Abstract
From a practical point of view, a critical issue for the spin transfer effect is the reduction of the critical switching current density Jc. Over the past few years, the reported Jc at room temperature is in the range of 106 A cm−2. Here we report a low critical switching current density Jc of about 4.2 × 103 A cm−2 for spin transfer in Fe–MgO nanoscale granular film at room temperature, which is due to the low effective anisotropy field of the small Fe particles.
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