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Free and forced Barkhausen noises in magnetic thin film based cross-junctions
Elzwawy, Amir,Talantsev, Artem,Kim, CheolGi Elsevier 2018 Journal of magnetism and magnetic materials Vol.458 No.-
<P><B>Abstract</B></P> <P>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 <I>α</I> angle between the directions of magnetic field and current path.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Planar Hall effect (PHE) is studied together with anisotropic MR (AMR). </LI> <LI> The jumps on PHE and AMR vs magnetic field curves are asynchronous. </LI> <LI> The correlation between PHE and AMR jumps is governed by magnetic field direction. </LI> <LI> At low fields the combination of AMR and GMR effects results in linear response. </LI> <LI> The sensor’s noise is reduced, if the Au instead of Ag is used as an interlayer material. </LI> </UL> </P>