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Next article
Published Online: June 2014
Accepted: March 2014

MagnetoSperm: A microrobot that navigates using weak magnetic fields

Islam S. M. Khalil1, a), Herman C. Dijkslag2, Leon Abelmann3,4, and Sarthak Misra2, b)
View Affiliations
  • 1German University in Cairo, New Cairo City 13411, Egypt
  • 2MIRA–Institute for Biomedical Technology and Technical Medicine, University of Twente, 7500 AE Enschede, The Netherlands
  • 3MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
  • 4Korean Institute of Science and Technology, 66123 Saarbrücken, Germany

    • a)Electronic mail: .

    b)Electronic mail: .

DOI: http://dx.doi.org/10.1063/1.4880035
PDF
Magnetic fieldsMagnetic headsNickelTorquePolymer structure
Abstract
In this work, a propulsion system similar in motion to a sperm-cell is investigated. This system consists of a structure resembling a sperm-cell with a magnetic head and a flexible tail of 42 μm and 280 μm in length, respectively. The thickness, length, and width of this structure are 5.2 μm, 322 μm, and 42 μm, respectively. The magnetic head includes a 200 nm-thick cobalt-nickel layer. The cobalt-nickel layer provides a dipole moment and allows the flexible structure to align along oscillating weak (less than 5 mT) magnetic field lines, and hence generates a propulsion thrust force that overcomes the drag force. The frequency response of this system shows that the propulsion mechanism allows for swimming at an average speed of 158 ± 32 μm/s at alternating weak magnetic field of 45 Hz. In addition, we experimentally demonstrate controlled steering of the flexible structure towards reference positions.

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