TY - JOUR

T1 - Finite-size effect on vortex loop excitation in amorphous-W/Si multilayers

AU - Matsuo, Y.

AU - Nojima, T.

AU - Majková, E.

AU - Kuwasawa, Y.

N1 - Funding Information:
The authors would like to thank I. Kameyama and Y. Kato for the technical supports in our experiments. They also express their thanks to S.W. Pierson for the useful discussion. One of the authors (E.M.) acknowledges the support by the JSPS and by the grant No. 5305/476 of the Slovak Grant Agency VEGA. This work is supported in part by a Grant-in Aid for Basic Scientific Research from the Ministry of Education, Science and Culture of Japan.

PY - 1998/4/10

Y1 - 1998/4/10

N2 - A finite size effect on vortex configuration is investigated by the measurements of current-voltage (I-V) characteristics on amorphous-W/Si multilayers as a function of the number of the bilayers N in the absence of field. Critical scaling analysis of the data for the samples with N ≥ 10 shows that the vortex loops are the favored excitation with the dynamic critical exponent z ∼ 3.32, while for 10 > N ≥ 3 it reveals to deviate from the scaling function corresponding with a finite size effect on vortex loops. At a small current density, the vortex loop is probed at a length scale larger than the total sample thickness. A remarkable change in the I-V characteristics is observed between N = 3 and 2. This indicates the vortex configuration crossover to vortex-antivortex string pairs piercing all layers at N = 2. In sample with N = 1, the typical KT transition is observed.

AB - A finite size effect on vortex configuration is investigated by the measurements of current-voltage (I-V) characteristics on amorphous-W/Si multilayers as a function of the number of the bilayers N in the absence of field. Critical scaling analysis of the data for the samples with N ≥ 10 shows that the vortex loops are the favored excitation with the dynamic critical exponent z ∼ 3.32, while for 10 > N ≥ 3 it reveals to deviate from the scaling function corresponding with a finite size effect on vortex loops. At a small current density, the vortex loop is probed at a length scale larger than the total sample thickness. A remarkable change in the I-V characteristics is observed between N = 3 and 2. This indicates the vortex configuration crossover to vortex-antivortex string pairs piercing all layers at N = 2. In sample with N = 1, the typical KT transition is observed.

KW - Critical scaling

KW - Finite size effects

KW - Vortex configuration

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U2 - 10.1016/S0921-4534(98)00072-0

DO - 10.1016/S0921-4534(98)00072-0

M3 - Article

AN - SCOPUS:0347483282

VL - 299

SP - 23

EP - 30

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - 1-2

ER -