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Vortex matter in a hybrid superconducting/ferromagnetic nanostructure

机译：超导/铁磁混合纳米结构中的涡旋物质

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摘要

By using a gauge transformation of the vector potential that accounts for the superconducting/vacuum boundary condition, we solve the linear and nonlinear Ginzburg-Landau equations to calculate the phase diagram of the hybrid superconducting/ferromagnetic nanostructure formed by a superconducting microsquare with a magnetic disk on top. Close to the normal/superconducting phase boundary [T_c(H)] we observe that the competition between the applied magnetic field and the inhomogeneous field of the disk strongly affects the vortex nucleation. As a consequence, different symmetry constraints are imposed on the vortex patterns at T_c(H), leading to the exclusion of some vorticity values allowed in the no-dot case. The dot also influences the evolution with temperature of the vortex states deep in the superconducting phase, giving rise to instability processes that differ from those previously found in individual microsuperconductors and that may involve the spontaneous generation of additional vortices. Besides, the dot also forces the vortex matter in this hybrid nanostructure to behave similarly to the case of an individual microdisk in some regions of the phase diagram.
机译：通过使用考虑超导/真空边界条件的矢量电势的量规变换，我们求解线性和非线性Ginzburg-Landau方程，以计算由具有磁盘的超导微方块形成的混合超导/铁磁纳米结构的相图在上面。接近常态/超导相边界[T_c（H）]，我们观察到施加的磁场与磁盘的不均匀磁场之间的竞争会强烈影响涡旋形核。结果，在T_c（H）处的涡旋图上施加了不同的对称性约束，导致排除了无点情况下允许的某些涡度值。该点还会影响超导相深处涡旋状态随温度的演化，从而导致不稳定过程不同于先前在单个微超导体中发现的过程，并且可能涉及自发产生额外的涡旋。此外，在相图的某些区域，点还迫使该杂化纳米结构中的涡旋物质的行为类似于单个微盘的情况。

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