:00, P2
Magnetostriction in Nanomechanical Beams — •Rasmus Hollaender1, M. Pernpeintner1, M. J. Seitner2, 3, J. P. Kotthaus2, E. M. Weig2,3, S. T. B. Goennenwein1, R. Gross1, and H. Huebl1 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Center for NanoScience (CeNS) and Fakultät für Physik, LMU, München, Germany — 3Fachbereich Physik, Universität Konstanz, Germany
Nanomechanical sensors have demonstrated excellent force sensitivity [1], allowing for the detection of individual spins on surfaces [2]. Here, we apply this sensor concept to the detection of magnetostriction in nanometer thick ferromagnetic cobalt films.
To this end we experimentally investigate the eigenfrequency of a 25 µ m long and 300 nm wide highly stressed silicon nitride beam covered by a 10 nm thin film of cobalt at room temperature as function of the direction and magnitude of the applied magnetic field in the plane of the film using optical interferometry. For magnetic fields applied in the direction perpendicular to the beam, we find a decrease in the resonance frequency by 7.6 kHz compared to fields applied along the beam direction.
We explain this 10−4 change in the resonance frequency quantitatively by modeling the impact of the magnetization orientation dependent magnetostriction.
This opens the path for further magneto-mechanical experiments in nanostructures. Financial support via the Nanosystems Initiative Munich is gratefully acknowledged.
J. Moser et al., Nature Nanotechnology 8, 493 (2013)
D. Rugar et al., Nature 430, 329 (2004)