Electromagnet with high remanence

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Discussion Overview

The discussion centers around the search for an electromagnet that exhibits high magnetic remanence, allowing it to retain magnetism even when the current is turned off. Participants explore the requirements for size and field strength, as well as potential combinations with permanent magnets.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant seeks information on materials for an electromagnet with high remanence.
  • Another participant inquires about the desired size and field strength of the electromagnet and suggests combining it with a permanent magnet.
  • The original poster clarifies that they do not have specific size or strength numbers but prefers a smaller electromagnet that can interact with a permanent magnet.
  • A participant challenges the size requirement, questioning the feasibility of very small electromagnets and noting that engineering problems vary significantly with scale.
  • The original poster responds that they are looking for a magnet size of a few millimeters (10-20 mm), not micrometer-sized magnets.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the specific requirements for the electromagnet, particularly regarding size and the feasibility of high remanence in smaller designs. Multiple viewpoints on size and application remain present.

Contextual Notes

The discussion lacks specific definitions of "high remanence" and does not clarify the exact application or operational conditions for the electromagnet, which may affect the feasibility of proposed solutions.

Who May Find This Useful

Individuals interested in electromagnet design, materials science, and applications involving magnetic fields may find this discussion relevant.

ashare
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I am in search of an electromagnet which has high magnetic remanence (or retentivity) even when the current through the electromagnet is zero. Can someone provide information about such a material?
 
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Which size and field strength are you looking for?
What about combining a permanent magnet with an electromagnet?
 
At the moment, I don't have a specific number to give you regarding the size and strength. The smaller the better. This electromagnet will be interacting with the field of another permanent magnet which will be attached to another structure. My requirement is to alter the field of the electromagnet by varying the current through it. However, I want the electromagnet to maintain the magnetism even after I remove the electric current.
 
ashare said:
The smaller the better.
Really? Do you want micrometer-sized electromagnets?

Engineering problems depend on the scale. If you want to do something with a size of a few micrometers, it will look completely different from huge electromagnets with a size of a meter or more. Currently there is no scale given at all.
 
I understand. I am not looking for a micrometer scale magnet. A few millimiter (10-20 mm) should be good enough.
 

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