Journal
APPLIED PHYSICS LETTERS
Volume 110, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4984137
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Funding
- National Natural Science Foundation of China [61575129]
- China Postdoctoral Science Foundation [2015M582408]
- Natural Science Foundation of Guangdong Province [2016A030310059]
- Shenzhen Science and Technology Research Project [JCYJ20160422103744090, JCYJ20160427105041864, JSGG20160429114438287]
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The development of simple and sensitive sensors with the capability of simultaneously detecting magnetic field intensity and its direction in three-dimensional (3D) space is a technical imperative for magnetic field detection. In this paper, we first demonstrated the mechanism of anisotropic manipulation of ferromagnetism nanoparticles (FMNPs) in a non-continuous magnetic fluid film with the aid of varying magnetic fields. Second, based on the anisotropic distribution of the FMNPs around an optical fiber, we fabricated a vector magnetometer with a direction error of +/- 1.9 degrees and an intensity sensitivity of 222.0 pm/mT, respectively. The sensing mechanism relies on the magnetism-controllable effective refractive index modification of asymmetric cladding modes in an in-line fiber-optic Mach-Zehnder interferometer. Compared to the previously reported intensity-based magnetometers, the as-fabricated magnetometer also provides an avenue to monitor the vector direction of the magnetic field in 3D space. Published by AIP Publishing.
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