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Article Dans Une Revue Advanced Electronic Materials Année : 2022

Mechanism of Spin‐Orbit Torques in Platinum Oxide Systems

Jayshankar Nath
Alexandru Vladimir Trifu
  • Fonction : Auteur
Mihai Sebastian Gabor
  • Fonction : Auteur
Ali Hallal
  • Fonction : Auteur
Stephane Auffret
  • Fonction : Auteur
Aymen Mahjoub
  • Fonction : Auteur
Edmond Chan
  • Fonction : Auteur
Avinash Kumar Chaurasiya
  • Fonction : Auteur
Amrit Kumar Mondal
  • Fonction : Auteur
Haozhe Yang
  • Fonction : Auteur
Eva Schmoranzerova
  • Fonction : Auteur
Mohamed Ali Nsibi
  • Fonction : Auteur
Isabelle Joumard
  • Fonction : Auteur
Anjan Barman
  • Fonction : Auteur
Mairbek Chshiev
  • Fonction : Auteur
Gilles Gaudin
  • Fonction : Auteur
Ioan Mihai Miron
  • Fonction : Auteur

Résumé

Abstract Spin‐Orbit Torque (SOT) Magnetic Random‐Access Memories (MRAM) have shown promising results toward the realization of fast, non‐volatile memory systems. Oxidation of the heavy‐metal (HM) layer of the SOT‐MRAM has been proposed as a method to increase its energy efficiency. But the results are widely divergent due to the difficulty in controlling the HM oxidation because of its low enthalpy of formation. Here, these differences are reconciled by performing a gradual oxidation procedure, which allows correlating the chemical structure to the physical properties of the stack. As an HM layer, Pt is chosen because of the strong SOT and the low enthalpy of formation of its oxides. The evidence of an oxide inversion layer at the ferromagnet (FM)/HM interface is found: the oxygen is drawn into the FM, while the HM remains metallic near the interface. Moreover, the oxygen migrates in the volume of the FM layer rather than being concentrated at the interface. Consequently, it is found that the intrinsic magnitude of the SOT is unchanged compared to the fully metallic structure. The previously reported apparent increase of SOTs is not intrinsic to platinum oxide and instead arises from systemic changes produced by oxidation.

Dates et versions

hal-04222318 , version 1 (29-09-2023)

Identifiants

Citer

Jayshankar Nath, Alexandru Vladimir Trifu, Mihai Sebastian Gabor, Ali Hallal, Stephane Auffret, et al.. Mechanism of Spin‐Orbit Torques in Platinum Oxide Systems. Advanced Electronic Materials, 2022, 8 (7), ⟨10.1002/aelm.202101335⟩. ⟨hal-04222318⟩
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