Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-03-19
Physics
Condensed Matter
Other Condensed Matter
26 pages, 6 figures
Scientific paper
10.1103/PhysRevB.77.214440
The torque generated by the transfer of spin angular momentum from a spin-polarized current to a nanoscale ferromagnet can switch the orientation of the nanomagnet much more efficiently than a current-generated magnetic field, and is therefore in development for use in next-generation magnetic random access memory (MRAM). Up to now, only DC currents and square-wave current pulses have been investigated in spin-torque switching experiments. Here we present measurements showing that spin transfer from a microwave-frequency pulse can produce a resonant excitation of a nanomagnet and lead to improved switching characteristics in combination with a square current pulse. With the assistance of a microwave-frequency pulse, the switching time is reduced and achieves a narrower distribution than when driven by a square current pulse alone, and this can permit significant reductions in the integrated power required for switching. Resonantly excited switching may also enable alternative, more compact MRAM circuit architectures.
Buhrman Robert A.
Cui Yong-Tao
Li Zhi Peng
Ralph Daniel C.
Sankey Jack C.
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