Transport Properties of NbN Thin Films Patterned With a Focused Helium Ion Beam

Li, Hao; Cai, Han; Forman, Joseph; Cheng, Ran; Hughes, George W.; Walker, Harrison; Hamilton, Michael C.; Chen, Lei; Zhang, Weijun; You, Lixing; Cybart, Shane A.

doi:10.1109/tasc.2023.3248530

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…[24] Furthermore, experiments and theories have pointed out that some crucial parameters can control the skewness of CPR, such as gate voltage, [25] thickness of ferromagnet layer, [26,27] magnetic field, [15,28] temperature, and power of radiation. [29] Recently, a state-of-the-art technology-focused He ion beam irradiation (He-FIB) has been used to fabricate high quality Josephson junctions in various superconducting materials, including YBa 2 Cu 3 O 7−δ , [30,31] MgB 2 , [32] Bi 2 Sr 2 CaCu 2 O 8+x , [33] NbN, [34] NbTiN, [35] and Co-doped BaFe 2 As 2 , [36] which shows a great potential in applied and basic scientific research. In this work, MgB 2 He-FIB Josephson junctions of different irradiation doses and junction widths have been fabricated.…”

Section: Introductionmentioning

confidence: 99%

Half-integer Shapiro steps in MgB₂ focused He ion beam Josephson junctions

Yin 殷,

Cai 蔡,

Xu 徐

et al. 2024

Chinese Phys. B

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Half-integer microwave induced steps (Shapiro steps) have been observed in many different Josephson Junction systems which have attracted a lot of intention because they signify the deviation of current phase relation (CPR) and uncover many unconventional physical properties. In this article, we first report the discovery of half-integer Shapiro steps in MgB2 Focused He Ion Beam (He-FIB) Josephson Junctions. The half-integer steps’ dependence on microwave frequency, temperature, microwave power and magnetic field is also analysed. We find that the existence of half-integer steps can be controlled by magnetic field periodically which is similar with that of high temperature superconductors (HTS) grain boundary junctions and the similarity of the microstructures between gain boundary junctions and He-FIB junctions is discussed. As a consequence, we mainly attribute the physical origin of half-integer steps in MgB2 He-FIB junctions to the model that a He-FIB junction is analogous to a parallel junctions’ array. Our results show that He-FIB technology is a promising platform for researching CPR in junctions made of different superconductors.

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Section: Introductionmentioning

confidence: 99%

Half-integer Shapiro steps in MgB₂ focused He ion beam Josephson junctions

Yin 殷,

Cai 蔡,

Xu 徐

et al. 2024

Chinese Phys. B

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Thermal excitation-induced micro/nano fabrication and material modification of superconducting Nb films

Shi,

Zhang,

Zhou

et al. 2024

Applied Physics Letters

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We report the thermal excitation-induced material modification and micro/nano fabrication based on the interactions between nano laser direct writing (NLDW) and superconducting films experimentally and by simulation. The niobium (Nb) films with a critical temperature of 9 K were deposited on silicon substrate via sputtering with the thickness of around 50 nm. The boundary between material modification and micro/nano fabrication was verified by changing the interaction time and laser power continuously. Specifically, as the laser power was fixed at 250 mW and the interaction time below 440 ns, the interaction is material modification. With the increasing interaction time further, the Nb films were etched away. As the interaction time was fixed at 500 ns and the laser power below 200 mW, the interaction is material modification too. With the increasing of laser power further, the Nb films were etched away. In the experiment, the oxygen content and current–voltage characteristic (IVCs) before and after laser irradiation were displayed to verify the material modification, which is in line with the simulation results. Considering the 50 nm resolution of NLDW, in the material modification region, one could trim trilayer junctions, tune shunt resistors, or adjust critical currents, etc. In the micro/nano fabrication region, one could fabricate various devices and exploit the properties of high spatial resolution, high flexibility, and fast processing.

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Fabrication and Application of Nano-SQUID Magnetometer to Scanning Imaging of Two-Dimensional Quantum Materials

Xiang,

Wang,

et al. 2024

Electromag. Sci.

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Transport Properties of NbN Thin Films Patterned With a Focused Helium Ion Beam

Cited by 3 publications

References 33 publications

Half-integer Shapiro steps in MgB₂ focused He ion beam Josephson junctions

Half-integer Shapiro steps in MgB₂ focused He ion beam Josephson junctions

Thermal excitation-induced micro/nano fabrication and material modification of superconducting Nb films

Fabrication and Application of Nano-SQUID Magnetometer to Scanning Imaging of Two-Dimensional Quantum Materials

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Transport Properties of NbN Thin Films Patterned With a Focused Helium Ion Beam

Cited by 3 publications

References 33 publications

Half-integer Shapiro steps in MgB2 focused He ion beam Josephson junctions

Half-integer Shapiro steps in MgB2 focused He ion beam Josephson junctions

Thermal excitation-induced micro/nano fabrication and material modification of superconducting Nb films

Fabrication and Application of Nano-SQUID Magnetometer to Scanning Imaging of Two-Dimensional Quantum Materials

Contact Info

Product

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Half-integer Shapiro steps in MgB₂ focused He ion beam Josephson junctions

Half-integer Shapiro steps in MgB₂ focused He ion beam Josephson junctions