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Exchange bias in Co/MnPd SYSTEM

Abstract : This thesis concerns the study of Co/MnPd an exchange-biased system.
The samples were structurally characterised using X-ray diffraction and reflectometry and magnetically VSM and SQUID magnetic measurements.
In view of approaching the physical understanding of exchange-bias, a simple phenomenological model of exchange-bias was developed, in which the interfacial molecular field created by the ferromagnet on the antiferromagnet is essentially equivalent to an external applied field. A striking feature is to show that the HE field is determined by the coupling existing between the first and the second antiferromagnetic layers. Exchange bias fields which are consistent with experimental values are then obtained.
Magnetic after effect was studied in great detail for the first time in an exchange -bias system. We showed that the Fatuzzo-Labrune model permits thermal activation to be described along the first branch of the hysteresis cycle. This implies that reversal is governed by nucleation over a very small number of barriers. Along the second and further branches of the hysteresis cycle magnetization reversal involve overcoming of energy barriers which are characterised by a broad energy distribution so that the models which are usually used to describe magnetization reversal in hard magnetic materials are now adequate.
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Contributor : Cristina Claudia Macovei <>
Submitted on : Monday, June 30, 2008 - 5:58:17 PM
Last modification on : Thursday, November 19, 2020 - 1:00:56 PM
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  • HAL Id : tel-00292241, version 1




Cristina Claudia Macovei. Exchange bias in Co/MnPd SYSTEM. Condensed Matter [cond-mat]. Université Joseph-Fourier - Grenoble I, 2008. English. ⟨tel-00292241⟩



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