title: Micromotors with built-in compasses.
abstract: We demonstrate here that iron containing rolled-up microtubular engines can be magnetized and act as compass needles - they sense the direction of an external magnetic field from afar and align the directionalities of their movements according to the external field, in a similar fashion to magnetotactic bacteria.
authors.affiliation: Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371.
authors.forename: Guanjia
authors.initials: G
authors.lastname: Zhao
authors.forename: Samuel
authors.initials: S
authors.lastname: Sanchez
authors.forename: Oliver G
authors.initials: OG
authors.lastname: Schmidt
authors.forename: Martin
authors.initials: M
authors.lastname: Pumera