Magnetic Properties of Materials
Subject and UNIT: Physics for Electrical Engineering: Unit II: b. Magnetic Properties of Materials
When a weak magnetic field, such as that from a bit on a hard disk, passes beneath such a structure, the magnetic orientation of the unpinned magnetic layer rotates relative to that of the pinned layer. This generates a significant change in electrical resistance due to the GMR effect.
Description, Working Principle, Definition, Application
Subject and UNIT: Physics for Electrical Engineering: Unit II: b. Magnetic Properties of Materials
SQUID stands for Superconducting QUantum Interference Device. It is an ultra-sensitive instrument used to measure very weak magnetic field of the order of 10-14 tesla.
Magnetic Properties of Materials
Subject and UNIT: Physics for Electrical Engineering: Unit II: b. Magnetic Properties of Materials
The ferromagnetic property is exhibited by transition elements such as iron, cobalt, and nickel at room temperature and rare earth elements like gadolinium and dysprosium.
Magnetic Properties of Materials
Subject and UNIT: Physics for Electrical Engineering: Unit II: b. Magnetic Properties of Materials
Certain metals like iron (Fe), cobalt (Co), nickel (Ni) and certain alloys exhibit high degree of magnetisation.
Magnetic Properties of Materials
Subject and UNIT: Physics for Electrical Engineering: Unit II: b. Magnetic Properties of Materials
According to Langevin's theory the paramagnetic susceptibility is inversely proportional to the temperature. However, some metals have been found to paramagnetism independent of temperature.
Magnetic Properties of Materials
Subject and UNIT: Physics for Electrical Engineering: Unit II: b. Magnetic Properties of Materials
In certain materials, each atom or molecule possesses a net permanent magnetic moment (due to orbital and spin magnetic moments) even in the absence of an external magnetic field.
Magnetic Properties of Materials
Subject and UNIT: Physics for Electrical Engineering: Unit II: b. Magnetic Properties of Materials
As a result, the material becomes magnetised. The direction of the induced dipole moment is opposite to that of externally applied magnetic field.
Subject and UNIT: Physics for Electrical Engineering: Unit II: b. Magnetic Properties of Materials
Magnetic materials are classified into two categories based on existence of dipole moment and the response of magnetic material to external magnetic fields.
Subject and UNIT: Physics for Electrical Engineering: Unit II: b. Magnetic Properties of Materials
A very large number of modern devices depend upon magnetic properties of materials for their working. For example, the speakers, electrical power generators, electrical machines, transformers, television, data storage devices like magnetic tapes and disks, magnetic compass etc.
Electrical Properties of Materials | Physics for Electrical Engineering
Subject and UNIT: Physics for Electrical Engineering: Unit II: a. Electrical Properties of Materials
Physics for Electrical Engineering: Unit II: Electrical and Magnetic Properties of Materials : Assignment Problems
Electrical Properties of Materials | Physics for Electrical Engineering
Subject and UNIT: Physics for Electrical Engineering: Unit II: a. Electrical Properties of Materials
Physics for Electrical Engineering: Unit II: Electrical and Magnetic Properties of Materials : Additional PART B '16' Marks Questions
Electrical Properties of Materials | Physics for Electrical Engineering
Subject and UNIT: Physics for Electrical Engineering: Unit II: a. Electrical Properties of Materials
Physics for Electrical Engineering: Unit II: Electrical and Magnetic Properties of Materials : Part B '16' Marks Questions - Anna University Questions