Superconducting quantum interference device based on MgB[sub 2] nanobridges

Brinkman, Alexander; Veldhuis, Dick; Mijatovic, Dragana; Rijnders, Guus; Blank, Dave H. A.; Hilgenkamp, Hans; Rogalla, Horst
October 2001
Applied Physics Letters;10/8/2001, Vol. 79 Issue 15, p2420
Academic Journal
The superconductor MgB[sub 2], with a transition temperature of 39 K, has significant potential for future electronics. An essential step is the achievement of Josephson circuits, of which the superconducting quantum interference device (SQUID) is the most important. Here, we report Josephson quantum interference in superconducting MgB[sub 2] thin films. Modulation voltages of up to 30 μV are observed in an all-MgB[sub 2] SQUID, based on focused-ion-beam patterned nanobridges. These bridges, with a length scale <100 nm, have outstanding critical current densities of 7×10[sup 6] A/cm[sup 2] at 4.2 K. © 2001 American Institute of Physics.


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