Ferromagnetic Fluid

A ferro fluid or ferromagnetic fluid is a liquid that becomes strongly magnetized in the presence of a magnetic field. It’s a common known fact that small iron objects get attracted to magnets. Due to the magnetic power.

Today we will learn how to make ferromagnetic fluids with the help of simple things.

Things You need

  1. Neodymium magnet
  2. Cooking oil
  3. Cup
  4. Stick


Take half a cup of laser printer toner powder.
Add some oil to it and Don’t put the powder too much as we want it to be viscous.
Mix this mixture with a stick.
Hold the liquid on any surface like a glass plate.
Place the magnet under this glass plate.
Observe that the magnet is pulled towards the plate right behind the fluid and get stuck to the surface.
Now take the magnet and hold it right above the liquid. Notice how this liquid rises and crawls over the magnet.


The toner powder used in laser printers contains 40% fine iron dust at nano scale which usually has a diameter of around 10 nanometer or less. In other ways these nanoparticles of magnetite, hematite, or some other compounds contain iron so when this powder mixed in oil acts as a liquid magnet.
Ferromagnetic fluids are colloidal liquids made of ferromagnetic particles with fluids that are usually organic solvents like oil and water.