Thursday, July 25, 2013

1307.6479 (N. Vernier et al.)

Measurement of magnetization using domain compressibility in CoFeB films
with perpendicular anisotropy

N. Vernier, J. P. Adam, S. Eimer, G. Agnus, T. Devolder, T. Hauet, B. Ockert, D. Ravelosona
We present a method to map the saturation magnetization of soft ultrathin films with perpendicular anisotropy, and we illustrate it to assess the compositional dependence of the magnetization of CoFeB(1 nm)/MgO films. The method relies on the measurement of the dipolar repulsion of parallel domain walls that define a linear domain. The film magnetization is linked to the field compressibility of the domain. The method also yields the minimal distance between two walls before their merging, which sets a practical limit to the storage density in spintronic devices using domain walls as storage entities.
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