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Journal Articles

Observation of an extended magnetic field penetration in amorphous superconducting MoGe films

Nishio, Taichiro*; Okayasu, Satoru; Suzuki, Junichi; Kokubo, Nobuhito*; Kadowaki, Kazuo*

Physical Review B, 77(5), p.052503_1 - 052503_4, 2008/02

https://doi.org/10.1103/PhysRevB.77.052503
 Times Cited Count：16 Percentile：56.61(Materials Science, Multidisciplinary)

We have observed the magnetic field distribution of a vortex generated in amorphous ($$alpha$$)-MoGe thin films with various thicknesses ($$d$$) ($$<$$$$lambda$$, where $$lambda$$ is the penetration depth) with a scanning SQUID microscope. From analyses of the field distribution as functions of the film thickness and temperature, it is found that an effective in-plane penetration depth ($$Lambda$$) extends with descreasing d, in accordance with the Pearl's prediction $$Lambda$$=2$$lambda$$$$^{2}$$/$$d$$. Temperature dependence of $$Lambda$$ is also consistent with the two-fluid model involving the Pearl's prediction.

Journal Articles

Penetration of vortices into micro-superconductors observed with a scanning SQUID microscope

Nishio, Taichiro; Okayasu, Satoru; Suzuki, Junichi; Kadowaki, Kazuo

Physica C, 412-414(Part1), p.379 - 384, 2004/10

We have studied the vortex states in a meoscopic superconductor with geometrical constraints such as disks, triangles, squares, etc. with dimensions between 30-50$$mu$$m using a scanning SQUID microscope (SQM2000,Seiko Instruments Inc.). The sample was fabricated by electron lithography and Focused Ion Beam (FIB) techniques. Quantized vortices enter into a mesoscopic superconductor discretely as a function of magnetic field accompanied by the sequential step-wise jump of magnetization of the superconductor. Quantitative as well as qualitative analyses of spatial vortex arrangement as a function of the number of vortices will be shown in comparison with the recent theoretical predictions.

Journal Articles

Scanning SQUID microscopy on magnetic flux systems

Suzuki, Junichi; Kadowaki, Kazuo; Hata, Yoshiaki*; Okayasu, Satoru; Nishio, Taichiro; Kakeya, Itsuhiro*; Odawara, Akikazu*; Nagata, Atsushi*; Nakayama, Satoshi*; Chinone, Kazuo*

Teion Kogaku, 38(9), p.485 - 492, 2003/09

https://doi.org/10.2221/jcsj.38.485

no abstracts in English

Journal Articles

Flux quantanization in a superconducting microdisk

Hata, Yoshiaki; Suzuki, Junichi; Kakeya, Itsuhiro*; Kadowaki, Kazuo*; Odawara, Akikazu*; Nagata, Atsushi*; Nakayama, Satoshi*; Chinone, Kazuo*

Physica C, 388-389(1-4), p.719 - 720, 2003/05

no abstracts in English

Journal Articles

Vortex imaging of magnetic superconductor HoNi$$_{2}$$B$$_{2}$$C by scanning SQUID microscopy

Hata, Yoshiaki; Suzuki, Junichi; Kakeya, Itsuhiro*; Kadowaki, Kazuo*; Nakayama, Satoshi*; Nagata, Atsushi*; Odawara, Akikazu*; Chinone, Kazuo*

Physica C, 378-381(Part1), p.420 - 423, 2002/10

no abstracts in English

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