Ultrafast spin-transfer precessional switching between two stable states of a magnetic random access memory device is demonstrated in structures comprising a perpendicularly magnetized polarizing layer (PL(perpendicular to)), an in-plane magnetized free layer (FL), and an in-plane magnetized analyzing layer (AL) in a PL(perpendicular to)/spacer/FL/spacer/AL stack. Back and forth switching can be achieved with sub-ns current pulses of the same polarity. The spin-torque influence from the analyzer leads to an asymmetric dependence of the switching properties as a function of the current sign and initial state.
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IBM Corp, Almaden Res Ctr, 650 Harry Rd, San Jose, CA 95120 USA
Univ S Carolina, Dept Phys & Astron, Columbia, SC 29208 USA
Natl Acad Sci Ukraine, Inst Magnetism, UA-03142 Kiev, UkraineIBM Corp, Almaden Res Ctr, 650 Harry Rd, San Jose, CA 95120 USA
Bazaliy, Ya. B.
Olaosebikan, D.
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Cornell Univ, Dept Phys, Ithaca, NY 14853 USAIBM Corp, Almaden Res Ctr, 650 Harry Rd, San Jose, CA 95120 USA
Olaosebikan, D.
Jones, B. A.
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IBM Corp, Almaden Res Ctr, 650 Harry Rd, San Jose, CA 95120 USAIBM Corp, Almaden Res Ctr, 650 Harry Rd, San Jose, CA 95120 USA