Electrical Detection of Direct and Alternating Spin Current Injected from a Ferromagnetic Insulator into a Ferromagnetic Metal

Abstract

We report room temperature electrical detection of spin injection from a ferromagnetic insulator (YIG) into a ferromagnetic metal (Permalloy, Py). Non-equilibrium spins with both static and precessional spin polarizations are dynamically generated by the ferromagnetic resonance of YIG magnetization, and electrically detected by Py as dc and ac spin currents, respectively. The dc spin current is electrically detected via the inverse spin Hall effect of Py, while the ac spin current is converted to a dc voltage via the spin rectification effect of Py which is resonantly enhanced by dynamic exchange interaction between the ac spin current and the Py magnetization. Our results reveal a new path for developing insulator spintronics, which is distinct from the prevalent but controversial approach of using Pt as the spin current detector.

5 pages, 4 figures

References in corpus (6)

• Electrical Detection of Spin Transport in Lateral Ferromagnet-Semiconductor Devices
• Longitudinal Spin Seebeck Effect Free from the Proximity Nernst Effect
• Microwave photovoltage and photoresistance effects in ferromagnetic microstrips
• A Universal Method for Separating Spin Pumping from Spin Rectification Voltage of Ferromagnetic Resonance
• Experimental observation of a large ac-spin Hall effect
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