Low spin-polarization in the heavy metal\ferromagnet structures detected through the domain wall motion by synchronized magnetic field and current

Abstract : CoFeB is a very soft material, in which Domain Wall (DW) can be moved easily under a weak magnetic field. However, it is very difficult to move DWs in Ta\CoFeB\MgO nanowires with interfacial perpendicular magnetic anisotropy through a spin-polarized current, and this limits the perspectives of racetrack memory driven by the current-in-plane mechanism. To investigate this phenomenon, we performed experiments of DW velocity measurement by applying a magnetic field and a current simultaneously. Working in the precessional regime, we have been able to see a very important effect of the spin-polarized current, which allows evaluating the polarization rate of the charge carriers. An unexpected quite low spin polarization rate down to 0.26 have been obtained, which can explain the low efficiency of DW motion induced by the spin-polarized current. Possible reasons for this low rate are analyzed, such as the spin relaxation in the Ta layer.
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https://hal.archives-ouvertes.fr/hal-02042462
Contributor : Laurent Vila <>
Submitted on : Wednesday, February 20, 2019 - 2:20:32 PM
Last modification on : Thursday, April 4, 2019 - 9:44:03 AM

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  • HAL Id : hal-02042462, version 1
  • ARXIV : 1901.09256

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Xueying Zhang, Nicolas Vernier, Laurent Vila, Shaohua Yan1, Zhiqiang Cao, et al.. Low spin-polarization in the heavy metal\ferromagnet structures detected through the domain wall motion by synchronized magnetic field and current. 2019. ⟨hal-02042462⟩

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