Definition

Noun: A property of certain materials where the magnetic moments of atoms or molecules align in a regular pattern with neighboring spins pointing in opposite directions, resulting in no net macroscopic magnetization. This ordered state arises from an interaction that favors antiparallel alignment and its strength varies with temperature.

Usage

Antiferromagnetism is a technical term used primarily in physics and materials science to describe a specific type of magnetic ordering. - The study focused on the antiferromagnetism observed in the nickel oxide compound. - Below the Néel temperature, the material exhibits antiferromagnetism.

Advanced Usage

• "to suppress antiferromagnetism": To reduce or eliminate this magnetic state, often through doping or applying a magnetic field.
  • Applying pressure can help suppress antiferromagnetism in the sample.
• "competing antiferromagnetism": Used when this state is in opposition with another ordered state, like ferromagnetism or superconductivity.
  • The phase diagram shows a region of competing antiferromagnetism and superconductivity.

Variants and Related Words

• Antiferromagnetic (adj): Having the properties of antiferromagnetism.
  • The material enters an antiferromagnetic phase at low temperatures.
• Antiferromagnet (n): A material that exhibits antiferromagnetism.
  • Manganese oxide is a classic antiferromagnet.

Synonyms

• Antiparallel magnetic ordering: A more descriptive technical synonym.
• Spin antiparallel alignment: Refers specifically to the orientation of the magnetic moments.

Related Scientific Concepts

• Néel temperature: The critical temperature above which antiferromagnetic order is lost.
  • The antiferromagnetism disappears above the Néel temperature.
• Superexchange: A common mechanism that mediates the antiferromagnetic interaction in insulating materials.

Noun

1. magnetic field creates parallel but opposing spins; varies with temperature