Physical Chemistry> Explain Ferrimagnetism?

Explain Ferrimagnetism?

venkat , 9 Years ago

Grade 12

3 Answers

SHANMUKESHWAR

Last Activity: 9 Years ago

Ferrimagnetism. In physics, a ferrimagnetic material is one that has populations of atoms with opposing magnetic moments, as in antiferromagnetism; however, in ferrimagnetic materials, the opposing moments are unequal and a spontaneous magnetization remains.

KUNCHAM SAMPATH

Last Activity: 9 Years ago

Ferrimagnetism: The substances in which the magnetic moments of the domains
are aligned in parallel and anti-parallel directions, in unequal numbers, are said to have
ferrimagnetism. Examples include Fe3O4 (magnetite), ferrites such as MgFe2O4 and
ZnFe2O4.
Ferrimagnetic substances are weakly attracted by a magnetic field as compared to
ferromagnetic substances. On heating, these substances become paramagnetic.

Approved

santhosh

Last Activity: 9 Years ago

In physics, a ferrimagnetic material is one that has populations of atoms with opposing magnetic moments, as in antiferromagnetism; however, in ferrimagnetic materials, the opposing moments are unequal and a spontaneous magnetization remains.^[1] This happens when the populations consist of different materials or ions (such as Fe²⁺ and Fe³⁺).

Ferrimagnetism is exhibited by ferrites and magnetic garnets. The oldest known magnetic substance, magnetite (iron(II,III) oxide; Fe₃O₄), is a ferrimagnet; it was originally classified as a ferromagnet before Néel's discovery of ferrimagnetism and antiferromagnetism in 1948.^[2]

Some ferrimagnetic materials are YIG (yttrium iron garnet), cubic ferrites composed of iron oxides and other elements such as aluminum, cobalt, nickel, manganese and zinc, hexagonal ferrites such as PbFe₁₂O₁₉ and BaFe₁₂O₁₉, and pyrrhotite, Fe_1-xS.^[3]