ferrimagnetism

Thân thiện

A student observes ferrimagnetism in a classroom demonstration.

Definition

Noun: A type of magnetic ordering found in certain materials, especially ferrites, where the magnetic moments of atoms align in opposite directions but are of unequal magnitude. This results in a net, or overall, spontaneous magnetization because the opposing magnetic forces do not completely cancel each other out.

Usage

Ferrimagnetism is a specific property of materials and is used to describe their magnetic state. * Ferrimagnetism is weaker than ferromagnetism but stronger than antiferromagnetism. * The material's ferrimagnetism is stable below its Curie temperature.

Examples

• Magnetite (Fe₃O₄) is a classic example of a material that exhibits ferrimagnetism.
• The study focused on the temperature dependence of the compound's ferrimagnetism.
• Ferrimagnetism arises from the incomplete cancellation of antiparallel spins.

Advanced Usage

• Technical Context: In physics and materials science, ferrimagnetism is often discussed in contrast to ferromagnetism and antiferromagnetism. It is a key concept for understanding the behavior of ferrites used in electronics.
  • The device utilizes the ferrimagnetism of yttrium iron garnet for microwave applications.

Variants and Related Words

• Ferrimagnetic (adjective): Describing a material that exhibits ferrimagnetism.
  • The sample showed ferrimagnetic behavior below 450 K.
• Ferrite (noun): A ceramic compound, often an oxide of iron, which is a common ferrimagnetic material.
  • Ferrite cores are used in inductors due to their ferrimagnetic properties.

Synonyms

• Net magnetic ordering (descriptive phrase)
• Uncompensated antiferromagnetism (technical synonym)

Related Concepts (Not Synonyms)

• Ferromagnetism: A phenomenon where all magnetic moments align in the same direction, producing a strong net magnetization.
• Antiferromagnetism: A phenomenon where magnetic moments align in opposite directions with equal magnitude, resulting in no net magnetization.
• Magnetic Moment: The magnetic strength and orientation of an object that produces a magnetic field.
• Curie Temperature: The temperature above which a ferromagnetic or ferrimagnetic material loses its permanent magnetism.

Học thuật

Noun

1. a phenomenon in ferrites where there can be incomplete cancellation of antiferromagnetic arranged spins giving a net magnetic moment