Relationship between remanence (B_r) and Magnetization (M)

In summary, the conversation discusses the relationship between remanence field and magnetization for NdFeB magnets and the difficulty in finding a linear relationship due to unknown factors such as χm and the shape of the magnet. The speaker also clarifies that magnetization is not the same as remanence, which is often mistakenly referred to on websites.
  • #1
sgsawant
30
0
Hi,

I have scoured through scores of websites but haven't found a reasonable solution. The thought problem goes like this. Take any NdFeB magnet which is saturated say to B_r =1.3 T. Is there a magnetization (M) value that corresponds to the this remanence. I have been able to find a few relations but then in the end I am still left with unknowns. For example χm (perhaps read as "Ki"). And even those are not easy to find for materials like NdFeB.

So the question is, is there a linear relationship between remanent field and magnetization? Many websites refer to magnetization as if it is the same as remanence. That I know for sure it is not.

Regards,

-sgsawant
 
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  • #2
If the magnet has a closed shape, like a torus, then the remanence field Br equals mu0 times the magnetization because the H field is null. In an open magnet the B field is less than Br.
 

FAQ: Relationship between remanence (B_r) and Magnetization (M)

What is the relationship between remanence and magnetization?

The relationship between remanence and magnetization is that remanence (B_r) is the measure of a material's magnetic field strength in the absence of an external field, while magnetization (M) is the measure of a material's magnetic moment per unit volume when an external magnetic field is applied. This means that remanence is a property of the material, while magnetization is a result of the material's interaction with an external magnetic field.

How does remanence affect the strength of a magnet?

Remanence has a direct effect on the strength of a magnet. A material with a higher remanence value will have a stronger magnetic field and therefore a stronger overall magnet. This is because the higher remanence indicates a greater ability for the material to retain its magnetization, resulting in a stronger magnetic field.

Can remanence and magnetization be altered?

Yes, both remanence and magnetization can be altered through various methods. For example, heating a magnet to a specific temperature can change its remanence, while applying an external magnetic field can change its magnetization. Additionally, the chemical composition and microstructure of the material can also affect these properties.

What is the significance of the relationship between remanence and magnetization?

The relationship between remanence and magnetization is significant because it helps us understand the behavior of magnetic materials. By studying the changes in remanence and magnetization, we can gain insights into how these materials can be used in various applications, such as in magnetic storage devices or in motors and generators.

How is the relationship between remanence and magnetization represented graphically?

The relationship between remanence and magnetization is typically represented graphically by a hysteresis curve. This curve shows the relationship between the two properties as an external magnetic field is applied and then removed. The area within the hysteresis curve represents the energy that is required to magnetize and demagnetize the material, and the shape of the curve can provide information about the material's magnetic properties.

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