Application of Magnetic Materiel. Md Nafiz Hossain Department of Civil Engineering Daffodil International University Contract No : +8801724622582

1. BATCH - 5
PHY – 103
GROUP –3
172-DAY(DD1)

2. Welcome To Our Presentation
Submitted to :
Department of Civil Engineering
Daffodil International University
Presented By :
Md Nafiz Hossain 172-47-425

3. Topic : Application Of Magnetic materials
Contents :
• Introduction
• Terms connected with magnetic materials
• Classification with Properties
• Hysteresis
• Applications

4. Introduction
• Materials which are magnetised by the application
of an external magnetic field are known as magnetic
materials.
• Such materials when magnetized, create a
magnetic field in the surrounding space.

5. Terms connected with magnetic materials
• Magnetic force
• Magnetic flux density
• Magnetic field strength
• Relative permeability
• Absolute permeability
• Retentivity
• Curie temperature (Tc)
• Hysteresis loop & losses

6. Classification
• Diamagnetic
• Paramagnetic
• Ferromagnetic
• Antiferromagnetic
• Ferrimagnetic
• Magnetically Soft material
• Magnetically Hard material

7. Diamagnetic :
• It is a substance which create a magnetic field
in opposite to an externally applied field.
• Susceptibility is negative.
• These have relative permeability slightly less
than unity.
• They reppel the lines of force slightly.
• The examples are bismuth silver, copper
and hydrogen.

8. Paramagnetic :
• It is a substance or body which very weakly
attracted by the poles of a magnet, but not
retaining any permanent magnetism.
• These have relative permeability slightly
greater than unity and are magnetized
slightly.
• They attract the lines of forces weakly.
• Al, Pt, Ca, O2 are such materials.

9. Ferromagnetic:
• A type of material that is highly attracted to magnets
and can become permanently magnetized is called as
ferromagnetic.
• The relative permeability is much greater than unity and
are dependent on the field
strength.
• These have high susceptibility.
Fe, Co, Ni, Cr, Mn are such materials.

10. Antiferromagnetism :
the magnetic moments of atoms or
molecules, usually related to the spins
of electrons, align in a regular pattern
with neighboring spins (on different
sub lattices) pointing in opposite
directions.

11. Ferrimagnetism :
Ferrimagnetic material is one in which the
magnetic moment of the atoms on different
sublattices are opposed, as in
antiferromagnetism; however, in
ferrimagnetic materials, the opposing
moments are unequal and a spontaneous
magnetization remains.

12. Magnetically Soft Material :
• Characteristics :
1. They have high permeability.
2. The magnetic energy stored is not high.
3. They have negligible coercive force.
4. They have low remanence.
5. Hysteresis loop is narrow.
• Examples :
pure or ingot iron, cast iron, carbon steel, manganese & nickel steel, etc.

13. Magnetically Hard Material :
• Characteristics :
1. They possess high value of BH product.
2. High retentivity.
3. High coercivity.
4. Strong magnetic reluctance.
5. Hysteresis loop is more rectangular in shape.
• Examples :
Tungsten steel, cobalt steel, chromium steel, etc.

14. Hysteresis :
hysteresis in a ferromagnetic material;
the lag in the response of
magnetic induction to changes of
magnetic intensity.

15. Applications :
• Ferromagnetic materials are used in magnetic recording devices, such as for
cassette tapes, floppy discs for computers, and the magnetic stripe on the
back of credit cards.
• Diamagnetic materials are used for magnetic levitation, where an object
will be made to float in are above a strong magnet.
• Magnetic soft materials are used in making electromagnets and these
electromagnets are used in telephone receiver, bells, loud speakers etc.
• Magnetic hard materials are used in making permanent magnets.

16. Any Question ?

17. THANK YOU