Superconducting disc locked in levitation.

The make-up of the disc is key: it’s composed of sapphire crystals, which are poor conductors, coated with a thin layer of yttrium barium copper oxide, which is a superconductor. Superconductors hate [expel] magnetic fields due to a phenomenon called the { Meissner effect }. Since electrical current and magnetic fields are related to one another, and electrical current flows very easily in a superconductor, subjecting it to a magnetic field will create currents that expel the field inside it. The device will then resist any changes, like falling down, that might change the magnetic fields it contains.  

Almog’s disc can be locked in place thanks to tiny gaps in the ultra-thin superconducting coating that allow some of the magnetic fields to seep in. Since the superconductor hates [expels] magnetic fields, it traps them in weak areas. So the tiny spaces act as pins, holding up the disc in space.

{ New Scientist }

  1. lebedynyyshlyakh reblogged this from olena
  2. braingasmic reblogged this from olena and added:
    I want to play with it.
  3. olena posted this
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