Fundamentals of magnetism

• Diamagnetism

• Paramagnetism

• Ferromagnetism

• Antiferromagnetism

Diamagnetism

• Due to Faraday’s law

AdB

dt

dE

B

B

Paramagnetism

T

CH

M

T

C

Ferromagnetism

Antiferromagnetism

Hysteresis

Magnetic domains

To minimized the magnetostatic energy

32

02

1dxBU

Magnetic Force Microscope (MFM)

Home workdue 12/31/2005

1. Briefly describe the phenomena of diamagnetism, paramagnetism, ferromagnetism, and ferromagnetism. (40%)

2. Why are magnetic domains formed? (20%)

3. Due to which breakthrough does the memory capacity of the hard disks increase so rapidly? (20%)

4. List two possible applications of magnetic nanoparticles. (20%)