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An ultra-low temperature scanning Hall probe microscope for magnetic imaging below 40 mK

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Karci Ozgur, Piatek Julian O., Jorba Pau, Dede Munir, Ronnow Henrik M., Oral Ahmet,
Project Setup for studies of quantum phenomena in condensed matter systems at ultra-low temperatures in magnetic vector fields
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Original article (peer-reviewed)

Journal REVIEW OF SCIENTIFIC INSTRUMENTS
Volume (Issue) 85(10)
Page(s) 103703
Title of proceedings REVIEW OF SCIENTIFIC INSTRUMENTS
DOI 10.1063/1.4897145

Open Access

URL https://infoscience.epfl.ch/record/204170?ln=en
Type of Open Access Repository (Green Open Access)

Abstract

We describe the design of a low temperature scanning Hall probe microscope (SHPM) for a dilution refrigerator system. A detachable SHPM head with 25.4 mm OD and 200 mm length is integrated at the end of the mixing chamber base plate of the dilution refrigerator insert (Oxford Instruments, Kelvinox MX-400) by means of a dedicated docking station. It is also possible to use this detachable SHPM head with a variable temperature insert (VTI) for 2 K-300 K operations. A microfabricated 1 mu m size Hall sensor (GaAs/AlGaAs) with integrated scanning tunneling microscopy tip was used for magnetic imaging. The field sensitivity of the Hall sensor was better than 1 mG/root Hz at 1 kHz bandwidth at 4 K. Both the domain structure and topography of LiHoF4, which is a transverse-field Ising model ferromagnet which orders below T-C = 1.53 K, were imaged simultaneously below 40 mK. (C) 2014 AIP Publishing LLC.
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