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Tunneling and anisotropic-tunneling magnetoresistance in iron nanoconstrictions fabricated by focused-ion-beam

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Abstract

We report the magnetoresistance (MR) measurements in a nanoconstriction fabricated by focused-ion-beam (FIB) in the tunneling regime of conductance. The resistance of the contact was controlled during the fabrication process, being stable in the metallic regime, near the conductance quantum, and under high vacuum conditions. The metallic contact was deteriorated when exposed to atmosphere, resulting in a conduction mechanism by tunneling. The TMR was found to be of 3% at 24 K. The anisotropic tunneling magnetoresistance (TAMR) was around 2% for low temperatures, with a field angle dependence more abrupt than in bulk Fe. This preliminary result is promising for the application of this technique to fabricate stable ferromagnetic constrictions near the atomic regime of conductance, where high MR values are expected.

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Acknowledgments

Financial support by the Spanish Monistry of Science (through project MAT2008-06567-C02, including FEDER funding), and the Aragon Regional Government are acknowledged.

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Authors and Affiliations

  1. Instituto de Nanociencia de Aragón, Universidad de Zaragoza, Zaragoza, 50009, Spain

    Amalio Fernández-Pacheco, R. Córdoba & Ricardo Ibarra

  2. Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, Facultad de Ciencias, Zaragoza, 50009, Spain

    Amalio Fernández-Pacheco, José M. De Teresa & Ricardo Ibarra

  3. Departamento de Física de la Materia Condensada, Universidad de Zaragoza, Facultad de Ciencias, Zaragoza, 50009, Spain

    Amalio Fernández-Pacheco, José M. De Teresa, R. Córdoba & Ricardo Ibarra

Authors
  1. Amalio Fernández-Pacheco
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  2. José M. De Teresa
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  3. R. Córdoba
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  4. Ricardo Ibarra
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Fernández-Pacheco, A., De Teresa, J.M., Córdoba, R. et al. Tunneling and anisotropic-tunneling magnetoresistance in iron nanoconstrictions fabricated by focused-ion-beam. MRS Online Proceedings Library 1181, 1–6 (2009). https://doi.org/10.1557/PROC-1181-DD02-03

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