Probing the Spin Pumping Mechanism: Exchange Coupling with Exponential Decay in Y3Fe5O12/barrier/Pt Heterostructures

Abstract

Ferromagnetic resonance driven spin pumping of pure spin currents from a ferromagnet into a nonmagnetic material promises new spin-functional devices with low energy consumption. The mechanism of spin pumping is under intense investigation and it is widely believed that exchange interaction between the ferromagnet and nonmagnetic material is responsible for this phenomenon. We observe a thousand-fold exponential decay of the spin pumping from 20-nm thick Y3Fe5O12 films to platinum across insulating barriers, from which the exponential decay lengths of 0.16 and 0.23 nm are extracted for oxide barriers with band gaps of 4.93 eV and 2.36 eV, respectively. This prototypical signature of quantum tunneling through a barrier underscores the importance of exchange coupling for spin pumping and reveals its dependence on the characteristics of the barrier material.

19 papges, 5 figures

References in corpus (3)

• Direct electronic measurement of the spin Hall effect
• Electrical detection of spin pumping due to the precessing magnetization of a single ferromagnet
• Large Spin Pumping from Epitaxial Y3Fe5O12 Thin Films to Pt and W Layers

Cited by in corpus (35)

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• Surface state dominated spin-charge current conversion in topological insulator/ferromagnetic insulator heterostructures
• Conduction of spin currents through insulating oxides
• Strain-Tunable Magnetocrystalline Anisotropy in Epitaxial Y3Fe5O12 Thin Films
• Enhanced DC Spin Pumping into a Fluctuating Ferromagnet near Tc
• Spin Transport in Antiferromagnetic Insulators Mediated by Magnetic Correlations
• Spin Seebeck effect through antiferromagnetic NiO
• Measurement of spin pumping voltage separated from extrinsic microwave effects
• Enhancement of Pure Spin Currents in Spin Pumping Y3Fe5O12/Cu/metal Trilayers through Spin Conductance Matching
• Off-Resonant Manipulation of Spins in Diamond via Precessing Magnetization of a Proximal Ferromagnet
• Y3Fe5O12 Spin Pumping for Quantitative Understanding of Pure Spin Transport and Spin Hall Effect in a Broad Range of Materials
• Spin current generation from sputtered Y3Fe5O12 films
• Unexpected structural and magnetic depth dependence of YIG thin films
• Dephasing of Transverse Spin Current in Ferrimagnetic Alloys
• Influence of interface condition on spin-Seebeck effects
• Fermi Level Dependent Spin Pumping from a Magnetic Insulator into a Topological Insulator
• Nanoscale Spin Seebeck Rectifier: Controlling Thermal Spin Transport across Insulating Magnetic Junctions with Localized Spin
• Highly efficient spin-to-charge current conversion at room temperature in strained HgTe surface states
• Spin-pumping through a varying-thickness MgO interlayer in Fe/Pt system
• Probing length-scale separation of thermal and spin currents by nanostructuring YIG
• Spin Hall Magnetoimpedance
• Spin transport and spin conversion in compound semiconductor with non-negligible spin-orbit interaction
• Experimental and Numerical Understanding of Localized Spin Wave Mode Behavior in Broadly Tunable Spatially Complex Magnetic Configurations
• Spin injection into silicon detected by broadband ferromagnetic resonance spectroscopy
• Planar Hall effect induced spin rectification effect and its strong impact on spin pumping measurements
• Electrical control of spin mixing conductance in a Y${}_3$Fe${}_5$O${}_{12}$/Platinum bilayer
• Evidence of Pure Spin-Current Generated by Spin Pumping in Interface Localized States in Hybrid Metal-Silicon-Metal Vertical Structures
• Spin Hall Effect Induced Spin Transfer Through an Insulator
• Spin-wave-induced lateral temperature gradient in a YIG thin film/GGG system excited in an ESR cavity
• Enhancement of spin mixing conductance in La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$/LaNiO${}_3$/SrRuO${}_3$ heterostructures
• Spin-current mediated exchange coupling in MgO-based magnetic tunnel junctions
• Effect of Quantum Tunneling on Spin Hall Magnetoresistance
• Who pumps spin current into nonmagnetic-metal (NM) layer in YIG/NM multilayers at ferromagnetic resonance?