2016 Mar

Ferromagnetic Materials and their Properties

March 21, 2016

ferromagnetic fluid

Ferromagnetic materials are substances those are powerfully magnetized in the magnetic field direction when exposed to one. Examples of these materials include cobalt, nickel, iron, and rare earth metals. This article will focus on ferromagnetic materials and their respective properties.

Ferromagnetism is the capability by which materials form a permanent magnet or is attracted by a magnet when the materials are positioned in a magnetic field. There are different types of magnetism, where the strongest is the ferromagnetism. Materials that possess ferromagnetism properties are referred to as ferromagnetic materials. The forces of magnetism developed by these materials are extremely substantial. Interestingly, many of these materials are employed in our daily life. A fridge magnet is a very good illustration. It’s used in posting reminders and purchasing lists, or used for decorative purposes.

The application field of ferromagnetic materials is very broad, for instance, electrical generators and motors, telephones, loudspeakers, transformers, magnetic recording gadgets, like; floppy discs, cassette tapes, and the credit card magnetic stripe.

Properties of Ferromagnetic materials

– A ferromagnetic material can generate a very strong magnetic field and is strongly attracted to a magnet.

– A ferromagnet maintains its magnetic property even right after the magnetic field is removed.

– A ferromagnetic material poses a huge number of tiny regions referred to as domains in which the ionic or atomic magnetic moments are allied parallel to one another. As we have learnt during our Physics tuition classes, each of these magnetic moments can also be termed as magnetic dipoles. The magnetic field is robust in this domain. Moments in the material’s various regions could be aligned with a distinct axis or with an exact same axis.

– Generally, ferromagnetic materials become paramagnetic materials (these are materials which doesn’t exhibit any magnetism when the field of magnetism is withdrawn) over a temperature called the Curie temperature. It’s the temperature where the magnetic moments of the atoms’ electrons change their direction.

– When a ferromagnetic material suspended freely in a uniform field of magnetism, it aligns itself to the direction of the magnetic field.

– Ferromagnetic materials have a penetrability of greater than one. It’s the measure of the capability of materials to sustain a magnetic field inside itself.

– A ferromagnetic material is powerfully magnetized in the direction of the applied field of magnetism.

– The magnetic susceptibility (level of magnetization with respect to an applied magnetic field) is excellent. In accordance to the law of Curie-Weiss, magnetic susceptibility decreases if the temperature is elevated. This law states that, over the Curie temperature, ferromagnetic materials change into paramagnetic materials.

– When a ferromagnetic material is magnetized through rising the magnetic field intensity, then the flux variation via the material is not fast, but gradual.

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