Room-temperature ferroelectric control of spin-to-charge conversion in GeTe

Sara Varotto; Luca Nessi; Stefano Cecchi; Jagoda Slawinska; Paul Noël; Federico Fagiani; Matteo Cantoni; Marcio Costa; Raffaella Calarco; Marco Buongiorno Nardelli; Manuel Bibes; Silvia Picozzi; Jean-Philippe Attané; Laurent Vila; Riccardo Bertacco; Christian C. Rinaldi

doi:10.1117/12.2596102

1 August 2021 Room-temperature ferroelectric control of spin-to-charge conversion in GeTe

Sara Varotto, Luca Nessi, Stefano Cecchi, Jagoda Slawinska, Paul Noël, Federico Fagiani, Matteo Cantoni, Marcio Costa, Raffaella Calarco, Marco Buongiorno Nardelli, Manuel Bibes, Silvia Picozzi, Jean-Philippe Attané, Laurent Vila, Riccardo Bertacco, Christian C. Rinaldi

Author Affiliations +

Proceedings Volume 11805, Spintronics XIV; 118052A (2021) https://doi.org/10.1117/12.2596102
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

Abstract

Since the 1980s, the generation and detection of spin currents has relied on ferromagnets. Their switching today relies on spin-orbit torque from heavy metals. Nevertheless, spin injection in semiconductors has rather low efficiency. Ferroelectric Rashba semiconductors (FERSC) [1,2] may constitute a new paradigm for semiconductor spintronics, thanks to the combination of semiconductivity, large spin-orbit interaction, and the non-volatility provided by ferroelectricity. Here we report the room-temperature ferroelectric switching of spin-to-charge conversion in epitaxial GeTe films. We first show that ferroelectricity in GeTe can be reversed by electrical gating despite its high carrier density. Then, we reveal a spin-to-charge conversion as effective as in Pt, but whose sign switches with the ferroelectric polarization. These results open a route towards devices combining spin-logic and memory integrated into a silicon-compatible material.

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Sara Varotto, Luca Nessi, Stefano Cecchi, Jagoda Slawinska, Paul Noël, Federico Fagiani, Matteo Cantoni, Marcio Costa, Raffaella Calarco, Marco Buongiorno Nardelli, Manuel Bibes, Silvia Picozzi, Jean-Philippe Attané, Laurent Vila, Riccardo Bertacco, and Christian C. Rinaldi "Room-temperature ferroelectric control of spin-to-charge conversion in GeTe", Proc. SPIE 11805, Spintronics XIV, 118052A (1 August 2021); https://doi.org/10.1117/12.2596102

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