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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
; | | Date: |
16 Feb 2015 | | Abstract: | Recently, a new direction in spintronics has been proposed based on
non-relativistic and relativistic spin-transport phenomena in which
antiferromagnets (AFMs) complement or replace ferromagnets (FMs) in active
parts of the device. In one type of these devices, including AFM
magneto-resistors and memories, the manipulation of the AFM moments is
facilitated via a FM which is sensitive to external magnetic fields. The
inherent insensitivity of AFMs to magnetic fields might suggest that realizing
a device with the inverse functionality, i.e. with the manipulation of FM
moments via an AFM, represents merely an academic exercise of uncertain
feasibility and utility. Here we demonstrate that an AFM can be employed for a
highly efficient electrical manipulation of a FM. In our study we use an
electrical detection technique of the ferromagnetic resonance (FMR) 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 FM, generated by the in-plane
current driven through the IrMn AFM. 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 AFM order in IrMn governs the observed phenomenon. | | Source: | arXiv, 1502.4570 | | Services: | Forum | Review | PDF | Favorites | |
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