Continuously tuneable critical current in superconductor-ferromagnet multilayers
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We demonstrate that the critical current of superconducting Nb/Ni multilayers can be continuously tuned by up to a factor of three during magnetization reversal of the Ni films under an applied in-plane magnetic field. Our observations are in reasonably good agreement with a model of vortex pinning by Bloch domain walls that proliferate in the samples during magnetization reversal, whereby each vortex interacts with at most one wall in any of the Ni layers. Our model suggests ways in which the controllable pinning effect could be significantly enhanced, with important potential applications in tuneable superconducting devices.
Curran , P J , Kim , J , Satchell , N , Witt , J D S , Burnell , G , Flokstra , M G , Lee , S L & Bending , S J 2017 , ' Continuously tuneable critical current in superconductor-ferromagnet multilayers ' Applied Physics Letters , vol 110 , no. 26 , 262601 . DOI: 10.1063/1.4989693
Applied Physics Letters
© 2017, AIP Publishing. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at aip.scitation.org / http://doi.org/10.1063/1.4989693
The authors acknowledge financial support from EPSRC, UK, under Grant Nos. EP/G036101/1, EP/J010626/1, EP/J010634/1, EP/J01060X/1, and EP/I031014/1; the NanoSC COST Action MP-1201; a JEOL Europe studentship under Grant No. EP/I000933/1, plus support from the STFC ISIS neutron and muon source.
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