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Free and forced Barkhausen noises in magnetic thin film based cross-junctions

Title
Free and forced Barkhausen noises in magnetic thin film based cross-junctions
Authors
Aly, Amir Ibrahim ElzawawyTalantsev, A.Kim, Cheol Gi
DGIST Authors
Kim, Cheol Gi
Issue Date
2018-07
Citation
Journal of Magnetism and Magnetic Materials, 458, 292-300
Type
Article
Article Type
Article
Keywords
AnisotropyDomain wallsEnhanced magnetoresistanceHall effectMagnetic devicesMagnetic domainsMagnetic fieldsMagnetic thin filmsMagnetismMagnetizationMagnetoresistanceThin filmsBarkhausen noiseCritical magnetic fieldDomain-wall depinningIrreversible magnetizationMagnetization switchingPlanar Hall effectSweeping magnetic fieldsThermal fluctuationsMagnetic field effects
ISSN
0304-8853
Abstract
Barkhausen noise, driven by thermal fluctuations in stationary magnetic field, and Barkhausen jumps, driven by sweeping magnetic field, are demonstrated to be effects of different orders of magnitude. The critical magnetic field for domain walls depinning, followed by avalanched and irreversible magnetization jumps, is determined. Magnetoresistive response of NiFe/M/NiFe (M = Au, Ta, Ag) trilayers to stationary and sweeping magnetic field is studied by means of anisotropic magnetoresistance (AMR) and planar Hall effect (PHE) measurements. Thermal fluctuations result in local and reversible changes of magnetization of the layers in thin film magnetic junctions, while the sweeping magnetic field results in reversible and irreversible avalanched domain motion, dependently on the ratio between the values of sweeping magnetic field and domain wall depinning field. The correlation between AMR and PHE responses to Barkhausen jumps is studied. The value of this correlation is found to be dependent on the α angle between the directions of magnetic field and current path. © 2018 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/6391
DOI
10.1016/j.jmmm.2018.03.042
Publisher
Elsevier B.V.
Related Researcher
  • Author Kim, CheolGi Lab for NanoBio-MatErials & SpinTronics(nBEST)
  • Research Interests Magnetic Materials and Spintronics; Converging Technology of Nanomaterials and Biomaterials; Bio-NEMS;MEMS
Files:
There are no files associated with this item.
Collection:
Department of Emerging Materials ScienceLab for NanoBio-Materials & SpinTronics(nBEST)1. Journal Articles


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