The 5 and 300 K hysteresis loops measured after 10 kOe magnetic field cooled. Panels (a), (b), (c), and (d) are the as-synthesized, the 2-h annealed, the 4-h annealed, and the 6-h annealed nanowires, respectively. Inset displays detailed MH curves in low magnetic fields.
Cao et al. Nanoscale Research Letters 2013 8:423 doi:10.1186/1556-276X-8-423