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Article Dans Une Revue Physical Review Applied Année : 2020

Room temperature skyrmions at zero field in exchange bias ultrathin films

Philippe David
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Gilles Gaudin
Vincent Jacques
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Olivier Boulle

Résumé

We demonstrate that magnetic skyrmions with diameters around 60 nm can be stabilized at room temperature and zero external magnetic field in an exchange-biased Pt/Co/NiFe/IrMn multilayer stack. This is achieved through an advanced optimization of the multilayer stack composition in order to balance the different magnetic energies controlling the skyrmion size. Magnetic imaging is performed both with magnetic force microscopy and scanning Nitrogen-Vacancy magnetometry, the latter providing unambiguous measurements at zero external magnetic field. In such samples, we show that exchange bias provides an immunity of the skyrmion spin texture to moderate external magnetic field, in the tens of mT range, which is an important feature for applications as memory devices. These results establish exchange-biased multilayer stacks as a promising platform towards the effective realization of memory and logic devices based on magnetic skyrmions.
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Dates et versions

hal-02428517 , version 1 (08-06-2021)

Identifiants

Citer

K. Gaurav Rana, A. Finco, F. Fabre, S. Chouaieb, A. Haykal, et al.. Room temperature skyrmions at zero field in exchange bias ultrathin films. Physical Review Applied, 2020, 13 (4), pp.044079. ⟨10.1103/PhysRevApplied.13.044079⟩. ⟨hal-02428517⟩
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