Field-dependent magnetic domain structure in antiferromagnetically coupled multilayers by polarized neutron scattering

摘要: We study the magnetic structure of antiferromagnetically (AF) coupled $\mathrm{Co}∕\mathrm{Cu}$ multilayers (MLs) with 10 or 40 bilayers under influence an external field by polarized neutron scattering in specular and off-specular geometry. observe spin-flip channels intensities around $\frac{1}{2}$-order Bragg position. Based on simulations measured data within distorted-wave Born approximation we find vertically correlated domains, their domain size evolves for a sufficiently large number along ML stack. Small domains most likely at top presumably bottom coexist single ML. The small gradually get aligned applied direction $0.5\phantom{\rule{0.3em}{0ex}}\mathrm{kOe}$, whereas bigger remain AF up to $3.0\phantom{\rule{0.3em}{0ex}}\mathrm{kOe}$, which is well above apparent saturation conventional magnetometry methods. Moreover, double-peak position MLs ten as bilayers.