The spin Hall magnetoresistance (SMR) of Pt/FeCoB bilayers with in-plane magnetocrystalline anisotropy was analyzed with respect to a second-order effect in the sensing current, which acts, through the spin Hall effect in Pt, as a torque on the magnetization of the ferromagnetic (FM) layer and changes slightly its configuration. This leads to a small current-dependent shift of the SMR curves in field that allows, in structures with a multidomain state (e.g., Hall bars), the determination of the sign of the magnetic remanence. The SMR measurements were performed as a function of the Pt thickness and the spin Hall angle, and the diffusion length and the field-like and damping-like spin–orbit-torque (SOT) efficiency were determined. The results were compared with the values obtained from harmonic Hall voltage and SOT-FM resonance (FMR) measurements and show a good agreement.

Spin Hall Magnetoresistance and Spin–Orbit Torque Efficiency in Pt/FeCoB Bilayers / Magni, Alessandro; Basso, Vittorio; Sola, Alessandro; Soares, Gabriel; Meggiato, Nicola; Kuepferling, Michaela; Skowronski, Witold; Lazarski, Stanislaw; Grochot, Krzysztof; Khanjani, Mehran Vafaee; Langer, Juergen; Ocker, Berthold. - In: IEEE TRANSACTIONS ON MAGNETICS. - ISSN 0018-9464. - 58:2(2022), pp. 1-5. [10.1109/TMAG.2021.3084866]

Spin Hall Magnetoresistance and Spin–Orbit Torque Efficiency in Pt/FeCoB Bilayers

Magni, Alessandro;Basso, Vittorio;Sola, Alessandro;Soares, Gabriel;Kuepferling, Michaela
;
2022

Abstract

The spin Hall magnetoresistance (SMR) of Pt/FeCoB bilayers with in-plane magnetocrystalline anisotropy was analyzed with respect to a second-order effect in the sensing current, which acts, through the spin Hall effect in Pt, as a torque on the magnetization of the ferromagnetic (FM) layer and changes slightly its configuration. This leads to a small current-dependent shift of the SMR curves in field that allows, in structures with a multidomain state (e.g., Hall bars), the determination of the sign of the magnetic remanence. The SMR measurements were performed as a function of the Pt thickness and the spin Hall angle, and the diffusion length and the field-like and damping-like spin–orbit-torque (SOT) efficiency were determined. The results were compared with the values obtained from harmonic Hall voltage and SOT-FM resonance (FMR) measurements and show a good agreement.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/72836
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