Spin transport and magnetic proximity effect in CoFeB/normal metal/Pt trilayers

Abstract

We present a study of the damping and spin pumping properties of CoFeB/X/Pt systems with $\mathrm{X}=\mathrm{Al},\mathrm{Cr}$ and $\mathrm{Ta}$. We show that the total damping of the CoFeB/Pt systems is strongly reduced when an interlayer is introduced independently of the material. Using a model that considers spin relaxation, we identify the origin of this contribution in the magnetically polarized Pt formed by the magnetic proximity effect (MPE), which is suppressed by the introduction of the interlayer. The induced ferromagnetic order in the Pt layer is confirmed by transverse magneto-optical Kerr spectroscopy at the M${}_{2,3}$ and N${}_7$ absorption edges as an element-sensitive probe. We discuss the impact of the MPE on parameter extraction in the spin transport model.

References in corpus (6)

• Direct electronic measurement of the spin Hall effect
• Phase-Matched Generation of Coherent Soft-X-Rays
• Temperature dependence of spin diffusion length and spin Hall angle in Au and Pt
• Enhancement of spin transparency by interfacial alloying
• Spin-Scattering Rates in Metallic Thin Films Measured by Ferromagnetic Resonance Damping Enhanced by Spin-Pumping
• Magnetic Proximity Effect in Pt/CoFe2O4 Bilayers

Cited by in corpus (1)

• Observation by SANS and PNR of pure Néel-type domain wall profiles and skyrmion suppression below room temperature in magnetic [Pt/CoFeB/Ru]${}_{10}$ multilayers