Magnetometry Measurements: Considerations for Magnetic and First-Order-Reversal-Curve Measurements

Brad C. Dodrill, Lake Shore Cryotronics, Inc.

Magnetometers are used to characterize magnetic material properties. Magnetometry techniques can be broadly classified into two categories: inductive and force-based. Common inductive methods include vibrating sample magnetometry (VSM), extraction magnetometry, AC susceptometry and superconducting quantum interference device (SQUID) magnetometry. The two most commonly used inductive techniques are VSM and SQUID magnetometry. Alternating gradient magnetometry (AGM) is the most often used force-based technique. The measurement most commonly performed to characterize a materialís magnetic properties is that of a major hysteresis loop. The hysteresis or M(H) loop is typically used to determine a materialís saturation magnetization Ms (the magnetization at maximum applied field), remanence Mr (the magnetization at zero applied field after applying a saturating field) and coercivity Hc (the field required to demagnetize the material). More complex magnetization curves covering states with field and magnetization values located inside the major hysteresis loop, such as first-order-reversal-curves (FORCs), can provide additional information that can be used to characterize magnetic interactions and coercivity distributions in magnetic materials[1].


Permanent Magnet Mistakes, Part Seven

Stan Trout, Spontaneous Materials

We conclude this series with the seventh and final blog, describing the many types of mistakes made with permanent magnets. My intent is to help engineers in the future avoid mistakes made in the past, and not to embarrass anyone.


Bunting Magnetics Europe Ltd Secures Quality and Environmental Accreditation
Magnet Applications, Inc. Expands Online Tech Center and Launched Calculator Apps
Magnet Applications, Inc. Awarded ITAR Certification
Premier Magnetics Drum Cores for EMI Filtering and Switch Mode Power Supplies
Magnet Applications, Inc. Announces Product Upgrade with B12 Neodymium Compression Bonded Magnets
Pulse Electronics Power BU Releases New AEC-Q200 Qualified PA1005.XXXQNL Current Sense Transformer Series
ANSYS 18.1 Expands Pervasive Engineering Simulation
COMSOL Brings Powerful Modeling Tools, Solver Technology, and App Deployment to Engineers and Scientists
CST Studio Suite Version 2017 Now Shipping
Accurate Magnetic Scales Equals Quality of Optical Scales
New VSM Combines High Sensitivity, Speed for Advanced Measurement Performance
Metrolab Launches the PT-2026 NMR Teslameter