Volume 49, Number 4, February II 2000
|Page(s)||528 - 533|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Inverse giant magnetoresistance in rare-earth/transition metal multilayers
E. C. Stoner Laboratory, Department of Physics
and Astronomy University of Leeds -
Leeds, LS2 9JT, UK
2 ISIS, Rutherford Appleton Laboratory - Chilton, Didcot, Oxon, OX11 0QX, UK
Accepted: 3 December 1999
Giant magnetoresistance (GMR) is observed in multilayered structures with 3d ferromagnetic layers separated by normal metal spacer layers, and is usually a negative magnetoresistance. No GMR has been observed to date in multilayers with solely 4f ferromagnetic layers. Nevertheless, in a hybrid 3d/4f magnetic multilayer of the form an inverse GMR of up to has been measured at 4.2 K. This effect is explained in terms of a spin-engineered configuration of layers which forces the moments of adjacent Co layers to be anti-parallel in a high-field state, and parallel in a low-field state. Since the structure is formed from separate magnetic layers, it has been shown, by varying the order of the layers, that Co/Cu interfaces are essential to the GMR in these types of structures. Although there is no GMR in rare-earth/non-magnetic multilayers, the Dy layers are sufficiently transparent to electrons for the GMR to continue rising as the number of repeat units is increased, up to N = 4.
PACS: 75.70.Pa – Giant magnetoresistance / 71.20.Eh – Rare earth metals and alloys / 71.20.Be – Transition metals and alloys
© EDP Sciences, 2000
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