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SQUID magnetometer operating at 37 K based on nanobridges in epitaxial thin films
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View: Figures


Image of FIG. 1.
FIG. 1.

Voltage modulation of a SQUID vs applied magnetic field at 37 K for different values of the bias current.

Image of FIG. 2.
FIG. 2.

The design of an inductively shunted magnetometer. (a) The design of the whole magnetometer with a magnification of the striplines; (b) including their dimensions and position of the nanobridges. denotes the screening current, i.e., the current induced by the applied magnetic field.

Image of FIG. 3.
FIG. 3.

Effective magnetometer area as function of temperature. The solid line is the theoretical expectation for when using a two-band model for the penetration depth in the clean limit for transport in the crystallographic plane, with . The dotted line is the theoretical expectation when using a BCS model for the penetration depth and . The inset shows the maximum voltage modulation as a function of temperature.

Image of FIG. 4.
FIG. 4.

Temperature dependence of the critical current in a nanobridge of 100 nm width (∎), scaled up by a factor of 4, and 140 nm width (엯). The solid line shows the (nonmonotonous) fit of a two-band model.

Image of FIG. 5.
FIG. 5.

Flux noise spectrum of the magnetometer at 35 K.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: SQUID magnetometer operating at 37 K based on nanobridges in epitaxial MgB2 thin films