What Makes Iron Ferromagnetic?

  • Context: Undergrad 
  • Thread starter Thread starter wdlang
  • Start date Start date
  • Tags Tags
    Iron
Click For Summary
SUMMARY

Iron exhibits ferromagnetic properties due to the alignment of electron spins, which lowers exchange energy despite increasing kinetic energy. The narrow bands of 3d electrons in iron, resulting from localized 3d orbitals with minimal overlap between neighboring atoms, contribute to this phenomenon. Ferromagnetism is characterized by substances that have relative permeabilities significantly greater than one and can retain magnetization without an external field.

PREREQUISITES
  • Understanding of electron spin and its role in magnetism
  • Knowledge of exchange energy and kinetic energy concepts
  • Familiarity with atomic orbitals, specifically 3d orbitals
  • Basic principles of magnetism and magnetic domains
NEXT STEPS
  • Research the concept of magnetic domains and their role in ferromagnetism
  • Study the properties of 3d electrons in transition metals
  • Explore the relationship between electron spin alignment and magnetic permeability
  • Investigate models of ferromagnetism and their applications in materials science
USEFUL FOR

Students of physics, materials scientists, and anyone interested in the fundamental principles of magnetism and the behavior of ferromagnetic materials like iron.

wdlang
Messages
306
Reaction score
0
is this basic fact understood?
 
Physics news on Phys.org
Yes. This is because the exchange energy goes down by having spins align. But having spins aligned generally results in an increase in kinetic energy. That's true for any material. But for iron, the increase in kinetic energy is smaller than the decrease in exchange energy. This is because the bands for the 3d electrons in iron are narrow. They are narrow because 3d orbitals are fairly localized and 3d orbitals on neighboring atoms don't have much overlap.

You can get more or less sophisticated and/or convoluted answers from more or less sophisticated models.
 
First, we must know the meaning of the term "FERROMAGNETIC"
Ferromagnetic is the phenomenon exhibited by substances, such as iron, that have relative permeabilities much greater than unity and increasing magnetization with applied magnetizing field. Certain of these substances retain their magnetization in the absence of the applied field. The effect is caused by the alignment of electron spin in regions called domains
 

Similar threads

Undergrad Questions about Curie Temperature Characteristics
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Broken symmetry in ferromagnetism
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Structural difference between soft and hard ferromagnets
  • · Replies 4 ·
Replies
4
Views
2K
High School Why can't we use an iron bar as magnet
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Calculating Potential Energy of Iron Slab in Ferro/Anti-Ferro Magnetic States
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Why are there not more ferromagnetic Materials?
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Ferromagnetism versus Paramagnetism
  • · Replies 27 ·
Replies
27
Views
19K
History Where did ancient civilizations get their supply of iron?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad What are the possible states of cold iron balls?
  • · Replies 2 ·
Replies
2
Views
3K
Iron (nickel plated) -- what is it?
  • · Replies 7 ·
Replies
7
Views
4K