Effect of oxidation of cobalt-based nanowires on NMR spin-lattice relaxation

Abstract

Nuclear spin-lattice relaxation measurements were performed on Co-based magnetic nanowires, in zero field and in 1 T applied field. A measurement method is developped that allows a confident interpretation of the experimental data. An enhanced relaxation due to a thermally activated phenomenon associated to oxidation is reported for the first time in the nuclear magnetic resonance of ferromagnetic systems.

Magnetic structure and internal field nuclear magnetic resonance of cobalt nanowires

“…Others have addressed nanowires made of pure cobalt as well as Co-Cu alloys and multilayers. [35][36][37][38] In combination with X-ray diffraction (XRD) measurements, they studied the crystalline structure of those three kinds of samples for different synthesis parameters. They found that a fast deposition rate favors the appearance of a face-centered cubic (fcc) crystalline structure, while a pure hexagonal close packed (hcp) phase is formed using slow deposition rates.…”