Low-noise modular microsusceptometer using nearly quantum limited dc SQUIDs
- 21 November 1988
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 53 (21), 2108-2110
- https://doi.org/10.1063/1.100291
Abstract
A flexible combination of superconducting integrated circuits was used to construct a low-temperature magneto-optic microsusceptometer utilizing a dc superconducting quantum inteference device (SQUID) detector operating near the quantum limit (coupled energy sensitivity of 1.7ℏ). Miniature pick-up loop assemblies on transparent substrates were joined by superconducting interchip connections to a thin-film dc SQUID, which is in turn read out by a second dc SQUID connected to room-temperature electronics. Measurements on an 8.5-μm-diam titanium dot evaporated directly into the pick-up loop demonstrate a spin sensitivity of ∼103 spins/(Hz)1/2 at T=290 mK.Keywords
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