Abstract
The properties of the two-layer magnetically coupled long Josephson junction stacks are investigated theoretically. An expression for the Swihart velocities\(\bar c_ + \) and\(\bar c_ - \) is given for the case of different junction parameters. It is predicted that for asymmetric stack the first critical fieldH c1 is represented by two valuesH ↑ c1 andH ↓ c1 different from the fieldsH A c1 andH B c1 that characterize separate junctions. A calculation of the first critical fieldH ↑ c1 as a function of the junction parameters is made for the case of small difference in effective magnetic field penetration depths of the junctions.
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