Flux Pinning in a type 2 SC Using an AC Electromagnet

In summary, when a supercooled type two superconductor is exposed to a static magnetic field, it becomes pinned to the flux of the field, resulting in the mixed-state Meissner effect. If the magnetic field is continuously changing, the superconductor's superconductivity will only occur after the field has already passed through, resulting in a stronger pinning force with DC current. If the changing field is not sinusoidal and only changes slightly without reaching 0v, it can be treated as a DC field at every time. The term "supercooled" in this context refers to the superconducting state, not water vapor.
  • #1
AniV
15
1
When a supercooled type two superconductor is subjected to a static magnetic field, the superconductor pins to the flux of the field (the mixed-state meissner effect is apparent).

What happens if it is subjected to a continuously changing magnetic field, assuming the superconductivity takes place after the field is introduced (flux already passed through before the superconductor became superconducting, which with DC current would result in a stronger pinning force)?

What would happen if the changing field is not sinusoidal, only changing slightly without ever reaching 0v?
 
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  • #2
What do you mean by supercooled (which applies to water vapor)? I assume you just mean that it's superconducting? If the field strength changes slowly enough, then you can treat it as though it is a DC field at every time.
 

1. What is flux pinning in a type 2 superconductor?

Flux pinning in a type 2 superconductor refers to the phenomenon where magnetic flux lines become trapped in the material, causing it to exhibit superconducting properties even in the presence of a magnetic field.

2. How does an AC electromagnet affect flux pinning in a type 2 superconductor?

An AC electromagnet produces a constantly changing magnetic field, which can induce currents in the type 2 superconductor. These induced currents can create magnetic fields that oppose the external field, further enhancing the flux pinning effect.

3. What are the practical applications of flux pinning in a type 2 superconductor?

Flux pinning in type 2 superconductors has various applications, including levitation in Maglev trains, high-speed motors, and MRI machines. It also allows for the creation of more efficient energy storage devices.

4. How is flux pinning studied in a type 2 superconductor using an AC electromagnet?

To study flux pinning, scientists typically apply an AC magnetic field to the type 2 superconductor and measure the changes in its electrical resistance. They can also observe the movement of the trapped magnetic flux lines using special imaging techniques.

5. What are the challenges in utilizing flux pinning in type 2 superconductors for practical applications?

One of the main challenges is to find ways to control and manipulate the trapped flux lines to achieve desired effects. Another challenge is to develop materials that can maintain their superconducting properties at high temperatures and with high magnetic fields, as most type 2 superconductors have lower critical temperatures and fields compared to type 1 superconductors.

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