Author Archives: Editorial Staff

April 2017

  • Recent Developments and Trends in Nd-Fe-B Magnets
  • Miniaturized LC Filters for Suppression of EMI
  • Kool Mµ MAX: The Next Generation of Sendust Cores from Magnetics
  • CST Studio Suite Version 2017 Now Shipping
  • Permanent Magnet Market Size to Surpass $50 Billion by 2024

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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 material’s magnetic properties is that of a major hysteresis loop. The hysteresis or M(H) loop is typically used to determine a material’s 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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Magnet Applications, Inc. Expands Online Tech Center and Launched Calculator Apps

Magnet Applications, Inc. Awarded ITAR Certification

Momentum Licenses ORNL Technology

Summer 2017

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

Berkeley Lab Scientists Discover New Atomically Layered, Thin Magnet
It may not seem like a material as thin as an atom could hide any surprises, but a research team led by scientists at the Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) discovered an unexpected magnetic property in a two-dimensional material. The scientists found that a 2-D van der Waals crystal, part of a class of material whose atomically thin layers can be peeled off one by one with adhesive tape, possessed an intrinsic ferromagnetism.

Noise Suppression Sheets: Ultra-Thin Magnetic Sheets with High Permeability
TDK Corp. has expanded its Flexield family of noise suppression sheets with an ultra-thin copper-clad laminated sheet with high magnetic permeability. The IFM10M magnetic sheets are 60 percent thinner than existing sheets with a magnetic layer of the same thickness, but offer an equivalent noise suppression performance over a broad frequency range from 500 kHz to 10 GHz. The total thickness of the new Flexield sheets is just 0.04 mm. The size of the sheets is 300 mm by 200 mm.

Permanent Magnet Market Size to Surpass $50 Billion by 2024
Permanent Magnet Market size is slated to exceed $50 billion by the end of 2024; according to a new research report by Global Market Insights, Inc. With global fossil fuel reserve set to deplete in the next 50 to 70 years, energy generation focus is shifting towards the renewable and emission free sources. Wind energy has come up to be a prominent renewable source of energy with a total installed capacity of over 400 gigawatts all around the globe, and more than 200 gigawatts been installed since 2010. Permanent magnet market size in the energy generation sector will increase substantially in the near future as the UN has aimed at 100 percent emission free energy generation by the end of 2050.

Permanent Magnet Mistakes, Part Seven
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.
The last two mistakes on my list are:
• Ignoring appropriate mechanical considerations, such as using
a magnet as a structural part, believing that chips and cracks are not normal for brittle materials, or ignoring the effect of magnetic debris.
• Treating magnets as toys

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Scientists Discover a 2-D Magnet

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