Low-current spintronic Kapitza pendulum enables probabilistic magnetic states
Researchers from University College London, University of Leeds, Tohoku University, Imperial College London and Japan Atomic Energy Agency have demonstrated that spin transfer torques in nearly isotropic CoFeB-based magnets can dynamically stabilize magnetic states that are unstable in equilibrium, realizing a nanoscale spintronic analogue of the Kapitza pendulum.
The team uses MgO∣CoFeB∣W multilayers, where the demagnetizing field favors in-plane magnetization while an interface-induced perpendicular magnetic anisotropy (PMA), tuned by post-growth annealing, counter-balances this tendency. By carefully optimizing the growth-annealing protocol, the shape and interface anisotropies almost cancel, yielding magnets with vanishingly small effective anisotropy that are nearly isotropic on the Bloch sphere. This near-isotropy is crucial because it suppresses conventional auto-oscillations and lowers the critical current needed to drive the system into a strongly nonlinear dynamical regime.
Source: https://www.spintronics-info.com/low-current-spintronic-kapitza-pendulum-enables-probabilistic-magnetic-states
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