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arXiv · 1502.04570

Electrical manipulation of a ferromagnet by an antiferromagnet

V. Tshitoyan·C. Ciccarelli·A. P. Mihai·M. Ali·A. C. Irvine·T. A. Moore·T. Jungwirth·A. J. Ferguson
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Abstract

We demonstrate that an antiferromagnet can be employed for a highly efficient electrical manipulation of a ferromagnet. In our study we use an electrical detection technique of the ferromagnetic resonance driven by an in-plane ac-current in a NiFe/IrMn bilayer. At room temperature, we observe antidamping-like spin torque acting on the NiFe ferromagnet, generated by the in-plane current driven through the IrMn antiferromagnet. A large enhancement of the torque, characterized by an effective spin-Hall angle exceeding most heavy transition metals, correlates with the presence of the exchange-bias field at the NiFe/IrMn interface. It highlights that, in addition to strong spin-orbit coupling, the antiferromagnetic order in IrMn governs the observed phenomenon.

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V. Tshitoyan, C. Ciccarelli, A. P. Mihai, M. Ali, A. C. Irvine, T. A. Moore, T. Jungwirth, A. J. Ferguson. 2015-09-22. Electrical manipulation of a ferromagnet by an antiferromagnet. https://doi.org/10.1103/physrevb.92.214406

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