[RpL 649] Магнитометр на кинетической индуктивности (из нитрида ниобия)

[Семёнов Александр]

 Высокая кинетическая индуктивность NbN находит себе все новые применения. Финская группа сделала магнитометр на нелинейности кинетической индуктивности пленки NbN, чувствительность которого, как они утверждают, может быть доведена до уровня не ниже, чем у сквида.

(Оперативная информация поступила от М.Ю. Куприянова)

Kinetic Inductance Magnetometer
Juho Luomahaara, Visa Vesterinen, Leif Grönberg, Juha Hassel

http://arxiv.org/pdf/1401.0668.pdf
Abstract
Ultrasensitive magnetic 
eld detection is utilized in the 
elds of science, medicine and industry.
We report on a novel magnetometer relying on the kinetic inductance of superconducting material.
The kinetic inductance exhibits a non-linear response with respect to DC current, a fact that
is exploited by applying magnetic ux through a superconducting loop to generate a shielding
current and a change in the inductance of the loop. The magnetometer is arranged into a resonator,
allowing readout through a transmission measurement that makes the device compatible with radio
frequency multiplexing techniques. The device is fabricated using a single thin-
lm layer of NbN,
simplifying the fabrication process compared to existing magnetometer technologies considerably.
Our experimental data, supported by theory, demonstrates a magnetometer having potential to
replace established technology in applications requiring ultra-high sensitivity.