Needle-like domain structure in Co films deposited on Mo (110)

作者：Tekielak M; Schaefer R; McCord J; Maziewski A^*; Zablotskii V; Baczewski L T; Wawro A

来源：Journal of Magnetism and Magnetic Materials, 2007, 316(2): 184-187.

DOI：10.1016/j.jmmm.2007.02.062

• ultrathin cobalt films
• domain structure
• domain vall
• coercivity field

Magnetization reversal processes and domain structures have been studied in Mo(1 1 0)/Co(0 0 0 1)/Au(1 1 1) structures grown by molecular beam epitaxy on monocrystalline (11-20) sapphire substrates. Wedge-shaped samples with different Co thickness gradients relative to the Mo [0 0 1] direction were fabricated. Observation of the domain structure was performed at room temperature using Kerr microscopy in a Co thickness range varying from 5 to 50 nm, where the magnetization is oriented in the plane of the sample. A Co thickness-dependent coercivity field was determined through analysis of the domain wall position during the reversal process. A preferential orientation of magnetic domain walls was found, with the domains being needle-like. The orientation, as well as the size of the needles, depends on the Co thickness and the orientation of the magnetic. eld applied in the sample plane.

• 出版日期2007-9