What are the applications of Quadrupole Neodymium magnets?

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SUMMARY

The discussion focuses on Quadrupole Neodymium magnets, particularly their applications and associated patents. Key manufacturers such as GE and Sumitomo hold most patents related to Neodymium Iron Boron (NdFeB) magnets, especially those containing cobalt and exhibiting a tetragonal crystalline structure. The conversation highlights the significance of Co doping in enhancing properties like critical temperature (Tc) and uniaxial anisotropy. Additionally, it notes that Quadrupole Neodymium magnets are utilized in particle accelerators and possess unique four-pole configurations.

PREREQUISITES
  • Understanding of Neodymium Iron Boron (NdFeB) magnet technology
  • Familiarity with cobalt doping and its effects on magnetic properties
  • Knowledge of patent law as it pertains to magnet technology
  • Basic principles of particle accelerator design and function
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  • Research the impact of cobalt doping on Neodymium magnets
  • Investigate the patent landscape for NdFeB magnets held by GE and Sumitomo
  • Explore the design and functionality of Quadrupole magnets in particle accelerators
  • Learn about the differences between permanent magnets and electromagnets
USEFUL FOR

Engineers, researchers, and manufacturers involved in magnet technology, particularly those focusing on high-performance applications in particle physics and related fields.

boeland
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There are lots of patents on Neo magnets and they are difficult to sort out. Some of the patents restrict the use of the magnets that contain cobalt and/or have a tetragonal crystalline structure.
Does someone know:

What types of magnets contain cobalt?
What types of magnets have a tetragonal structure?
 
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Most NdFeB magnet patents are held by GE and/or Sumitomo. You should check with them.

I expect there's a lot of literature on Co doping in the Fe site (I think it increases Tc and uniaxial anisotropy, up to some optimal doping), but know absolutely nothing about patents here.
 
The Neomax (Sumitomo) and Magnequench (GM) patents do require licences for Neo magnets that contain cobalt and have tetragonal structures. I am curious if all high energy (>30MOe) and high temperature (>110C) magnets use this type of technology.
 
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Does anyone know who has the patents on Quadrupole Neodymium. I found a video of one on YouTube:

You can find these magnets in particle accelerators, and they have 4 poles (Quadrupole). This one is a permanent magnet, and without the video I couldn't tell the difference between it and an ordinary bar magnet.
 
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