Linear magnetic flux amplifier

Details Linear magnetic flux amplifier Linear magnetic flux amplifier

2005-09-13

arxiv.org/abs/cond-mat/0509332v1

Physics

Condensed Matter

Superconductivity

to appear in Applied Physics Letters

Scientific paper

10.1063/1.2077855

By measuring the critical current versus the applied magnetic field $I_c(\Phi)$ of an Al superconducting loop enclosing a soft Permalloy magnetic dot, we demonstrate that it is feasible to design a linear magnetic flux amplifier for applications in superconducting quantum interference devices. The selected dimensions of a single-domain Permalloy dot provide that the preferential orientation of the magnetization is rotated from the perpendicular direction. By increasing an applied magnetic field, the magnetization of the dot coherently rotates towards the out-of-plane direction, thus providing a flux gain and an enhancement of the sensitivity. As a result of a pronounced shape anisotropy, the flux gain generated by the dot can be tuned by adjusting the dimensions of the dot.

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