II. Applications of the Josephson Effect
II. Applications of the Josephson Effect
II. Applications of the Josephson Effect
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R. Gross, A. Marx, and F. Deppe © Wal<strong>the</strong>r-Meißner-Institut (2001 - 2013)<br />
4.1.4 Practical dc-SQUIDs<br />
AS-Chap. 4 - 25<br />
• loop currents around inner opening defines L = 1.25 ¹ 0 D (for W À D)<br />
effective area: A eff / D¢W<br />
• limit: flux trapping in washer area flux noise by <strong>the</strong>rmally activated motion<br />
• flux focusing effect in washer-type YBCO grain boundary junction dc SQUID<br />
M.B. Ketchen et al.,<br />
Appl. Phys. Lett. 40, 736 (1982)<br />
R. Gross et al.,<br />
Appl. Phys. Lett. 57, 727 (1990)
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