Abstract
Spin-torque efficiency and asymmetry are key parameters of the magnetic materials used in advanced devices such as spin-torque nano-oscillators (STNOs) and spin-transfer-torque magnetic random-access memory (STT-MRAM). Few studies have reported actual values, though, and even those come with large uncertainty. By experimentally mapping the magnetic-droplet current-field phase diagram in orthogonal spin-valve STNOs, the authors determine both parameters as functions of stoichiometry, for alloys of Co, Ni, and Fe. This work offers a method to determine, improve, and tailor spin-torque efficiency and asymmetry in STNOs and other spintronic applications.
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