Spontaneous supercurrent induced by ferromagnetic pi junctions.
Phys Rev Lett
; 92(21): 217001, 2004 May 28.
Article
en En
| MEDLINE
| ID: mdl-15245309
ABSTRACT
We present magnetization measurements of mesoscopic superconducting niobium loops containing a ferromagnetic (PdNi) pi junction. The loops are prepared on top of the active area of a micro-Hall sensor based on high mobility GaAs/AlGaAs heterostructures. We observe asymmetric switching of the loop between different magnetization states when reversing the sweep direction of the magnetic field. This provides evidence for a spontaneous current induced by the intrinsic phase shift of the pi junction. In addition, the presence of the spontaneous current near zero applied field is directly revealed by an increase of the magnetic moment with decreasing temperature, which results in half integer flux quantization in the loop at low temperatures.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Año:
2004
Tipo del documento:
Article
País de afiliación:
Alemania