排序方式: 共有16条查询结果,搜索用时 0 毫秒
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S. M. Ishikaev É. V. Matizen V. V. Ryazanov V. A. Oboznov A. V. Veretennikov 《JETP Letters》2000,72(1):26-29
The field dependence of the magnetic moment of square (100×100) Josephson networks was examined with the use of a SQUID magnetometer. The field dependence of the magnetic moment was found to be regular with features corresponding to integer and half-integer numbers of flux quanta per cell. At temperatures below 5.8 K, jumps in the magnetization curves associated with the entry and exit of avalanches of tens and hundreds of fluxons were observed. It was shown that the probability distribution of these processes corresponded to the theory of self-organized criticality. An avalanche character of flux motion was observed at temperatures at which the size of the fluxons did not exceed the size of the cell, that is, when a discrete vortex structure occurred. 相似文献
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Ryazanov VV Oboznov VA Rusanov AY Veretennikov AV Golubov AA Aarts J 《Physical review letters》2001,86(11):2427-2430
We report measurements of the temperature dependence of the critical current, I(c), in Josephson junctions consisting of conventional superconducting banks of Nb and a weakly ferromagnetic interlayer of a CuxNi1-x alloy, with x around 0.5. With decreasing temperature I(c) generally increases, but for specific thicknesses of the ferromagnetic interlayer, a maximum is found followed by a strong decrease down to zero, after which I(c) rises again. Such a sharp cusp can be explained only by assuming that the junction changes from a 0-phase state at high temperatures to a pi phase state at low temperatures. 相似文献
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I. S. Veshchunov V. A. Oboznov A. N. Rossolenko A. S. Prokofiev L. Ya. Vinnikov A. Yu. Rusanov D. V. Matveev 《JETP Letters》2008,88(11):758-761
We report on the first experimental visualization of domain structure in films of weakly ferromagnetic Cu0.47Ni0.53 alloy with different thickness at liquid helium temperatures. Improved high-resolution Bitter decoration technique was used
to map the magnetic contrast on the surface of the films well below the Curie temperature TCurie (∼60 K). In contrast to magnetic force microscopy, this technique allowed visualization of the domain structure without its
disturbance while the larger areas of the sample were probed. Maze-like domain patterns, typical for perpendicular magnetic
anisotropy, were observed. The average domain width was found to be about 100 nm.
The article is published in the original. 相似文献
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V. M. Krasnov A. E. Kovalev V. A. Oboznov N. F. Pedersen 《Czechoslovak Journal of Physics》1996,46(Z2):715-716
Transport properties of Nb/Cu multilayers were measured along and across layers. 3D-2D crossover occurs both when the temperature
is belowT
2D and when the magnetic field parallel to layers exceeds the ‘breaking field’,H
br. 相似文献
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JETP Letters - The field dependence of the magnetic moment of square (100×100) SNS-type Josephson junction arrays was studied by a SQUID magnetometer. A considerable difference in the behavior... 相似文献
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