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Coak, Matthew John, Jarvis, David and Cheng, Liu (2019) SquidLab. [Online]. . Coventry, UK ; Cambridge, UK: University of Warwick, Department of Physics ; University of Cambridge.
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Archive (ZIP)
squidlab-v2-9-1.zip - Other Available under License Special licence conditions apply, please see licence document for more details. Download (14Mb) |
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PDF
SquidLabManual_v2p9p1.pdf - Supplemental Material - Requires a PDF viewer. Download (2540Kb) | Preview |
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PDF
squidlab_changelog-2.9.pdf - Additional Metadata - Requires a PDF viewer. Download (12Kb) | Preview |
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PDF (Licence document)
Academic-Use-Licence-Warwick-Cambridge-SquidLab-Nov2019.pdf - Additional Metadata - Requires a PDF viewer. Download (258Kb) | Preview |
Abstract
-- Updated to version 2.9.1!
Oct 2021 -- Bugfixes and improvements on error handling, particularly in verifying the correct installation environment for new users.
-- Updated to version 2.9!
July 2021 -- See the changelog for full changes - Added 'Mirror positive field scans to create negative scans' checkbox. - Scan metadata changed to be Scan, rather than Session-specific. This metadata includes the x axis variable type (T or H), and fit geometry parameters to automatically pre-fill in the fitting panel. The main improvement is that now such details are not lost upon Saving and Loading a Session.
-- Updated to version 2.8!
Apr 2021 -- Added new importers to support use of the MPMS Reciprocating Sample Option (RSO).
-- Updated to version 2.7! Oct 2020
-- See the changelog for full changes - Now have a built-in graphing tab for quickly comparing data and background sweeps, and the option to sort datasets by temperature or field when importing.
-- Updated to version 2.6! July 2020
-- See the changelog - Can now save and load Sessions and collections of data for later processing, or to archive all background scans ready for action.
-- Updated to version 2.5! Feb 2020
-- See the changelog - includes support for Cryogenic S700X datafiles. SquidLab is a Matlab library with a full user-friendly GUI for importing, analyzing and plotting scans taken from a SQUID magnetometer.
It's designed to allow:
• Easy fitting of dipoles from raw V(z) voltage data.
• A unified import pipeline for the (often quite complex) raw scan data files.
• Fully-featured post-processing to resolve common issues with the raw data.
• Background subtraction of one scan from another.
• Fitting to the raw scans to obtain moment as a function of temperature or field. The Quantum Design Magnetic Property Measurement System (we support other instruments too, but this is the most common so let us focus on it) is a very sensitive instrument for measuring magnetic properties based on the SQUID magnetometer. However, sometimes for magnetically dilute samples or bulky sample holders and environments, their magnetic response can be so weak that it is comparable to the response from the sample holder used. The fitting algorithm employed by the MultiVu software for obtaining the magnetic moment can become unreliable in such cases (gets trapped in local minima, or the data no longer resemble the assumed dipole etc), and even the subtraction of the fitted background moment from the fitted sample+background moment does not result in a satisfactory outcome. In such cases, it becomes necessary to work directly with the SQUID voltages vs position data of the [sample + background] and [background] in order to recover the magnetic response due to the sample only and fit that to obtain meaningful information about the magnetic moment of the sample.
SquidLab is described in our paper 'SquidLab - A user-friendly program for background subtraction and fitting of magnetization data', Review of Scientific Instruments 91, 023901 (2020) available at https://doi.org/10.1063/1.5137820. Please cite this work if our software proves helpful to your research results.
Please contact Matt Coak at m.coak@ucl.ac.uk with any questions, requests for support, comments or feedback.
Thank you and good luck, happy subtracting!
| Item Type: | Digital Scholarly Resource | ||||||||||
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| Subjects: | Q Science > QC Physics | ||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
| Library of Congress Subject Headings (LCSH): | SquidLab , Computer programming, Magnetism, Magnetism -- Data processing, Magnetism -- Computer simulation | ||||||||||
| Publisher: | University of Warwick, Department of Physics ; University of Cambridge | ||||||||||
| Place of Publication: | Coventry, UK ; Cambridge, UK | ||||||||||
| Official Date: | November 2019 | ||||||||||
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| Publication Status: | Published | ||||||||||
| Media of Output (format): | Software application ; MathWorks MATLAB | ||||||||||
| Description: | SquidLab is a package written in Matlab to allow data processing and background subtraction of magnetisation data taken as a part of physics, chemistry and materials science research. It is released under an academic licence. The full licence file is included in the .zip download - use, modification or distribution of the software implies agreement to the licence terms. In short the licence allows free modification, copying and use of the source code - providing there is no commercial or financial gain and the software is used for research or academic purposes. The licence file and Fair Use code headers must be kept with any redistributed code. |
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| Version Number: | 2.9.1 | ||||||||||
| Version Number: | 2.9.1 | ||||||||||
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