Magnetic materials-how to tell

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SUMMARY

The discussion focuses on identifying magnetic materials using the periodic table and understanding the composition of fridge magnets. It is established that there are only four stable ferromagnetic elements: iron, cobalt, nickel, and gadolinium. Fridge magnets are composed of a rubber-like material embedded with ferrite, specifically magnetic oxides such as magnetite (Fe3O4) or barium ferrite. The magnetic properties of materials cannot be determined solely by visual inspection of the periodic table unless it explicitly indicates magnetic characteristics.

PREREQUISITES
  • Understanding of ferromagnetism and magnetic materials
  • Familiarity with the periodic table and its properties
  • Knowledge of materials science, specifically magnetic oxides
  • Basic concepts of magnetic fields and polarity
NEXT STEPS
  • Research the properties of the four stable ferromagnetic elements: iron, cobalt, nickel, and gadolinium
  • Explore the composition and manufacturing process of ferrite magnets
  • Learn about Hallbach arrays and their applications in magnetic materials
  • Investigate the magnetic properties of other materials listed in the periodic table
USEFUL FOR

This discussion is beneficial for materials scientists, physics students, and anyone interested in the properties of magnetic materials and their applications in everyday items like fridge magnets.

aiop
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How can i tell based on looking at the periodic table what elements will be magnetic. If that is impossible what are examples of ferromagnetic materials and aside form the periodic table is there any other way to tell?

As well what are fridge magnets made out of ? The ones with the black backs that are bendable, they almost seem like rudder.

Thanks!
 
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Fridge magnets are some kind of rubber with pieces of ferrite in them. That is magnetic oxides of iron, like magnetite (Fe3O4) or barium ferrite. The magnetic regions are typically stripes of alternating polarity (Hallbach array), only magnetic on one side.
 
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