Effect of temperature on the exchange bias in naturally oxidized Ni Co1− (x= 0.2) nanowires fabricated by electrochemical deposition technique

Tunable High-Field Magnetization in Strongly Exchange-Coupled Freestanding Co/CoO Core/Shell Coaxial Nanowires

“…[2][3][4]7 It is worth mentioning that due to its large exchange coupling the Co/CoO system has been used as a reference material in exchange bias studies in thin films, lithographed structures or core/shell nanoparticle or nanowires. [1][2][3][4][7][8][9][10][11][12][13] Remarkably, compared to the existing literature on exchange biased thin films [2][3][4] and isotropic bi-magnetic core/shell nanoparticles, 7,14 the amount of studies dealing with exchange biased anisotropic nanostructures (i.e., rods, nanowires) is relatively scarce. [15][16][17] Nonetheless, interesting new phenomena arising from the competition between shape anisotropy and exchange bias may be anticipated in these structures, thus providing an extra degree of freedom to enhance the current functionalities of these materials while adding large potential for novel, unforeseen, applications.…”

“…Remarkably, compared to the existing literature on exchange biased thin films , and isotropic bimagnetic core/shell nanoparticles, , the amount of studies dealing with exchange biased anisotropic nanostructures (i.e., rods and nanowires) is relatively scarce. − Nonetheless, interesting new phenomena arising from the competition between shape anisotropy and exchange bias may be anticipated in these structures, thus providing an extra degree of freedom to enhance the current functionalities of these materials while adding large potential for novel, unforeseen applications.…”

“…Even though there exist some studies of bimagnetic coaxial nanowires where the core and shell are grown independently (thus allowing different combinations of FM, ferrimagnetic (FiM), and AFM cores and shells), ,,− partial oxidation of FM transition-metal nanowires (Fe, Co, Ni, and their alloys) offers a fast and simple process to obtain bimagnetic coaxial nanowires in a controlled manner. In this case, the core is FM, and the corresponding shell is either AFM or FiM. − ,,− The exchange coupling between the FM core and the AFM or FiM shell gives rise to phenomena similar to the ones observed in thin films and nanoparticles, e.g., loop shifts and coercivity enhancement. − ,,− However, new effects could emerge if the exchange coupling is induced in such a way that it directly competes with the shape anisotropy.…”