Spin-Orbit Torque and Magnetic Damping in Tailored Ferromagnetic Bilayers

Dongjoon Lee, Jonghyuk Kim, Heegyum Park, Kyoung Jin Lee, Byeong Kwon Ju, Hyun Cheol Koo, Byoung Chul Min, Oukjae Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We study spin-orbit-torque-driven ferromagnetic resonance (FMR) in ferromagnetic (FM) bilayers, consisting of Co and permalloy (Py) sandwiched between Pt and MgO layers. We find that the FM layer in contact with the Pt layer dominantly determines the spin Hall angle, which is consistent with the spin-transparency model. By contrast, the FMR linewidths are considerably influenced not only by the spin-pumping effect across the Pt/FM interface but also by the spin relaxation such as two-magnon scattering at the FM/MgO interface. The Co/MgO interface leads to notably increased FMR linewidths, while the Py/MgO interface has less effect. The different contributions of each interface to the spin Hall angle and dissipation parameter suggest that the stack configuration of Pt/Co/Py/MgO requires less writing energy than Pt/Py/Co/MgO in spin-orbit-torque-driven magnetic switching. Our approach offers a practical method to optimize material parameters by engineering either interfaces in contact with the heavy metal or the oxide layer.

Original languageEnglish
Article number024029
JournalPhysical Review Applied
Volume10
Issue number2
DOIs
Publication statusPublished - 2018 Aug 21

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magnetic damping
torque
damping
orbits
Permalloys (trademark)
ferromagnetic resonance
magnetic switching
heavy metals
metal oxides
pumping
dissipation
engineering
oxides

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Spin-Orbit Torque and Magnetic Damping in Tailored Ferromagnetic Bilayers. / Lee, Dongjoon; Kim, Jonghyuk; Park, Heegyum; Lee, Kyoung Jin; Ju, Byeong Kwon; Koo, Hyun Cheol; Min, Byoung Chul; Lee, Oukjae.

In: Physical Review Applied, Vol. 10, No. 2, 024029, 21.08.2018.

Research output: Contribution to journalArticle

Lee, Dongjoon ; Kim, Jonghyuk ; Park, Heegyum ; Lee, Kyoung Jin ; Ju, Byeong Kwon ; Koo, Hyun Cheol ; Min, Byoung Chul ; Lee, Oukjae. / Spin-Orbit Torque and Magnetic Damping in Tailored Ferromagnetic Bilayers. In: Physical Review Applied. 2018 ; Vol. 10, No. 2.
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