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Título

NanoSQUID magnetometry on individual as-grown and annealed Co nanowires at variable temperature

AutorMartínez Pérez, M. J. CSIC ORCID; Pablo-Navarro, Javier CSIC ORCID; Müller, B.; Kleiner, R.; Magén, César ; Koelle, D.; Teresa, José María de CSIC ORCID ; Sesé Monclús, Javier CSIC ORCID
Palabras claveNanoSQUID
Focused electron beam induced deposition
Magnetic nanowires
Magnetization measurements
Fecha de publicación2018
EditorAmerican Chemical Society
CitaciónNano Letters 18(12): 7674-7682 (2018)
ResumenPerforming magnetization studies on individual nanoparticles is a highly demanding task, especially when measurements need to be carried out under large sweeping magnetic fields or variable temperature. Yet, characterization under varying ambient conditions is paramount in order to fully understand the magnetic behavior of these objects, e.g., the formation of nonuniform states or the mechanisms leading to magnetization reversal and thermal stability. This, in turn, is necessary for the integration of magnetic nanoparticles and nanowires into useful devices, e.g., spin-valves, racetrack memories, or magnetic tip probes. Here, we show that nanosuperconducting quantum interference devices based on high critical temperature superconductors are particularly well suited for this task. We have successfully characterized a number of individual Co nanowires grown through focused electron beam induced deposition and subsequently annealed at different temperatures. Magnetization measurements performed under sweeping magnetic fields (up to ∼100 mT) and variable temperature (1.4-80 K) underscore the intrinsic structural and chemical differences between these nanowires. These point to significant changes in the crystalline structure and the resulting effective magnetic anisotropy of the nanowires, and to the nucleation and subsequent vanishing of antiferromagnetic species within the nanowires annealed at different temperatures.
Versión del editorhttps://doi.org/10.1021/acs.nanolett.8b03329
URIhttp://hdl.handle.net/10261/181195
DOI10.1021/acs.nanolett.8b03329
ISSN1530-6984
E-ISSN1530-6992
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