{"id":279,"date":"2018-07-18T16:27:25","date_gmt":"2018-07-18T16:27:25","guid":{"rendered":"https:\/\/web.stanford.edu\/group\/moler\/cgi-bin\/home\/?page_id=279"},"modified":"2018-12-13T00:39:12","modified_gmt":"2018-12-13T00:39:12","slug":"sensor-development","status":"publish","type":"page","link":"https:\/\/web.stanford.edu\/group\/moler\/cgi-bin\/home\/research\/sensor-development\/","title":{"rendered":"Sensor Development"},"content":{"rendered":"

In a collaboration with IBM, and funded by an NSF Instrumentation for Materials Research\u2013Major Instrumentation Projects (IMR-MIP) grant, the Moler group has developed 3 next generation SQUID microscope sensors.<\/h3>\n
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Scanning SQUID susceptometers with sub-micron spatial resolution<\/h2>\n

The first, shown below, is a scanning SQUID susceptometer. Our susceptometers have a shielded gradiometric geometry with on-chip field coils. This design enables simultaneous local measurement of magnetic flux and magnetic susceptibility.<\/p>\n\n\n

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a) Schematic, b) Layout of the entire sensor chip, c) 3D rendering of the pickup loop\/field coil region, and d) Calculated sensitivity profile of the sensor. <\/figcaption><\/figure><\/div>\n\n\n\n

A description of first results from this sensor have appeared in J.R. Kirtley et al., \u201cScanning SQUID susceptometers with sub-micron spatial resolution<\/strong>\u201d, Rev. Sci. Instrum. 87, 093702 (2016)<\/a>.
<\/p>\n\n\n

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Scanning SQUID susceptometers with dispersive readout<\/h2>\n\n\n

The Moler group, in collaboration with Hendrik Bluhm\u2019s group at RWTH Aachen<\/a> in Germany and IBM, has developed a new kind of scanning SQUID susceptometer, which senses magnetic fields through changes in the resonance frequency of the device.<\/p>\n\n\n\n

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a) Schematic, b) Full layout of the sensor, c) Layout of the pickup loop\/field coil region, and d) Resonant frequency vs. applied flux for one such device.<\/figcaption><\/figure><\/div>\n\n\n\n

First results from these sensors haveappeared in F. Fouroughi et al., \u201cA micro-SQUID with dispersive readout for magnetic scanning microscopy<\/strong>\u201d, Appl. Phys. Lett.112, 252601 (2018)<\/a>. <\/p>\n\n\n

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Scanning SQUID samplers<\/h2>\n

In collaboration with IBM we have also developed scanning SQUID samplers, capable of measuring periodic magnetic signals on micron length-scales with demonstrated 40 ps time resolution.<\/p>\n\n\n

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a) Schematic b) Full chip layout, c) Layout of the active region of the sensor, d) Simulation of the ultimate time resolution of this sensor.<\/figcaption><\/figure><\/div>\n\n\n

First results from this sensor have been published in Zheng Cui et al., \u201cScanning SQUID sampler with 40-ps time resolution<\/strong>\u201d, Rev. Sci. Instrum. 88, 085106 (2017)<\/a>.<\/p>\n

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The Moler group SQUID sensors have been used to measure the vibrations between sample and sensor in a SQUID microscope. This work was published in Daniel Schiessl et al., \u201cDetermining the vibrations between sensor and sample in SQUID microscopy<\/strong>\u201d, Appl. Phys. Lett. 109, 232601 (2016)<\/a>.<\/p>\n\n\n

\"\"<\/figure><\/div>\n","protected":false},"excerpt":{"rendered":"

In a collaboration with IBM, and funded by an NSF Instrumentation for Materials Research\u2013Major Instrumentation Projects (IMR-MIP) grant, the Moler group has developed 3 next generation SQUID microscope sensors. Scanning SQUID susceptometers with sub-micron spatial resolution The first, shown below, is a scanning SQUID susceptometer. Our susceptometers have a shielded gradiometric geometry with on-chip field […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":127,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/web.stanford.edu\/group\/moler\/cgi-bin\/home\/wp-json\/wp\/v2\/pages\/279"}],"collection":[{"href":"https:\/\/web.stanford.edu\/group\/moler\/cgi-bin\/home\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/web.stanford.edu\/group\/moler\/cgi-bin\/home\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/web.stanford.edu\/group\/moler\/cgi-bin\/home\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/web.stanford.edu\/group\/moler\/cgi-bin\/home\/wp-json\/wp\/v2\/comments?post=279"}],"version-history":[{"count":16,"href":"https:\/\/web.stanford.edu\/group\/moler\/cgi-bin\/home\/wp-json\/wp\/v2\/pages\/279\/revisions"}],"predecessor-version":[{"id":874,"href":"https:\/\/web.stanford.edu\/group\/moler\/cgi-bin\/home\/wp-json\/wp\/v2\/pages\/279\/revisions\/874"}],"up":[{"embeddable":true,"href":"https:\/\/web.stanford.edu\/group\/moler\/cgi-bin\/home\/wp-json\/wp\/v2\/pages\/127"}],"wp:attachment":[{"href":"https:\/\/web.stanford.edu\/group\/moler\/cgi-bin\/home\/wp-json\/wp\/v2\/media?parent=279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}