Current-controlled magnetic domain-wall nanowire shift register.
The controlled motion of a series of domain walls along magnetic nanowires using spin-polarized current pulses is the essential ingredient of the proposed magnetic racetrack memory, a new class of potential non-volatile storage-class memories. Using permalloy nanowires, we achieved the successive creation, motion, and detection of domain walls by using sequences of properly timed, nanosecond-long, spin-polarized current pulses. The cycle time for the writing and shifting of the domain walls was a few tens of nanoseconds. Our results illustrate the basic concept of a magnetic shift register that relies on the phenomenon of spin-momentum transfer to move series of closely spaced domain walls.
Hayashi
Masamitsu
M
IBM Research Division, Almaden Research Center, San Jose, CA 95120, USA.
Thomas
Luc
L
Moriya
Rai
R
Rettner
Charles
C
Parkin
Stuart S P
SS