Journal
APPLIED PHYSICS LETTERS
Volume 99, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3662931
Keywords
ferrimagnetic materials; paramagnetic materials; piezoelectric transducers; platinum; spin Hall effect; surface acoustic waves; yttrium compounds
Categories
Funding
- Australian DPMC
- ARC [DP0773221]
- NHMRC [546238]
- Grants-in-Aid for Scientific Research [21244058] Funding Source: KAKEN
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A surface acoustic wave (SAW) actuated rotary motor is reported here, consisting of a millimeter-sized spherical metal rotor placed on the surface of a lead zirconate titanate piezoelectric substrate upon which the SAW is made to propagate. At the design frequency of 3.2MHz and with a fixed preload of 41.1 mu N, the maximum rotational speed and torque achieved were approximately 1900 rpm and 5.37 mu N-mm, respectively, producing a maximum output power of 1.19 mu W. The surface vibrations were visualized using laser Doppler vibrometry and indicate that the rotational motion arises due to retrograde elliptical motions of the piezoelectric surface elements. Rotation about orthogonal axes in the plane of the substrate has been obtained by using orthogonally placed interdigital electrodes on the substrate to generate SAW impinging on the rotor, offering a means to generate rotation about an arbitrary axis in the plane of the substrate. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3662931]
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