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Dynamics of magnetization in nanoparticles

Project information

Grant agreement ID: INTAS-2001-02341

  • Start date

    1 June 2002

  • End date

    31 May 2005

Funded under:

IC-INTAS

Coordinated by:

University of Dublin

Ireland

Objective

Nanoparticles are small systems with challenging physical properties such as slow exponential relaxation at low temperatures (relaxation times extending up to geological time scales) and superparamagnetism (where the relaxation time may be of the order of picoseconds) at high temperatures. From a technological point of view, they have applications in magnetic storage of information. In order to reach high storage densities very small particles are needed. However, in small nanoparticles thermal fluctuations of magnetization and surface effects become of great importance as they dominate the magnetic properties, which control the relaxation time and therefore the stability of the information stored. Therefore, one of the ultimate goals of theoretical as well as experimental studies on nanoparticles, in view of technological applications, consists in dealing with the various effects (thermal, surface, inter-particle interactions) on the relaxation time of the particle magnetization.

In this project, we would like to investigate these effects by using microscopic approaches. First, the approach to solve the underlying stochastic Langevin equation for the magnetization (e.g. Gilbert's equation augmented by a random field term) developed in previous works of the participants of this project will be the basis for further extensions and generalizations. Second, the relaxation rate for nanoparticles will be calculated using Langer's kinetic theory and Monte-Carlo simulations. This work will be useful to interpret the experimental results for the magnetic relaxation of nanoparticles and will have great technological implications.

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Coordinator

University of Dublin

Address

Ireland

Participants (5)

Queen's University of Belfast

United Kingdom

Russian Academy of Sciences

Russia

Université de Perpignan

France

Université de Versailles St. Quentin

France

Ural Branch of the Russian Academy of Sciences

Russia

Project information

Grant agreement ID: INTAS-2001-02341

  • Start date

    1 June 2002

  • End date

    31 May 2005

Funded under:

IC-INTAS

Coordinated by:

University of Dublin

Ireland