MagnetoSperm: A microrobot that navigates using weak magnetic fields

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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 5mT) 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.
Original languageUndefined
Pages (from-to)223701
Number of pages4
JournalApplied physics letters
Volume22
Issue number2
DOIs
Publication statusPublished - 2 Jun 2014

Keywords

  • EWI-25730
  • IR-94249
  • METIS-309899

Cite this

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title = "MagnetoSperm: A microrobot that navigates using weak magnetic fields",
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 5mT) 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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journal = "Applied physics letters",
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MagnetoSperm: A microrobot that navigates using weak magnetic fields. / Khalil, I.S.M.; Dijkslag, Herman C.; Abelmann, Leon; Misra, Sarthak.

In: Applied physics letters, Vol. 22, No. 2, 02.06.2014, p. 223701.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - MagnetoSperm: A microrobot that navigates using weak magnetic fields

AU - Khalil, I.S.M.

AU - Dijkslag, Herman C.

AU - Abelmann, Leon

AU - Misra, Sarthak

N1 - eemcs-eprint-25730

PY - 2014/6/2

Y1 - 2014/6/2

N2 - 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 5mT) 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.

AB - 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 5mT) 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.

KW - EWI-25730

KW - IR-94249

KW - METIS-309899

U2 - 10.1063/1.4880035

DO - 10.1063/1.4880035

M3 - Article

VL - 22

SP - 223701

JO - Applied physics letters

JF - Applied physics letters

SN - 0003-6951

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