Development of an Array of Kinetic Inductance Magnetometers (KIMs)

Sasha Sypkens, Farzad Faramarzi, Marco Colangelo, Adrian Sinclair, Ryan Stephenson, Jacob Glasby, Peter Day, Karl Berggren, Philip Mauskopf

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We describe optimization of a cryogenic magnetometer that uses nonlinear kinetic inductance in superconducting nanowires as the sensitive element instead of a superconducting quantum interference device (SQUID). The circuit design consists of a loop geometry with two nanowires in parallel, serving as the inductive section of a lumped LC resonator similar to a kinetic inductance detector (KID). This device takes advantage of the multiplexing capability of the KID, allowing for a natural frequency multiplexed readout. The Kinetic Inductance Magnetometer (KIM) is biased with a DC magnetic flux through the inductive loop. A perturbing signal will cause a flux change through the loop, and thus a change in the induced current, which alters the kinetic inductance of the nanowires, causing the resonant frequency of the KIM to shift. This technology has applications in astrophysics, material science, and the medical field for readout of Metallic Magnetic Calorimeters (MMCs), axion detection, and magnetoencephalography (MEG).

Original languageEnglish (US)
Article number9345515
JournalIEEE Transactions on Applied Superconductivity
Issue number5
StatePublished - Aug 2021


  • E-beam lithography
  • Kinetic inductance
  • frequency multiplexing
  • magnetometer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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