Abstract
We have studied the magnetic field dependences of the real ( χ) and imaginary ( χ′) contributions to the low-frequency magnetic susceptibility in epitaxial antiferromagnetically coupled [Fe(Cr(1 0 0)] n ( n=10–50) multilayers. For the magnetic field directed along (1 1 0), the magnetic susceptibility shows on orientation phase transition. For the magnetic field either along the easy or the hard axes we observe a strong enhancement of the χ′( H) (i.e. magnetic losses) at low magnetic fields ( H<50 Oe), which we relate to AC field-induced domain wall movement. This response is strongly dependent on frequency and temperature.
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