Abstract
Two La x Mn1−x O y (LM1, LM2) and three La x Fe1−x O y (LF1, LF2, LF3) amorphous nanowire arrays (NWAs) were prepared by chemical co-precipitation in anodic aluminium oxide (AAO) templates. The concentration of the reactant plays a crucial role in determining the morphology of La x Mn1−x O y NWAs. The AAO template was etched using a mixed nitrate solution that led to the exposure of La x Fe1−x O y NWAs on the template surface in the process of preparation, then the length of nanowires exposed to the template depends on the etching time. The LM2 NWAs exhibited obvious magnetic anisotropy after the template is almost eliminated by etching with NaOH solution, while the magnetic anisotropy of La x Fe1−x O y NWAs was manipulated by the length of nanowires outside the template. There is a regular change in the coercive force H c and remanence ratio M r/M s with increasing length of nanowires outside the template. Therefore, the nanoarray materials with tunable magnetic anisotropy were obtained by controllable preparation, and they can be applied to high-density magnetic memory nano-devices.
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