I Why is hysteresis loss proportional to area hysteresis loop ?

AI Thread Summary
Hysteresis loss generates heat due to the work required to change the magnetization of a material, which is represented by the area under the hysteresis loop. The horizontal axis of the loop represents the magnetic field strength (H), while the vertical axis represents magnetic flux density (B). The area of the loop correlates with the energy lost as heat during the magnetization process. This phenomenon occurs because it is energetically favorable for electron spins in ferromagnetic materials to align in one direction, creating an energy gap between magnetized and unmagnetized states. Thus, the heat produced is directly proportional to the area of the hysteresis loop.
fxdung
Messages
387
Reaction score
23
Why does hysteresis loss cause heat and why the heat proportional the area of hysteresis loop?
 
Physics news on Phys.org
Perhaps you can tell us what loop you are talking about: what's on the horizontal axis and what's on the vertical axis ? So what's the dimension of the area ?
 
  • Like
Likes Dale and vanhees71
The horizontal axis is H and the vertical axis is B
 
Ferromagnetism occurs when it is energetically favorable that the spins of the electrons in the material are ordered in one direction and there's an "energy gap" between this magnetized state and the unmagnetized state. The microscopic reason that this happens in some few materials is quantum-mechanical. On the macroscopic level it's sufficient to know that this energy argument holds. This, however implies that to change the magnetization you need to do work to redirect the spins, and the change of energy is given by ##\int \mathrm{d} H B##, i.e., the area under the hysteresis curve.
 
  • Like
  • Informative
Likes cabraham, fxdung and anorlunda

Thread 'The Effect of Linear and Rotational Motion on Measured Weight'

Consider an extremely long and perfectly calibrated scale. A car with a mass of 1000 kg is placed on it, and the scale registers this weight accurately. Now, suppose the car begins to move, reaching very high speeds. Neglecting air resistance and rolling friction, if the car attains, for example, a velocity of 500 km/h, will the scale still indicate a weight corresponding to 1000 kg, or will the measured value decrease as a result of the motion? In a second scenario, imagine a person with a...
View full post »

Thread 'Coulomb gauge implies instantaneous radial electric field?'

Scalar and vector potentials in Coulomb gauge Assume Coulomb gauge so that $$\nabla \cdot \mathbf{A}=0.\tag{1}$$ The scalar potential ##\phi## is described by Poisson's equation $$\nabla^2 \phi = -\frac{\rho}{\varepsilon_0}\tag{2}$$ which has the instantaneous general solution given by $$\phi(\mathbf{r},t)=\frac{1}{4\pi\varepsilon_0}\int \frac{\rho(\mathbf{r}',t)}{|\mathbf{r}-\mathbf{r}'|}d^3r'.\tag{3}$$ In Coulomb gauge the vector potential ##\mathbf{A}## is given by...
View full post »

Thread 'Simple thought experiment with Stefan-Boltzmann law: energy'

Dear all, in an encounter of an infamous claim by Gerlich and Tscheuschner that the Greenhouse effect is inconsistent with the 2nd law of thermodynamics I came to a simple thought experiment which I wanted to share with you to check my understanding and brush up my knowledge. The thought experiment I tried to calculate through is as follows. I have a sphere (1) with radius ##r##, acting like a black body at a temperature of exactly ##T_1 = 500 K##. With Stefan-Boltzmann you can calculate...
View full post »

Similar threads

I I would like a better understanding of friction and hysteresis
Replies
5
Views
2K
A/m Hysteresis Loop: Wide vs Narrow Differences & Importance
Replies
2
Views
4K
Orientation of the Ferroelectric Hysteresis Loop -- Why is it different now?
Replies
4
Views
2K
I Lab experiment: hysteresis disappears, reappears and then disappears again. How?
Replies
1
Views
2K
Analyzing Hysteresis Curve Fitting: Overfitting or Not?
Replies
9
Views
4K
Transformer frequency contradiction on induction heating
Replies
3
Views
1K
Magnetisation in Ferromagnets: Understanding Hysteresis Loop
Replies
2
Views
6K
Frequency appears to have to effect on hysteresis
Replies
15
Views
3K
Issues with SLS Model for Rubber and Foam Compression Tests
Replies
5
Views
785
I How to Calculate the Area of Hysteresis?
Replies
26
Views
11K

Hot Threads

Recent Insights

Back
Top