Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: MagneticThin Films II
MA 46.1: Vortrag
Donnerstag, 29. März 2012, 15:00–15:15, EB 202
Local pinning in Co ferromagnetic nanowires induced by ion irradiation — •Luis Serrano-Ramón1,2, Amalio Fernández-Pacheco3, Rosa Córdoba2, Tolek Tyliszczak4, Ricardo Ibarra1,2, and José M. de Teresa1,2 — 1Instituto de Ciencias Materiales de Aragón, Zaragoza, Spain — 2Laboratorio de Microscopías Avanzadas, Zaragoza, Spain — 3Cavendish Laboratory, Cambridge, UK — 4Lawrence Berkeley National Laboratory, Berkeley, USA
The control of the movement of a domain wall in a ferromagnetic nanowire has been systematicaly studied with the aim of building ultrafast spintronic logic or storing devices [1,2]. Geometric constrictions are widely used to create local confining potentials that act as pinning sites for individual domain walls. As an alternative, the local modification of magnetic propierties by ion irradiation is suitable to induce pinning sites [3]. In this work high purity Co nanowires grown by Focused Electron Beam Induced Deposition [4, 5] have been irradiated with Ga+ in order to study the change induced by this proccess in their magnetic propierties. A systematic increase in the nucleation field of the wires has been observed by Magneto-Optical Kerr Effect. Local pinning sites induced by the irradiation have been succesfully created on 250 nm wide wires. The pinning force has been studied by Scanning Transmission X-Ray Microscopy and MOKE. [1] Parkin et al, Science, 320,190-194,(2008); [2] D. A. Allwood et al, Science, 309, 1688-1692, (2005);[3] Andreas Vogel et al, APL, 98, 202501, (2011); [4] A. Fernandez-Pacheco et al, J. Phys D, 42, 055005, (2009); [5] L. Serrano-Ramón et al, ACSnano, 5, 7781,(2011).