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Kerr effect transformation caused by proximity effect in bilayer structures of magnetic and nonmagnetic transition metals
Russian version
Skidanov V. A.1
1National Research Center “Kurchatov Institute”, Moscow, Russia
Email: skidanov@ippm.ru
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Hysteresis loops in a low-frequency alternating magnetic field in films of nonmagnetic transition metals deposited on the surface of a ferromagnetic metal have been experimentally observed using the magneto-optical transverse Kerr effect. The shape of the hysteresis is identical to the shape of the loops from the ferromagnetic layer and is observed in films of normal metals, even when their thickness h significantly exceeds the depth of light penetration. The dependence of the Kerr signal on the thickness h of a non-magnetic metal is alternating and varies depending on the composition of the ferromagnetic. Experimental data allow estimating the length of spin diffusion in tantalum for unexcited electrons - λsf=50±10 nm, which is 2-4 times the depth of light penetration into transition metals. The observed effect decreases with electron filling of the outer d-shell of a normal metal (d2->d9) and disappears in metals with an empty or completely filled d-shell. Films of Al (3d0), Cu (3d10) and Au (5d10) on the surface of a ferromagnetic metal have only a shielding effect. The Kerr signal from a ferromagnetic metal film also changes in the presence of a normal metal sublayer and can be amplified several times. Keywords: phenomena caused by proximity effect, transverse Kerr effect, spin diffusion, hysteresis loop.
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