Magnetic DW Injector

Highly Efficient In-Line Magnetic Domain Wall Injector.
Timothy Phung, Aakash Pushp, Luc Thomas, Charles Rettner, See-Hun Yang, Kwang-Su Ryu, John Baglin, Brian Hughes, and Stuart Parkin

Nano Letters 15, 835 (2015)

We demonstrate a highly efficient and simple scheme for injecting domain walls into magnetic nanowires. The spin transfer torque from nanosecond long, unipolar, current pulses that cross a 90° magnetization boundary together with the fringing magnetic fields inherently prevalent at the boundary, allow for the injection of single or a continual stream of domain walls. Remarkably, the currents needed for this “in-line” domain wall injection scheme are at least one hundred times smaller than conventional methods.