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Title: A scanning Hall probe microscope for high resolution magnetic imaging down to 300 mK

Abstract

We present the design, construction, and performance of a low-temperature scanning Hall probe microscope with submicron lateral resolution and a large scanning range. The detachable microscope head is mounted on the cold flange of a commercial {sup 3}He-refrigerator (Oxford Instruments, Heliox VT-50) and operates between room temperature and 300 mK. It is fitted with a three-axis slip-stick nanopositioner that enables precise in situ adjustment of the probe location within a 6x6x7 mm{sup 3} space. The local magnetic induction at the sample surface is mapped with an easily changeable microfabricated Hall probe [typically GsAs/AlGaAs or AlGaAs/InGaAs/GaAs Hall sensors with integrated scanning tunnel microscopy (STM) tunneling tips] and can achieve minimum detectable fields {>=}10 mG/Hz{sup 1/2}. The Hall probe is brought into very close proximity to the sample surface by sensing and controlling tunnel currents at the integrated STM tip. The instrument is capable of simultaneous tunneling and Hall signal acquisition in surface-tracking mode. We illustrate the potential of the system with images of superconducting vortices at the surface of a Nb thin film down to 372 mK, and also of labyrinth magnetic-domain patterns of an yttrium iron garnet film captured at room temperature.

Authors:
;  [1];  [1]
  1. Department of Physics, University of Bath, Claverton Down, BA2 7AY Bath (United Kingdom)
Publication Date:
OSTI Identifier:
21266727
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 79; Journal Issue: 12; Other Information: DOI: 10.1063/1.3046285; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ALUMINIUM ARSENIDES; FERRITE GARNETS; GALLIUM ARSENIDES; HALL EFFECT; HELIUM 3; INDIUM ARSENIDES; MICROSCOPES; NIOBIUM; PROBES; RESOLUTION; SCANNING TUNNELING MICROSCOPY; SURFACES; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; TUNNEL EFFECT; YTTRIUM

Citation Formats

Khotkevych, V V, Bending, S J, Milosevic, M V, and Department Fysica, Universiteit Antwerpen, Groenenborgelaan 171, 2020 Antwerpen. A scanning Hall probe microscope for high resolution magnetic imaging down to 300 mK. United States: N. p., 2008. Web. doi:10.1063/1.3046285.
Khotkevych, V V, Bending, S J, Milosevic, M V, & Department Fysica, Universiteit Antwerpen, Groenenborgelaan 171, 2020 Antwerpen. A scanning Hall probe microscope for high resolution magnetic imaging down to 300 mK. United States. https://doi.org/10.1063/1.3046285
Khotkevych, V V, Bending, S J, Milosevic, M V, and Department Fysica, Universiteit Antwerpen, Groenenborgelaan 171, 2020 Antwerpen. Mon . "A scanning Hall probe microscope for high resolution magnetic imaging down to 300 mK". United States. https://doi.org/10.1063/1.3046285.
@article{osti_21266727,
title = {A scanning Hall probe microscope for high resolution magnetic imaging down to 300 mK},
author = {Khotkevych, V V and Bending, S J and Milosevic, M V and Department Fysica, Universiteit Antwerpen, Groenenborgelaan 171, 2020 Antwerpen},
abstractNote = {We present the design, construction, and performance of a low-temperature scanning Hall probe microscope with submicron lateral resolution and a large scanning range. The detachable microscope head is mounted on the cold flange of a commercial {sup 3}He-refrigerator (Oxford Instruments, Heliox VT-50) and operates between room temperature and 300 mK. It is fitted with a three-axis slip-stick nanopositioner that enables precise in situ adjustment of the probe location within a 6x6x7 mm{sup 3} space. The local magnetic induction at the sample surface is mapped with an easily changeable microfabricated Hall probe [typically GsAs/AlGaAs or AlGaAs/InGaAs/GaAs Hall sensors with integrated scanning tunnel microscopy (STM) tunneling tips] and can achieve minimum detectable fields {>=}10 mG/Hz{sup 1/2}. The Hall probe is brought into very close proximity to the sample surface by sensing and controlling tunnel currents at the integrated STM tip. The instrument is capable of simultaneous tunneling and Hall signal acquisition in surface-tracking mode. We illustrate the potential of the system with images of superconducting vortices at the surface of a Nb thin film down to 372 mK, and also of labyrinth magnetic-domain patterns of an yttrium iron garnet film captured at room temperature.},
doi = {10.1063/1.3046285},
url = {https://www.osti.gov/biblio/21266727}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 12,
volume = 79,
place = {United States},
year = {2008},
month = {12}
}