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Manipulation magnétoélectrique de parois de domaine transverses dans des nanostructures magnétoélastiques

Abstract : The manipulation of magnetic domain walls – that separate regions of uniform magnetization – is associated with both fundamental and technological research interests. A large part of the literature on domain wall motion deals with the use of magnetic fields and electric currents. However, several concerns – most notably energy dissipation – motivates the search for alternatives. Among potential candidates, the mechanical stress-mediated magnetoelectric coupling in magnetoelastic/piezoelectric heterostructures seems promising. In this thesis, it is shown that the combination of a bias magnetic field and uniform mechanical stress can induce unidirectional domain wall motion in nanostructures with uniaxial anisotropy. Static and dynamic aspects of this phenomenon are studied by means of ad hoc numerical procedures simulating the mechanical coupling of 011-cut PMN-PT generating the stress, and TbCo2/FeCo multilayers magnetoelastic nanostructures. The design of the cross section profile in nanostructures allows to tailor the response of the system, enabling for instance the control of domain wall position in confined geometries. The associated dynamics stands apart from known regimes because of the shape of the domain wall. The existence of steady-state regimes in nanostripes of constant width shows that velocities comparable to those of other techniques can be obtained, for a fraction of the energy required. Experimental investigations resulted in the development of a successful fabrication process on PMN-PT and the exploration of the magnetoelectric effect
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Submitted on : Thursday, May 3, 2018 - 4:10:10 PM
Last modification on : Monday, March 2, 2020 - 1:38:07 PM
Long-term archiving on: : Tuesday, September 25, 2018 - 9:09:26 PM

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  • HAL Id : tel-01784606, version 1

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Théo Mathurin. Manipulation magnétoélectrique de parois de domaine transverses dans des nanostructures magnétoélastiques. Micro and nanotechnologies/Microelectronics. Ecole Centrale de Lille, 2017. English. ⟨NNT : 2017ECLI0014⟩. ⟨tel-01784606⟩

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