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Reasons from spin-orbit coupling, spin diffusion length, exchange and DMI, and spin-dependent transport through MTJ/TMR characterization, ST-FMR and harmonic-Hall torque measurement, nonlocal spin valves, and Valet-Fert and MuMax3/OOMMF modeling, while treating barrier pinholes and shunt paths, ordinary-versus-anomalous Hall and ISHE confusion, Oersted-field and Joule-heating artifacts, and incomplete magnetization switching as first-class failure modes.