What is the magnetic flux quantum?
The magnetic flux quantum is Φ_0 = 2.067833848e-15 Wb, exact by SI definition. It equals h/(2e).
Open the interactive PhysRef tool →Key facts
| Value | 2.067833848e-15 Wb |
|---|---|
| Symbol | Φ_0 |
| Relation | Φ_0 = h/(2e) |
| Exactness | Exact by SI definition (uncertainty 0) |
| Source | CODATA 2018 |
Frequently asked questions
What is the value of the magnetic flux quantum?
Φ_0 = 2.067833848e-15 Wb, the smallest unit of magnetic flux through a superconducting loop.
Where is the flux quantum used?
In superconductivity and SQUID magnetometers, where flux through a loop is quantized in units of Φ_0.
How is Φ_0 defined?
Φ_0 = h/(2e), where the factor of 2 reflects Cooper pairs in superconductors.
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