Definition

1. Noun:
   • A physical phenomenon: Ferromagnetism is the property exhibited by certain materials, such as iron, nickel, and cobalt, where they become strongly magnetized in the presence of an external magnetic field and retain a significant portion of that magnetization after the field is removed.

Usage

• Ferromagnetism is a fundamental concept in physics and materials science.
• It is used to describe the intrinsic magnetic behavior of specific elements and alloys.
• This term is typically used in academic, scientific, and engineering contexts.

Examples

• The ferromagnetism of iron is what allows it to be made into permanent magnets.
• Understanding ferromagnetism is crucial for designing electric motors and data storage devices.
• The lecture explained the quantum mechanical origins of ferromagnetism.

Advanced Usage

• "Spontaneous ferromagnetism": Refers to the magnetization that occurs in a material even in the absence of an external magnetic field, below a certain temperature (the Curie temperature).
  • Below the Curie point, the material exhibits spontaneous ferromagnetism.
• "Itinerant ferromagnetism": A model describing ferromagnetism in metals like iron, where the magnetism arises from delocalized electrons.
  • The theory of itinerant ferromagnetism helps explain the magnetic properties of transition metals.

Variants and Related Words

• Ferromagnetic (adj): Describing a material that exhibits ferromagnetism.
  • Iron is a ferromagnetic material.
• Ferromagnet (n): A material that possesses ferromagnetism.
  • A bar magnet is a common type of ferromagnet.

Synonyms

• Strong magnetism: (In a general, non-technical sense) The property of being strongly magnetic.
• Permanent magnetism: Refers specifically to the retained magnetization, a key characteristic of ferromagnetism.

Related Phrases and Concepts

• Curie temperature: The temperature above which a ferromagnetic material loses its ferromagnetic properties.
  • When heated above its Curie temperature, iron loses its ferromagnetism.
• Magnetic domain: A region within a ferromagnetic material where the magnetic moments of atoms are aligned.
  • Ferromagnetism arises from the alignment of magnetic domains.
• Hysteresis loop: A characteristic curve showing the relationship between the magnetic field strength and the magnetization of a ferromagnetic material.
  • The hysteresis loop is a key feature for understanding the energy loss in ferromagnetic cores.

Noun

1. 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