Efficient Injection and Detection of Out-of-Plane Spins via the Anomalous Spin Hall Effect in Permalloy Nanowires

Kumar Sourav Das, Jing Liu, Bart J. van Wees, Ivan J. Vera-Marun

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Abstract

We report a novel mechanism for the electrical injection and detection of out-of-plane spin accumulation via the anomalous spin Hall effect (ASHE), where the direction of the spin accumulation can be controlled by manipulating the magnetization of the ferromagnet. This mechanism is distinct from the spin Hall effect (SHE), where the spin accumulation is created along a fixed direction parallel to an interface. We demonstrate this unique property of the ASHE in nanowires made of permalloy (Py) to inject and detect out-of-plane spin accumulation in a magnetic insulator, yttrium iron garnet (YIG). We show that the efficiency for the injection/detection of out-of-plane spins can be up to 50% of that of in-plane spins. We further report the possibility to detect spin currents parallel to the Py/YIG interface for spins fully oriented in the out-of-plane direction, resulting in a sign reversal of the nonlocal magnon spin signal. The new mechanisms that we have demonstrated are highly relevant for spin torque devices and applications.

Original languageEnglish
Pages (from-to)5633-5639
Number of pages7
JournalNano Letters
Volume18
Issue number9
DOIs
Publication statusPublished - Sep-2018

Keywords

  • Anomalous spin Hall effect
  • permalloy
  • yttrium iron garnet
  • out-of-plane spins
  • transverse spin current
  • electrical spin injection and detection
  • magnon spintronics
  • spin torque devices
  • MAGNETIC INSULATOR
  • ROOM-TEMPERATURE

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