1 fm/Hz noise level low temperature Fabry-Pérot atomic force/magnetic force microscope operating in 4–300 K temperature range

In this publication, we describe the design of a new fiber Fabry-Pérot interferometer and employ this to a low temperature atomic force/magnetic force microscope (LT-AFM/MFM) operating in the 4–300 K temperature range. A multilayer dielectric mirror coated optical fiber is used to achieve unpreceden...

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Bibliographic Details
Published in:Review of scientific instruments 2020-01, Vol.91 (1), p.013703-013703
Main Authors: Karc, Özgür, Çelik, Ümit, Oral, Ahmet
Format: Article
Language:English
Subjects:
Coated fibers
Crystal lattices
Disk drives
Fabry-Perot interferometers
Low temperature
Magnetic force microscopy
Multilayers
Noise levels
Optical fibers
Scientific apparatus & instruments
Shot noise
Single crystals
Thin films
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Summary:In this publication, we describe the design of a new fiber Fabry-Pérot interferometer and employ this to a low temperature atomic force/magnetic force microscope (LT-AFM/MFM) operating in the 4–300 K temperature range. A multilayer dielectric mirror coated optical fiber is used to achieve unprecedented 1 fm/Hz noise level, while the shot noise limit is 0.51 fm/Hz. The cavity length is adjustable, and the fiber can be brought within a very close proximity of the cantilever using a dedicated 2 mm stroke piezonanopositioner integrated on the piezotube scanner. The same nanopositioner also is used to park the fiber at a safe parking location during cantilever exchange. We demonstrate the performance of the LT-AFM/MFM by imaging the ITO thin film at 300 K, atomic steps on HOPG at 300 K, magnetic bits on the hard disk at 15 K, and the Abrikosov vortex lattice in the BSCCO(2122) single crystal at 4 K.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5120007