X-ray imaging shows spin waves inside a spin Hall nano-oscillator for the first time
Researchers at the University of Gothenburg, Helmholtz-Zentrum Berlin (HZB), the University of Cambridge and the Max Planck Institute for Solid State Research have, for the first time, directly imaged the magnetization dynamics inside a spin Hall nano-oscillator (SHNO). Using time-resolved scanning transmission X-ray microscopy, the team observed spin-wave behavior that earlier, indirect measurements had missed. The team also found that prolonged X-ray exposure permanently altered the devices’ CoFeB/MgO interface.
In an SHNO, a direct current flowing through a heavy-metal layer generates spin-orbit torque in an adjacent ultrathin magnetic layer through the spin Hall effect. At a nanoscale constriction, the torque is strong enough to cancel magnetic damping and sustain steady precession of the magnetization, turning a DC input into a tunable microwave signal. SHNOs are simple to fabricate, CMOS-compatible and can mutually synchronize in large arrays, which makes them candidates for tunable microwave sources and for neuromorphic computing. The dynamics inside a single oscillator, however, play out over nanometers and fractions of a nanosecond. Until now they could only be inferred from indirect techniques.
Source: https://www.spintronics-info.com/x-ray-imaging-shows-spin-waves-inside-spin-hall-nano-oscillator-first-time
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