期刊
NANOTECHNOLOGY
卷 25, 期 47, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/25/47/475702
关键词
nanowires; single crystal cobalt; self-assembled nanostructures; electron microscopy; magnetocrystalline anisotropy; micromagnetics
资金
- Spanish Ministry of Science and Innovation, MCINN [MAT2010-20798C05-01, FIS2010-20979-C02-02]
- Basque Government [CTP11-P14, IE11-304]
- SABIC
- Far Eastern Federal University
Cobalt nanowires, 40 nm in diameter and several micrometers long, have been grown by controlled electrodeposition into ordered anodic alumina templates. The hcp crystal symmetry is tuned by a suitable choice of the electrolyte pH (between 3.5 and 6.0) during growth. Systematic high resolution transmission electron microscopy imaging and analysis of the electron diffraction patterns reveals a dependence of crystal orientation from electrolyte pH. The tailored modification of the crystalline signature results in the reorientation of the magnetocrystalline anisotropy and increasing experimental coercivity and squareness with decreasing polar angle of the 'c' growth axis. Micromagnetic modeling of the demagnetization process and its angular dependence is in agreement with the experiment and allows us to establish the change in the character of the magnetization reversal: from quasi-curling to vortex domain wall propagation modes when the crystal 'c' axis tilts more than 75 degrees in respect to the nanowire axis.
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