Reading Review Notes for Week 14:

• Re-read the notes from last class. 

-What are the majority and minority carriers in each region of a pn junction?

-What causes electron diffusion? electron drift?

-Where does the built in voltage come from and what does it do?

-What happens to the built in voltage and the current across the junction under forward bias?  reverse bias?

• Things to think about

-What devices use forward bias?  What devices use reverse bias?

• Read sections 8.1-8.2

-Do you know B,H, and M differ?

-How are B,H, and m related to current in a solenoid?

-How are m_o, m_r, and X related?

-Describe in words why an orbiting electron has a magnetic moment.

-What is the difference between m_orb and m_spin in terms of what motion in the atom causes them?

-Why do only unfilled subshells contribute to m_atom?

-What is b and why is it a constant?

-Describe the difference between B_o and B.

-Describe the difference between B_o and H.

-Describe the difference between M, B, and H.

-Describe how M is related to the atomic current loops.

-What is magnetic permeability?

-What is magnetic susceptibility?

-Study Example 8.2 and briefly explain how energy/work is used to increase the magnetization.

-What is the difference between diamagnetism and paramagnetism?

-What is the difference between paramagnetism and ferromagnetism?

-What is the Curie temperature?

-What is the difference between ferromagnetism and ferrimagnetism?

-What is the difference between ferrimagnetism and antiferromagnetism?

-What is the Neel temperature?

• Important terms you should know

  -B, H, M

  -magnetic moment

  -Bohr magneton

  -magnetic permeability

  -magnetic susceptibility

  -diamagnetic

  -paramagnetic

  -ferromagnetic

  -antiferromagnetic

  -ferrimagnetic

• Go to the textbook website and check out the web booklets (in the "Selected Topics" section. 
  • Ferrimagnetic materials in engineering