What causes Ferrimagnetism?

Ferrimagnetism has the same physical origins as ferromagnetism and antiferromagnetism. In ferrimagnetic materials the magnetization is also caused by a combination of dipole-dipole interactions and exchange interactions resulting from the Pauli exclusion principle.

Which of the magnetic material shows spontaneous magnetization?

ferromagnetic
Spontaneous magnetization is the appearance of an ordered spin state (magnetization) at zero applied magnetic field in a ferromagnetic or ferrimagnetic material below a critical point called the Curie temperature or TC .

How does the permeability of ferromagnetic and ferrimagnetic materials change with temperature when the temperature is greater than the Curie temperature?

When ferromagnetic material heated beyond curie temperature, turns into paramagnetic material, as the ferromagnetic domains become random. Curie temperature: Curie temperature is the temperature at which the magnetic properties of a material change.

What is Ferrimagnetism example?

Ferrimagnetism is another type of magnetic ordering. The best example of a ferrimagnetic mineral is magnetite (Fe3O4). Two iron ions are trivalent, while one is divalent. The two trivalent ions align with opposite moments and cancel one another, so the net moment arises from the divalent iron ion.

What is Ferrimagnetism and antiferromagnetism?

Ferrimagnetism and antiferromagnetism are two magnetic properties of materials. In contrast to antiferromagnetic materials, ferrimagnetic materials are strongly attracted to a magnetic field. In such a material, the two ferromagnetic sublattices and their magnetic properties cancel each other out.

What is the difference between antiferromagnetism and Ferrimagnetism?

The major difference between the two is that the net magnetic moment of the former is non-zero while in the latter it is zero. Antiferromagnetic materials thus do not exhibit spontaneous magnetization, while ferrimagnetic materials do.

Which type of magnetic material does not show any spontaneous magnetization?

Ferromagnetism and Antiferromagnetism The spontaneous magnetization is not apparent in materials which have not been exposed to an external field, because of the presence of domains in the material each having its own direction of magnetization.

What do you mean by spontaneous magnetization hence derive Curie Weiss law for ferromagnetic materials?

The Curie-Weiss law can be derived using arguments proposed by Weiss. In the ferromagnetic materials the moments are magnetized spontaneously, which implies the presence of an internal field to produce this magnetization. Weiss assumed that this field is proportional to the magnetization, i.e.

Why do ferromagnetic lose their magnetism at the Curie temperature?

Materials have different structures of intrinsic magnetic moments that depend on temperature; the Curie temperature is the critical point at which a material’s intrinsic magnetic moments change direction. Higher temperatures make magnets weaker, as spontaneous magnetism only occurs below the Curie temperature.

What happens to a ferromagnetic material when its temperature increases above Curie temperature?

At a certain critical temperature, the magnetism is lost. Above curie temperature, a substance lose their magnetic properties. Hence, when a ferromagnetic substance heated above curie temperature, its ferromagnetic properties gets lost and it converts to para magnetic substances.

What is difference between antiferromagnetism and ferrimagnetism?

What is ferrimagnetism and antiferromagnetism?

Why does ferrimagnetism occur in ferrimagnetic materials?

For ferrimagnetic materials these moments are unequal in magnitude so a spontaneous magnetization remains. This can for example happen when the populations consist out of different atoms or ions (such as Fe 2+ and Fe 3+ ). Ferrimagnetism has often been confused with ferromagnetism.

Is magnetite a ferromagnetic material?

Magnetite is a well known ferrimagnetic material. Indeed, magnetite was considered a ferromagnet until Néel in the 1940’s, provided the theoretical framework for understanding ferrimagnetism. Magnetite, Fe 3 O 4 crystallizes with the spinel structure.

What is the difference between magnetic moment and ferrimagnetic moment?

The main difference is that in ferrimagnetic materials there are different types of atoms in the material’s unit cell. An example of this can be seen the figure on the right. Here the atoms with a smaller magnetic moment point in the opposite direction of the larger moments.

How does a ferromagnetic material work?

In a ferromagnetic material, the individual atoms possess a dipole moment, similar to a paramagnetic material. When placed in a magnetic field, the atoms interact with one another and get spontaneously aligned in a common direction.