Temperature dependence of the coercive field in single-domain particle systems

Details Temperature dependence of the coercive field in single-domain particle systems Temperature dependence of the coercive field in single-domain particle systems

2003-10-25

arxiv.org/abs/cond-mat/0310604v2

Physics

Condensed Matter

Materials Science

7 pages, 8 figures, revised version, accepted to Physical Review B on 29/04/2004

Scientific paper

10.1103/PhysRevB.70.014419

The magnetic properties of Cu97Co3 and Cu90Co10 granular alloys were measured over a wide temperature range (2 to 300K). The measurements show an unusual temperature dependence of the coercive field. A generalized model is proposed and explains well the experimental behavior over a wide temperature range. The coexistence of blocked and unblocked particles for a given temperature rises difficulties that are solved here by introducing a temperature dependent blocking temperature. An empirical factor gamma arise from the model and is directly related to the particle interactions. The proposed generalized model describes well the experimental results and can be applied to other single-domain particle system.

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