HCL infosystems interview

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As you are preparing for the placement in a reputed company like HCL then Let us discuss overview of HCL infosystems as it may be beneficial for you in the HCL interview.

HCL infosystem is part of HCL which was founded in 1976. It provides services in Continue reading “HCL infosystems interview”

Effect of temperature on ferromagnetism

As the temperature of the ferromagnetic material is raised, the thermal energy of the atoms increases. At very high temperature, the thermal energy is sufficient to break the domains and ferromagnetic materials become paramagnetic.

Reference: This article is referred from my book “electrical engineering materials” having ISBN 978-81-272-5069-0

Weiss theory of ferromagnetism

To explain the phenomenon of ferromagnetism, Weiss proposed a hypothetical concept of ferromagnetic domains. He postulated that the neighboring atoms of the ferromagnetic materials, due to certain mutual exchange interactions, from several number of very small regions, called domains.

Weiss theory of ferromagnetism is also called domain theory of ferromagnetism. It has following points: Continue reading “Weiss theory of ferromagnetism”

Domain

Domain is a region in a ferromagnetic material where all the magnetic dipole moments are aligned. The domains are of microscopic size of the order of 10-8 to 10-12 m3 and contains about 1015 to 1017 atoms. Each atom of a domain has magnetic moment in the same direction and gives a resultant large magnetic moment to the domain.

Reference: This article is referred from my book “electrical engineering materials” having ISBN 978-81-272-5069-0

10-8 to 10-12 m3

10-8 to 10-12 m3