Agradecimentos: This research was partially financially supported by Conselho Nacional de Desenvolvimento e Científico e Tecnológico (CNPq, Brazil) through both the internship program Science without Borders (grant no. 200864/2015-7) and the Universal Project (grant no. 436573/2018-0). This work was...

Agradecimentos: This research was partially financially supported by Conselho Nacional de Desenvolvimento e Científico e Tecnológico (CNPq, Brazil) through both the internship program Science without Borders (grant no. 200864/2015-7) and the Universal Project (grant no. 436573/2018-0). This work was also financially supported the COST Action CELINA CM1301, the Swiss State Secretariat for Education, Research and Innovation SERI (project C14.0087), and by the Brazilian funding agency Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, grant no. 2017/10581-1). The authors declare no competing financial interest. The authors are grateful to the Institute of Physics Gleb Wataghin (IFGW) and the Center for Semiconductor Components and Nanotechnologies (CCSNano) of the University of Campinas (UNICAMP), the Brazilian Synchrotron Light Laboratory (LNLS) facility of the Brazilian Center for Research in Energy and Materials (CNPEM), and the Swiss Federal Laboratories for Material Science and Technology (EMPA) for the experimental support. We also want to thank Dr. Luis Carlos Costa Arzuza and Peterson Carvalho from the Laboratory for Materials and Low Temperatures of the University of Campinas (LMBT–UNICAMP) for the experimental support on the MOKE analysis

Abstract: We report on direct writing of functional nanostructures of Co-C-O nanocomposites by use of the focused-electron-beam-induced deposition (FEBID) with the organometallic precursor Co-2(CO)(8). The magneto-transport properties and the quasi-static magnetization process of Co-C-O deposits...

Abstract: We report on direct writing of functional nanostructures of Co-C-O nanocomposites by use of the focused-electron-beam-induced deposition (FEBID) with the organometallic precursor Co-2(CO)(8). The magneto-transport properties and the quasi-static magnetization process of Co-C-O deposits were tuned upon ex-situ postannealing from room-temperature up to 300 degrees C under high-vacuum. The magnetic coercivity increasing by about 1 order of magnitude upon annealing is attributed to the domain wall pinning in the magnetization reversal process. In addition, the anisotropic magnetoresistance (AMR) of the annealed deposits reached around 1.8%, being among the highest values reported for FEBID materials. It is in the range of 20-110% larger than the AMR of pure Co thin films and nanowires, while about 176% larger compared to Co-C deposits grown by FEBID with higher metal content. The magnetotransport measurements reveal that the AMR is enhanced by the domain-wall magnetoresistance (DWMR) effect in the annealed deposits. The incorporation of graphitic carbon in ferromagnetic deposits is a key for significant improvements in the coercivity and the reversal fields, as well as the observed huge AMR values. It yields this material especially advantageous for potential applications in magnetic memory, high density magnetic recording, and room-temperature spintronic technology

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ

200864/2015-7

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

436573/2018-0

COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES

2017/10581-1

Fechado