Abstract
The interlayer coupling in a Fe(100 Å)/Cr(0–22.5 Å)/Fe(100 Å) sample with a wedge-type chromium spacer was investigated as a function of chromium thickness and temperature. Two experimental methods were used for the interlayer coupling determination: the static magnetization curves of the sample were measured by means of the magneto-optical Kerr effect (MOKE) technique in the 77–473 K temperature range, and the Mandelstam–Brillouin light scattering (MBLS) experiments were performed to measure the spin-wave spectra of the sample at room temperature. The data obtained via two methods can be well described in the frame of the biquadratic coupling model and are in a good agreement with each other. The bilinear coupling oscillates with the chromium spacer thickness having a period of two monolayers (in agreement with the known experimental results). The biquadratic coupling constant J 2 decays with the increase of the spacer thickness monotonically, showing a 1/ t Cr behaviour at all temperatures. The bilinear coupling temperature dependence is very weak and could not be distinguished within our experimental accuracy, while the biquadratic coupling demonstrates a relatively strong temperature dependence, which can be considered as linear.
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