Faraday effect
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The Faraday effect or Faraday rotation, sometimes referred to as the magneto-optic Faraday effect, is a physical magneto-optical phenomenon. The Faraday effect causes a polarization rotation which is
Michael Faraday holding a piece of glass of the type he used to demonstrate the effect of magnetism on polarization of light, c. 1857.
Magneto-optic Kerr effect
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In physics the magneto-optic Kerr effect or the surface magneto-optic Kerr effect is one of the magneto-optic effects. It describes the changes to light reflected from a magnetized surface. It is used
Faraday effect
…velocity between right and left-handed polarized light, based on Airy's theory. He also discovered negative Faraday rotation in iron salts. In 1876, the magneto-optic Kerr effect was discovered by John Kerr, changes in light polarization when reflected from a magnetic surface. In 1878, August Kundt and Wilhelm Röntgen demonstrated…
Several grains of NdFeB with magnetic domains made visible via contrast with a Kerr microscope.