Exploring the microscopic origin of magnetic anisotropies with X-ray magnetic circular dichroism (XMCD) spectroscopy

The creation of practical devices based on magnetic skyrmions depends on the development of methods to create and control stable individual skyrmions. Here, the authors present a bilayer device that uses dipolar interactions to stabilize skyrmions that can be manipulated…

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Current-induced skyrmion generation and dynamics in symmetric bilayers.

Domain structure and magnetization reversal of antiferromagnetically coupled perpendicular anisotropy films

Interlayer Exchange Coupling

Magnetic superlattices and multilayers

The first direct evidence of oscillatory coupling in Co/Au(111)/Co trilayers grown in ultrahigh vacuum is reported. For samples with identical cobalt layer thicknesses, up to three peaks of magnetoresistance, corresponding to antiferromagnetic coupling between the cobalt layers, are observed with increasing gold spacer layer thickness, t Au . By growing trilayers with different cobalt coercive fields, a direct measurement of both ferromagnetic and antiferromagnetic coupling as a function of t Au was possible. The experimental data are in good agreement with theoretical predictions

Unambiguous evidence of oscillatory magnetic coupling between Co layers in ultrahigh vacuum grown Co/Au(111)/Co trilayers.

Magnetoresistance (MR) measurements have been performed on Fe/Au/Co and ${\mathrm{Fe}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{V}}_{\mathit{x}}$/Au/Co trilayers with perpendicular orientation of the magnetization of the thin ferromagnetic layers. While the MR is larger for an antiparallel arrangement of the magnetizations than for a parallel one in Fe/Au/Co (the usual spin-valve-type MR), an inverse spin-valve effect is observed in ${\mathrm{Fe}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{V}}_{\mathit{x}}$/Au/Co. This inverse MR is attributed to an increase of the density of states at the Fermi level for majority-spin electrons when Fe is alloyed with V.

E. Kolb

Papers

Unambiguous evidence of oscillatory magnetic coupling between Co layers in ultrahigh vacuum grown Co/Au(111)/Co trilayers.

Inverse magnetoresistance in the simple spin-valve system Fe1-xVx/Au/Co.

X-ray circular dichroism of thin Fe0.82V0.18 interlayers in Au(111)

Magnetoresistance study of granular behaviour in Co / Au(111) ultrathin films

Magnetoresistance of cobaltgold multilayers with an increasing number of periods