Analysing magnetism using scanning SQUID microscopy

P. Reith, X. Renshaw Wang*, H. Hilgenkamp

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
92 Downloads (Pure)

Abstract

Scanning superconducting quantum interference device microscopy (SSM) is a scanning probe technique that images local magnetic flux, which allows for mapping of magnetic fields with high field and spatial accuracy. Many studies involving SSM have been published in the last few decades, using SSM to make qualitative statements about magnetism. However, quantitative analysis using SSM has received less attention. In this work, we discuss several aspects of interpreting SSM images and methods to improve quantitative analysis. First, we analyse the spatial resolution and how it depends on several factors. Second, we discuss the analysis of SSM scans and the information obtained from the SSM data. Using simulations, we show how signals evolve as a function of changing scan height, SQUID loop size, magnetization strength, and orientation. We also investigated 2-dimensional autocorrelation analysis to extract information about the size, shape, and symmetry of magnetic features. Finally, we provide an outlook on possible future applications and improvements.

Original languageEnglish
Article number123706
JournalReview of scientific instruments
Volume88
Issue number12
DOIs
Publication statusPublished - 1 Dec 2017

Fingerprint

SQUIDs
Magnetism
quantitative analysis
Microscopic examination
microscopy
Scanning
scanning
Magnetic flux
Chemical analysis
Autocorrelation
autocorrelation
magnetic flux
Magnetization
spatial resolution
Magnetic fields
interference
magnetization
probes
symmetry
magnetic fields

Cite this

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title = "Analysing magnetism using scanning SQUID microscopy",
abstract = "Scanning superconducting quantum interference device microscopy (SSM) is a scanning probe technique that images local magnetic flux, which allows for mapping of magnetic fields with high field and spatial accuracy. Many studies involving SSM have been published in the last few decades, using SSM to make qualitative statements about magnetism. However, quantitative analysis using SSM has received less attention. In this work, we discuss several aspects of interpreting SSM images and methods to improve quantitative analysis. First, we analyse the spatial resolution and how it depends on several factors. Second, we discuss the analysis of SSM scans and the information obtained from the SSM data. Using simulations, we show how signals evolve as a function of changing scan height, SQUID loop size, magnetization strength, and orientation. We also investigated 2-dimensional autocorrelation analysis to extract information about the size, shape, and symmetry of magnetic features. Finally, we provide an outlook on possible future applications and improvements.",
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Analysing magnetism using scanning SQUID microscopy. / Reith, P.; Renshaw Wang, X.; Hilgenkamp, H.

In: Review of scientific instruments, Vol. 88, No. 12, 123706, 01.12.2017.

Research output: Contribution to journalArticleAcademicpeer-review

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