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Free and forced Barkhausen noises in magnetic thin film based cross-junctions
- Free and forced Barkhausen noises in magnetic thin film based cross-junctions
- Aly, Amir Ibrahim Elzawawy; Talantsev, A.; Kim, Cheol Gi
- DGIST Authors
- Kim, Cheol Gi
- Issue Date
- Journal of Magnetism and Magnetic Materials, 458, 292-300
- Article Type
- Anisotropy; Domain walls; Enhanced magnetoresistance; Hall effect; Magnetic devices; Magnetic domains; Magnetic fields; Magnetic thin films; Magnetism; Magnetization; Magnetoresistance; Thin films; Barkhausen noise; Critical magnetic field; Domain-wall depinning; Irreversible magnetization; Magnetization switching; Planar Hall effect; Sweeping magnetic fields; Thermal fluctuations; Magnetic field effects
- 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.
- Elsevier B.V.
- Related Researcher
Lab for NanoBio-MatErials & SpinTronics(nBEST)
Magnetic Materials and Spintronics; Converging Technology of Nanomaterials and Biomaterials; Bio-NEMS;MEMS
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- Department of Emerging Materials ScienceLab for NanoBio-Materials & SpinTronics(nBEST)1. Journal Articles
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