1. Flexible magnetostrictive devices for wireless power harvesting and transport Ben Siegfried McAlpine Group Department of Mechanical and Aerospace Engineering Princeton University

2. What is Energy Harvesting? Scavenging power for small scale energy systems From the Human Body T. Starner, IBM Syst. J., 1996, 35, 618–629. From the Natural World http://www.superstock.co.uk/stock- photos-images/1555R-308348

3. Using piezoelectric materials http://www.physikinstrumente.com/en/pro ducts/prdetail.php?sortnr=400600.00 Piezomagnetism: mechanical strain --> voltage BUT: fragile; necessitates fabricating gold electrodes Y. Qi, J. Kim, T. D. Nguyen, B. Lisko, P. K. Purohit, M. C. McAlpine. Nano Lett. 11, 1331-1336 (2011).

4. Magnetomechanical effects Piezomagnetism P. Lukashev, R. Sabirianov, and K. Belashchenko. Physical Review B, 78:184414, 2008. Magnetostriction http://www.sensorland.com/

5. The Devices SiO 2 E-beam SiO 2 Cr/Cr 2 O 3 Ni Cr SiO 2 Cr 2 O 3 Ni Cr 3 hr @ 550C SiO 2 Cr 2 O 3 Ni Cr PDMS FeCl 3 PDMS Cr 2 O 3 Cr 2 O 3 – a room temperature piezomagnetic

6. The Devices

7. Terfenol-D films are a little trickier…

8. Future Work Nail down transfer procedures Characterize magnetic properties using a high- resolution magnetometer Transfer to silk films Implant and test in animal tissue

9. Future Work Y. Zhang and G. Liu. IEEE International Conference on Robotics and Biomimetics, pages 195–200, 2005. R. C. O’Handley, J. K. Huang, D. C. Bono, and J. Simon. IEEE Sensors Journal, 8(1):57–62, January 2008. L. Wang and F.G. Yuan. SPIE Smart Structures and Materials International Symposium, March 2007

10. Acknowledgements PEI Energy Grand Challenge Departments of Chemistry and Mechanical and Aerospace Engineering Professor Mike McAlpine Manu, Jeff, Booyeon, Kevin Thanh, Kellye, Yong, Yao