2024-03-29T15:38:10Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/525472022-03-25T12:41:20Zcom_10261_31com_10261_3col_10261_284
2012-06-29T09:18:28Z
urn:hdl:10261/52547
Correlation between the magnetic imaging of cobalt nanoconstrictions and their magnetoresistance response
Fernández-Pacheco, Amalio
Serrano-Ramón, Luis
Córdoba, R.
Ibarra, M. Ricardo
Teresa, José María de
Scanning transmission x-ray microscopy (STXM) and magnetoresistance (MR) measurements are used to investigate the magnetic behavior of a nanoconstriction joining two micrometric electrodes (a pad and a wire). The reversal of the magnetization under variable external static magnetic fields is imaged. By means of a detailed analysis of the STXM images at the nanocontact area, the MR is calculated, based on diffusive anisotropic-MR. This MR agrees well with that obtained from electrical transport measurements, allowing a direct correlation between the MR signal and the magnetic reversal of the system. The magnetization behavior depends on the sample thickness and constriction dimensions. In 40nm-thick samples, with 20×175nm 2 contact areas, the magnetization at the two sides of the constriction forms a net angle of 90°, with a progressive evolution of the magnetization structure between the electrodes during switching. The MR in those cases has a more peaked shape than with 20nm-thick electrodes and 10×80nm 2 contact areas, where the magnetization forms 180°between them, with a wide domain wall pinned at the constriction. As a consequence of this configuration, a plateau in the MR is observed for about 20Oe. © 2012 IOP Publishing Ltd.
2012-06-29T09:18:28Z
2012-06-29T09:18:28Z
2012
2012-06-29T09:18:28Z
artículo
Nanotechnology 23(10): 105703 (2012)
http://hdl.handle.net/10261/52547
10.1088/0957-4484/23/10/105703
eng
closedAccess
Institute of Physics Publishing