Palkar V, Aprelev P, Salamatin A, Brasovs A, Kuksenok O, Kornev KG. Rotating magnetic nanorods detect minute fluctuations of magnetic field.
Phys Rev E 2019;
100:051101. [PMID:
31869886 DOI:
10.1103/physreve.100.051101]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Indexed: 11/07/2022]
Abstract
Magnetic nanorods rotating in a viscous liquid are very sensitive to any ambient magnetic field. We theoretically predicted and experimentally validated the conditions for two-dimensional synchronous and asynchronous rotation as well as three-dimensional precession and tumbling of nanorods in an ambient field superimposed on a planar rotating magnetic field. We discovered that any ambient field stabilizes the synchronous precession of the nanorod so that the nanorod precession can be completely controlled. This effect opens up different applications of magnetic nanorods as sensors of weak magnetic fields, for microrheology, and generally for magnetic levitation.
Collapse