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An extraordinary chiral exchange-bias phenomenon: engineering the sign of the bias field in orthogonal bilayers by a magnetically switchable response mechanism

Abstract : Isothermal tuning of both the magnitude and the sign of the bias field has been achieved by exploiting a new phenomenon in a system consisting of two orthogonally coupled films: SmCo5 (out-of-plane anisotropy)-CoFeB (in-plane anisotropy). This has been managed by using the large dipolar magnetic field of the SmCo5 layer resulting in pinning one of the branches of the hysteresis loop (either the ascending or the descending branch) at a fixed field value while the second one is modulated along the field axis by varying the orientation of an externally applied magnetic field. This means the possibility of controlling the sign of the bias field in a manner not reported to date. Moreover, modulation of the bias field strength is possible by varying the thickness of a spacer between the SmCo5 and CoFeB layers. This study shows that the observed phenomena find their origin in the competition of artificially induced anisotropies on both layers, resulting in a reversible chiral bias effect that allows selecting the initial sign of the bias field by switching (upwards/downwards) the magnetization in the SmCo5 film.
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Submitted on : Friday, October 30, 2020 - 4:21:27 PM
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Alberto Bollero, Volker Neu, Vincent Baltz, David Serantes, José Luis F Cuñado, et al.. An extraordinary chiral exchange-bias phenomenon: engineering the sign of the bias field in orthogonal bilayers by a magnetically switchable response mechanism. Nanoscale, Royal Society of Chemistry, 2020, 12, pp.1155. ⟨10.1039/x0xx00000x⟩. ⟨hal-02984084⟩

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