Probing current-induced magnetic fields in Au|YIG heterostructure with low-energy muon spectroscopy

Abstract

We investigated the depth dependence of current-induced magnetic fields in a bilayer of a normal metal (Au) and a ferrimagnetic insulator (Yttrium Iron Garnet - YIG) by using low energy muon spectroscopy (LE-muSR). This allows us to explore how these fields vary from the Au surface down to the buried Au|YIG interface, which is relevant to study physics like the spin-Hall effect. We observed a maximum shift of 0.4 G in the internal field of muons at the surface of Au film which is in close agreement to the value expected for Oersted fields. As muons are implanted closer to the Au|YIG interface the shift is strongly suppressed, which we attribute to the dipolar fields present at the Au|YIG interface. Combining our measurements with modelling, we show that dipolar fields caused by the finite roughness of the Au|YIG interface consistently explains our observations. Our results, therefore, gauge the limits on the spatial resolution and the sensitivity of LE-muSR to the roughness of the buried magnetic interfaces, a prerequisite for future studies addressing current induced fields caused by the spin-Hall effect.

arXiv comment5 pages, 4 figures

References in corpus (16)

• Spin Caloritronics
• Experimental observation of the spin-Hall effect in a two dimensional spin-orbit coupled semiconductor system
• Spin Hall Magnetoresistance Induced by a Non-Equilibrium Proximity Effect
• Electron spin relaxation by nuclei in semiconductor quantum dots
• Detection and quantification of inverse spin Hall effect from spin pumping in permalloy/normal metal bilayers
• Spin-Hall Magnetoresistance in Platinum on Yttrium Iron Garnet: Dependence on platinum thickness and in-plane/out-of-plane magnetization
• Spin precession and inverted Hanle effect in a semiconductor near a finite-roughness ferromagnetic interface
• Simultaneous detection of the spin-Hall magnetoresistance and the spin-Seebeck effect in Platinum and Tantalum on Yttrium Iron Garnet
• Manipulation of the Spin Memory of Electrons in n-GaAs
• Dynamical Nuclear Polarization by Electrical Spin Injection in Ferromagnet-Semiconductor Heterostructures
• Surface sensitivity of the spin Seebeck effect
• Direct observation of non-local effects in a superconductor
• Direct spectroscopic observation of a shallow hydrogen-like donor state in insulating SrTiO${}_3$
• Spin-lattice coupling induced weak dynamical magnetism in EuTiO_3 at high temperatures
• Determination of the zero-field magnetic structure of the helimagnet MnSi at low temperature
• Optical Orientation in Ferromagnet/Semiconductor Hybrids