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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Imprinting superconducting vortex footsteps in a magnetic layer

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Autor(es):
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Brisbois, Jeremy [1] ; Motta, Maycon [2] ; Avila, Jonathan I. [1] ; Shaw, Gorky [1, 3, 4] ; Devillers, Thibaut [3, 4] ; Dempsey, Nora M. [3, 4] ; Veerapandian, Savita K. P. [1] ; Colson, Pierre [5] ; Vanderheyden, Benoit [6, 7] ; Vanderbemden, Philippe [6, 7] ; Ortiz, Wilson A. [2] ; Nguyen, Ngoc Duy ; Kramer, Roman B. G. [3, 4] ; Silhanek, Alejandro V. [8]
Número total de Autores: 14
Afiliação do(s) autor(es):
[1] Univ Liege, Dept Phys, B-4000 Sart Tilman Par Liege - Belgium
[2] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Grenoble Alpes, Inst NEEL, F-38000 Grenoble - France
[4] CNRS, Inst NEEL, F-38000 Grenoble - France
[5] Univ Liege, Ctr Appl Technol Microscopy GREENMAT, B-4000 Sart Tilman Par Liege - Belgium
[6] Univ Liege, SUPRATECS, B-4000 Sart Tilman Par Liege - Belgium
[7] Univ Liege, Dept Elect Engn & Comp Sci, B-4000 Sart Tilman Par Liege - Belgium
[8] Ngoc Duy Nguyen, Univ Liege, Dept Phys, B-4000 Sart Tilman Par Liege - Belgium
Número total de Afiliações: 8
Tipo de documento: Artigo Científico
Fonte: SCIENTIFIC REPORTS; v. 6, JUN 6 2016.
Citações Web of Science: 15
Resumo

Local polarization of a magnetic layer, a well-known method for storing information, has found its place in numerous applications such as the popular magnetic drawing board toy or the widespread credit cards and computer hard drives. Here we experimentally show that a similar principle can be applied for imprinting the trajectory of quantum units of flux ( vortices), travelling in a superconducting film (Nb), into a soft magnetic layer of permalloy (Py). In full analogy with the magnetic drawing board, vortices act as tiny magnetic scribers leaving a wake of polarized magnetic media in the Py board. The mutual interaction between superconducting vortices and ferromagnetic domains has been investigated by the magneto-optical imaging technique. For thick Py layers, the stripe magnetic domain pattern guides both the smooth magnetic flux penetration as well as the abrupt vortex avalanches in the Nb film. It is however in thin Py layers without stripe domains where superconducting vortices leave the clearest imprints of locally polarized magnetic moment along their paths. In all cases, we observe that the flux is delayed at the border of the magnetic layer. Our findings open the quest for optimizing magnetic recording of superconducting vortex trajectories. (AU)

Processo FAPESP: 07/08072-0 - Pesquisa fundamental em supercondutividade e magnetismo - sistemas com potencial para aplicações: óxidos avançados e supercondutores dotados de estruturas artificiais
Beneficiário:Wilson Aires Ortiz
Linha de fomento: Auxílio à Pesquisa - Temático