Modeling the trapped field distribution in a polycrystalline bulk superconductor based on a critical state model

Modeling of vortex dynamics in HTSs with defects under the impact of pulsed magnetic field

“…In superconducting bridges [34], with the simultaneous presence of transport current and magnetic field, various vortex regimes have been observed, including the so-called kinematic vortices (vortex-antivortex pairs) appearing at currents exceeding the decoupling current. In the case considered in our paper (and in [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]), when a type-II superconductor much larger than λ is placed in an external magnetic field (much less than the upper critical field), the Abrikosov vortices are observed. These are long thin cylinders of normal phase of radius ∼ ξ encircled by a supercurrent flowing at a distance ∼ λ and carrying a single quantum of magnetic flux Φ 0 .…”

“…When switching to an ensemble of N vortices, one needs to consider the images r img j of each vortex in the sample. The contribution of the h img component will thus have the form of (7).…”

“…The interest in studying the magnetic properties of hightemperature superconductors (HTSs) is growing every year. Numerous studies have shown that bulk superconductors and stacks of HTS tapes are capable of trapping magnetic fields of several teslas or higher and can therefore be used as pseudopermanent trapped field magnets (TFMs) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The range of potential practical applications of such magnets extends from magnetic bearings and levitation devices to motors and highfield magnets [1,2,16,[19][20][21][22][23].…”