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Balance and Training

Stan Trout, Spontaneous Materials
It was nice to see so many people at Magnetics 2018 in Orlando last month. It was a very pleasant exchange of ideas and information. We all seemed to get plenty of exercise, walking through the Hyatt Regency to our meeting rooms.

I had the good fortune on the first day to be part of the Keynote Panel Discussion called The Future of the Magnetics Industry Pricing, Trends, Technology. I thought I would use this opportunity to share some of the answers I provided to questions posed to the panel. MORE

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].

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