Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.81: Poster
Freitag, 26. März 2010, 11:00–14:00, Poster B1
Magnetotransmission of surface acoustic waves at the nickel / lithium niobate interface — •C. Heeg1, M. Weiler1, H. Söde1, A. Brandlmaier1, R. Huber2, D. Grundler2, M. S. Brandt3, R. Gross1, and S. T. B. Goennenwein1 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Physik Department, TU München, 85748 Garching, Germany — 3Walter Schottky Institut, TU München, 85748 Garching, Germany
Surface Acoustic Waves (SAWs) have found vast scientific interest in the past decades, mainly due to their application as bandpass filters for e.g. mobile phones. SAWs at ferromagnetic/piezoelectric interfaces can be used to investigate the interaction between mechanical waves and magnetic degrees of freedom.
We generate SAWs at a center frequency of 170 MHz on LiNbO3 substrates by lithographically defining a delay line of two identical, single-finger interdigital transducers spaced approximately 500 µm apart. An approximately 50 nm thick and 100 µm wide nickel Hall bar is then deposited in the SAW propagation path. In these samples we have investigated the correlation between the DC magnetoresistance R(H) in the Hall bar and the high frequency SAW transmission as a function of an applied magnetic field. We find that the SAW damping and velocity S21(H) is dependent on the magnetization in the ferromagnetic thin film as evidenced by coinciding switching fields in S21(H) and R(H).
This work is supported by the DFG via project GO 944/3.