The angular dependence of the critical current density Jc in external magnetic field has been measured in Nb/CuMn multilayers with and without a regular array of antidots. The multilayers without antidots behave coherently to what has already been reported in the literature, showing, for sufficiently high anisotropy, dissipation related only to the magnetic-field component perpendicular to the layers, H' . This behavior is generally explained in terms of the presence of kinked vortices. The kink formation has been directly detected in the antidotted samples, where low angle modulation of Jc , related to single vortex kinks entering the system, has been found. The presence of kinks explains also the unusual scaling of Jc vs H' found at low anisotropy in the antidotted case up to a value of the angle related to the geometrical structure of the system.
Evidence of vortex kink formation in antidotted layered superconductors
Barbanera S
2003
Abstract
The angular dependence of the critical current density Jc in external magnetic field has been measured in Nb/CuMn multilayers with and without a regular array of antidots. The multilayers without antidots behave coherently to what has already been reported in the literature, showing, for sufficiently high anisotropy, dissipation related only to the magnetic-field component perpendicular to the layers, H' . This behavior is generally explained in terms of the presence of kinked vortices. The kink formation has been directly detected in the antidotted samples, where low angle modulation of Jc , related to single vortex kinks entering the system, has been found. The presence of kinks explains also the unusual scaling of Jc vs H' found at low anisotropy in the antidotted case up to a value of the angle related to the geometrical structure of the system.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
