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Elaboration and Characterization of Cu/Co Multilayered Nanowires
Julien Bran,Malick Jean,Rodrigue Lard´e,Xavier Sauvage,Jean-Marie Le Breton,Alain Pautrat 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Multilayered Cu/Co nanowires were elaborated by a low cost electrochemical technique consistingin reducing alternatively the Cu2+ and Co2+ ions, through a porous commercial anodic aluminumoxide template, onto a conductive substrate. The deposition parameters were determined fromcurrent-potential curves. The structure of the nanowires was characterized down to the atomicscale by transmission electron microscopy and atom probe tomography. The results show that themultilayers are polycrystallized with a nanometric grain size. The Cu layers are almost pure, whilethe Co ones consist in a Co-rich alloy with about 12 to 15% Cu.
Georgia C. Papaefthymiou,Arthur J. Viescas,Jean-Marie Le Breton,Hubert Chiron,Jean Juraszek,Tae-Jin Park,Stanislaus S. Wong 한국물리학회 2015 Current Applied Physics Vol.15 No.3
Magnetic and Mössbauer characterization of single crystalline, sub-micron sized Bi2Fe4O9 cubes has been performed using SQUID magnetometry and transmission Mössbauer spectroscopy in the temperature range of 4.2 K ≤ T ≤ 300 K. A broad magnetic phase transition from the paramagnetic to the antiferromagnetic state is observed below 250 K, with the Mössbauer spectra exhibiting a superposition of magnetic, collapsed and quadrupolar spectra in the transition region of 200 K < T < 245 K. Room temperature Mössbauer spectra obtained in transmission geometry are identical to those recorded in back-scattering geometry via conversion electron Mössbauer spectroscopy, indicating the absence of strain at the surface. A small hysteresis loop is observed in SQUID measurements at 5 K, attributable to the presence of weak-ferromagnetism arising from the canting of Fe3+ ion sublattices in the antiferromagnetic matrix.