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Title: Spin texture on top of flux avalanches in Nb/Al 2 O 3 /Co thin film heterostructures

Abstract

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. Published by AIP Publishing.

Authors:
; ; ORCiD logo; ORCiD logo; ORCiD logo; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Centro Brasileiro de Pesquisas Fisicas (CBPF); Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq); USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1376887
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 1; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English

Citation Formats

Lopes, R. F., Carmo, D., Colauto, F., Ortiz, W. A., de Andrade, A. M. H., Johansen, T. H., Baggio-Saitovitch, E., and Pureur, P. Spin texture on top of flux avalanches in Nb/Al 2 O 3 /Co thin film heterostructures. United States: N. p., 2017. Web. doi:10.1063/1.4973529.
Lopes, R. F., Carmo, D., Colauto, F., Ortiz, W. A., de Andrade, A. M. H., Johansen, T. H., Baggio-Saitovitch, E., & Pureur, P. Spin texture on top of flux avalanches in Nb/Al 2 O 3 /Co thin film heterostructures. United States. doi:10.1063/1.4973529.
Lopes, R. F., Carmo, D., Colauto, F., Ortiz, W. A., de Andrade, A. M. H., Johansen, T. H., Baggio-Saitovitch, E., and Pureur, P. Sat . "Spin texture on top of flux avalanches in Nb/Al 2 O 3 /Co thin film heterostructures". United States. doi:10.1063/1.4973529.
@article{osti_1376887,
title = {Spin texture on top of flux avalanches in Nb/Al 2 O 3 /Co thin film heterostructures},
author = {Lopes, R. F. and Carmo, D. and Colauto, F. and Ortiz, W. A. and de Andrade, A. M. H. and Johansen, T. H. and Baggio-Saitovitch, E. and Pureur, P.},
abstractNote = {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. Published by AIP Publishing.},
doi = {10.1063/1.4973529},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 1,
volume = 121,
place = {United States},
year = {2017},
month = {1}
}

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