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Title

Simultaneous study of magnetization reversal and magnetoresistance in uniaxial magnetic anisotropy systems

AuthorsMaccariello, D.; Perna, Paolo; Cuñado, J. L. F.; Bollero, A.; Niño, M.A.; Pedrosa, J.; Muñoz Sánchez, Manuel ; Prieto, J. L.; Camarero, Julio; Miranda, Rodolfo
Issue DateSep-2013
CitationDonostia International Conference on Nanoscaled Magnetism and Applications (2013)
AbstractMagnetoresistive effects and related phenomena in magnetic nanostructures have found widespread applications in magnetic sensing and recording technologies. Even though it is commonly assumed that the magnetoresistance (MR) depends on the magnetic anisotropy, i.e., anisotropic magnetoresistance (AMR), the direct proof that the magnetoresistive responses are directly related to the magnetization reversal processes is still lacking. In this work, we present a systematic angular-dependent study on magnetization reversal processes and magnetoresistive responses of a ferromagnetic metal thin film with well-defined uniaxial magnetic anisotropy. In-plane resolved magnetization curves (i.e., M||(H) and M(H)), acquired by high resolution vectorial-Kerr magnetometry, and their corresponding resistance changes (MR(H)), by using a four-probe ac scheme, were measured simultaneously with a new MagnetoResistance-Optical Kerr-Effect [M(R)OKE] setup [1]. The dependences with the direction of applied magnetic field (αH) and current (θi) with respect to the anisotropy axis were investigated. Magnetization loops strongly depend on αH, whereas MR curves rely on both applied field and current flow directions. M||(H) and M(H) curves give the relevant information about the magnetization reversal processes and lead to the direct determination of the magnetization direction during the hysteresis loop, highlighting the importance of vectorial-magnetometry measurements. The maximum (minimum) MR value is found when the magnetization is aligned parallel (perpendicular) to the current direction. The magnitude and shape of MR(H) are controlled by the orientations of the applied field and current with the magnetic anisotropy axis. Remarkably, for a given αH, constant, negative, or positive hysteretic magnetoresistive loop behaviors are found depending on θi. The data clearly show that both longitudinal and transversal mangetoresistance (i.e., AMR and PHE) loops are governed by the orientation of magnetizat ion with respect to the current flow direction.
DescriptionComunicación presentada en la Donostia International Conference on Nanoscaled Magnetism and Applications (DICNMA), celebrada en San Sebastián del 9 al 13 de septiembre de 2013.
URIhttp://hdl.handle.net/10261/135602
Appears in Collections:(IMN-CNM) Comunicaciones congresos
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