Vortex distribution in amorphous Mo80Ge20 plates with artificial pinning center

Matsumoto, Hitoshi; Huy, Ho Thanh; Miyoshi, Hiroki; Okamoto, Takuto; Kato, Masaru; Ishida, Toshimasa

doi:10.1016/j.physc.2016.06.015

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…Multiple-shell structures in small disks [5,12] exhibit a vortex filling rule which is dependent on the shape of the plates. Complex vortex configurations have been observed by introducing an artificial pin [1] and a regular concave decagon plate or a star-shaped plate into a film [13,14]. Vortices in a type II-superconducting plate sense potential barriers upon entering the interior of the plate, and are influenced by vortex-vortex interactions, the confinement provided by the Meissner shielding currents [15,16], the Bean-Livingston surface barrier, surface roughness, and defects at the interface [17,18].…”

Section: Introductionmentioning

confidence: 99%

Confined vortices in de facto mesoscopic Mo₈₀Ge₂₀ disks with sector defects

Huy

Ito

Takeuchi

et al. 2018

Supercond. Sci. Technol.

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Section: Introductionmentioning

confidence: 99%

Confined vortices in de facto mesoscopic Mo₈₀Ge₂₀ disks with sector defects

Huy

Ito

Takeuchi

et al. 2018

Supercond. Sci. Technol.

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“…In [6,7,[13][14][15][16][17], we used a commercial scanning SQUID microscope (SQM2000, Seiko Instruments) to observe the vortex states in mesoscopic superconductor plates of different geometries. The SQUID microscope is equipped with a single-channel SQUID sensor, an XYZ scanning stage, a heliumflow cryostat, and a dc SQUID control system [18].…”

Section: Introductionmentioning

confidence: 99%

SQUID microscopy for mapping vector magnetic fields

Miyajima

Takeuchi

et al. 2019

Supercond. Sci. Technol.

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We mounted a vector-scanning superconducting quantum interference device (SQUID) sensor on a commercial SQUID microscope and successfully improved the sensitivity and spatial resolution of the sensor. Our proposed vector 3D SQUID sensor used multilayered niobium (Nb)-based technology; we realized three SQUID sensors in the structure of a vector pickup coil system on a single chip. The vector pickup coil system was built with three pickup coils that were orthogonal to one another to obtain the X, Y, and Z components of a magnetic field vector. To improve both sensitivity and spatial resolution, we attempted to reduce the inner diameter by increasing the number of windings of the pickup coils using the multilayered Nb process. The design value for the dc SQUID sensors was either the critical current density Jc = 320A cm−2 for two Josephson junctions (JJs) or the critical current Ic = 12.8μA for the 2μm × 2μm JJs. To measure the current–voltage (I–V) and voltage–flux (V–Φ) characteristics of a sensor, we constructed a homemade measurement system. The fundamental characteristics of our SQUID sensors were in good agreement with the design parameters. We mounted our vector SQUID sensor on a commercial scanning SQUID microscope (SQM2000, Seiko Instrument Inc.) with a single flux-locked loop channel to test one of the three channels. We repeated the measurements three times to obtain the X, Y, and Z componential images of the magnetic field from a single vortex, and we synthesized the 3D mapping of the magnetic field vectors from a single vortex. We proved that our sensor mounted on a SQUID microscope was suitable for measuring the X, Y, and Z components of a vector magnetic field.

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