#magnetism__magnetic_attraction__magnetic_force  attraction for iron; associated with electric currents as well as magnets; characterized by fields of force
  supertype:  attractive_force__attraction  the force by which one object attracts another
  subtype:  electromagnetism  magnetism produced by an electric current; "electromagnetism was discovered when it was observed that a copper wire carrying an electric current can magnetize pieces of iron or steel near it"
  subtype:  antiferromagnetism  magnetic field creates parallel but opposing spins; varies with temperature
     subtype:  ferrimagnetism  a phenomenon in ferrites where there can be incomplete cancellation of antiferromagnetic arranged spins giving a net magnetic moment
  subtype:  diamagnetism  phenomenon exhibited by materials like copper or bismuth that become magnetized in a magnetic field with a polarity opposite to the magnetic force; unlike iron they are slightly repelled by a magnet
  subtype:  ferromagnetism  phenomenon exhibited by materials like iron (nickel or cobalt) that become magnetized in a magnetic field and retain their magnetism when the field is removed
  subtype:  paramagnetism  materials like aluminum or platinum become magnetized in a magnetic field but it disappears when the field is removed

1 statement is about an indirect instance of magnetism (electromagnetism): graph1_on_electromagnetism
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