Spin transfer and current-induced switching in antiferromagnets

By H. Gomonay, V. Loktev. 2009

220 citations recorded by the source corpus.

Recent experiments show that spin-polarized current may influence the state of generally accessory element of spin valves, an antiferromagnetic (AFM) layer, which is used for ``pinning.'' Here we study the dynamics of AFM component of the ``pinned'' ferromagnetic (FM) layer induced by simultaneous application of the spin-polarized current and external magnetic field. We find stability range of such a configuration of FM/AFM system in which orientation of FM magnetization is parallel to AFM vector. We calculate the field dependence of the critical current for different orientations of the external magnetic field with respect to the crystal axes of FM/AFM bilayer. We show the possibility of stable current-induced precession of AFM vector around FM magnetization with the frequency that linearly depends on the bias current. Furthermore, we estimate an optimal duration of the current pulse required for switching between different states of FM/AFM system and calculate the current and field dependencies of switching time. The results obtained reveal the difference between dynamics of ferromagnets and antiferromagnets subjected to spin transfer torques.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/3639d3c03203aadebf974237268d64ad7e02e317

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In Atomic and Molecular Physics, and Optics

In Electrical and Electronic Engineering

In Electronic, Optical and Magnetic Materials

Citations in the corpus

Spin-Orbit Torque Efficiency in Compensated Ferrimagnetic Cobalt-Terbium Alloys (2016, methodology): “s generated from SOI [along the 𝒙 direction in Fig. 1(d)]. Because the torque is an even function of the local magnetic moment 𝒎, effects from both sublattices in the RE-TM alloy add constructively [1,28]. At equilibrium positions, 𝒎 and 𝝈 are perpendicular to each other, and it is usually conve”
Antiferromagnetic spintronics (2016, background): “…and must have the generic form τA ¼ τ∥mA × ðp ×mAÞ þ τ⊥mA × p; τB ¼ τ∥mB × ðp ×mBÞ − τ⊥mB × p; ð23Þ which results in a torque on the order parameter ∂2t l × ljτ ¼ γHEτ∥2 l × ðp × lÞ þ γHEτ⊥l × p: ð24Þ Gomonay and Loktev (2010, 2014) and Gomonay, Kunitsyn, and Loktev (2012) investigated the…”
Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems (2018, background): “This form of the torque has been predicted theoretically (Cheng et al., 20 2014; Gomonay et al., 2012; Železný et al., 2014) and it was shown that it can indeed efficiently manipulate the AF order (Gomonay et al., 2012; Gomonay and Loktev, 2010).”