Magnetization switching by spin-orbit torque in an antiferromagnet-ferromagnet bilayer system.
By Shunsuke Fukami, Chaoliang Zhang, S. DuttaGupta, A. Kurenkov, Hideo Ohno. Nature Materials, 2015
1,017 citations recorded by the source corpus.
Spin-orbit torque (SOT)-induced magnetization switching shows promise for realizing ultrafast and reliable spintronics devices. Bipolar switching of the perpendicular magnetization by the SOT is achieved under an in-plane magnetic field collinear with an applied current. Typical structures studied so far comprise a nonmagnet/ferromagnet (NM/FM) bilayer, where the spin Hall effect in the NM is responsible for the switching. Here we show that an antiferromagnet/ferromagnet (AFM/FM) bilayer system also exhibits a SOT large enough to switch the magnetization of the FM. In this material system, thanks to the exchange bias of the AFM, we observe the switching in the absence of an applied field by using an antiferromagnetic PtMn and ferromagnetic Co/Ni multilayer with a perpendicular easy axis. Furthermore, tailoring the stack achieves a memristor-like behaviour where a portion of the reversed magnetization can be controlled in an analogue manner. The AFM/FM system is thus a promising building block for SOT devices as well as providing an attractive pathway towards neuromorphic computing.
Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/c19fd492ac8632067ac043f5cb9abe20aba68108
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In Atomic and Molecular Physics, and Optics
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Citations in the corpus
- Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems (2018, background): “For instance this is the case of FM (Ga,Mn)As and NiMnSb, or systems modeled by the 14 2D Rashba Hamiltonian, or AFs Mn2Au and CuMnAs, discussed in Section III.”
- Stochastic p-bits for Invertible Logic (2016, methodology): “Recent experiments using a built-in exchange bias [26–29] could make this approach applicable to PMA as well.”
- Antiferromagnetic spintronics (2016, background): “Their results showed that the spin Hall torques, either directly from the antiferromagnet (Fukami et al., 2016; Oh et al., 2016) (see Fig.”