Spin texture on top of flux avalanches in Nb/Al2O3/Co thin film heterostructures

Lopes, R. F.; Carmo, D.; Colauto, F.; Ortiz, W. A.; de Andrade, A. M.  H.; Johansen, T. H.; Baggio-Saitovitch, E.; Pureur, P.

doi:10.1063/1.4973529

Title: Spin texture on top of flux avalanches in Nb/Al₂O₃/Co thin film heterostructures

Journal Article · Fri Jan 06 00:00:00 EST 2017 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4973529· OSTI ID:1376887

Lopes, R. F. ^[1]; Carmo, D. ^[2];

^[3];

^[2];

^[1]; Johansen, T. H. ^[4]; Baggio-Saitovitch, E. ^[5]; Pureur, P. ^[1]

Univ. Federal do Rio Grande do Sul (Brazil). Inst. de Fisica
Univ. Federal de Sao Carlos (Brazil). Dept. de Fisica
Univ. Federal de Sao Carlos (Brazil). Dept. de Fisica; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Univ. of Oslo (Norway); Univ. of Wollongong, NSW (Australia)
Centro Brasileiro de Pesquisas Físicas (Brazil)

We report on magneto-optical imaging, magnetization, Hall effect, and magneto-resistance experiments in Nb/Al₂O₃/Co thin film heterostructures. The magneto-transport measurements were performed in samples where electrical contacts were placed on the Co layer. The magnetic field is applied perpendicularly to the plane of the film and gives rise to abrupt flux penetration of dendritic form. A magnetization texture is imprinted in the Co layer in perfect coincidence with these ramifications. The spin domains that mimic the vortex dendrites are stable upon the field removal. Moreover, the imprinted spin structure remains visible up to room temperature. In the region of the field-temperature diagram where flux instabilities are known to occur in bare Nb films, irregular jumps are observed in the magnetic hysteresis and large amplitude noise is detected in the magneto-resistance and Hall resistivity data when measured as a function of the field.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: Centro Brasileiro de Pesquisas Fisicas (CBPF); Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1376887

Journal Information:: Journal of Applied Physics, Vol. 121, Issue 1; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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