Temperature-induced reversal of magnetic interlayer exchange coupling

Details Temperature-induced reversal of magnetic interlayer exchange coupling Temperature-induced reversal of magnetic interlayer exchange coupling

2007-12-19

arxiv.org/abs/0712.3122v2

Phys. Rev. Lett. 100, 227203 (2008)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures; accepted version; minor changes and new Figs. 2 and 4 containing more data

Scientific paper

10.1103/PhysRevLett.100.227203

For epitaxial trilayers of the magnetic rare-earth metals Gd and Tb, exchange coupled through a non-magnetic Y spacer layer, element-specific hysteresis loops were recorded by the x-ray magneto-optical Kerr effect at the rare-earth $M_5$ thresholds. This allowed us to quantitatively determine the strength of interlayer exchange coupling (IEC). In addition to the expected oscillatory behavior as a function of spacer-layer thickness $d_Y$, a temperature-induced sign reversal of IEC was observed for constant $d_Y$, arising from magnetization-dependent electron reflectivities at the magnetic interfaces.

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