Huge spin-transfer torque in a magnetic tunnel junction by a superlattice barrier
Journal
Physics Letters, Section A: General, Atomic and Solid State Physics
Journal Volume
381
Journal Issue
36
Pages
3124-3128
Date Issued
2017
Author(s)
Abstract
Huge spin-transfer torque (STT) in a magnetic tunnel junction (MTJ) achieved by superlattice barrier composed of alternate layers of a nonmagnetic metal and an insulator is proposed. The magnitude of the STT depends on the number of cells in the superlattice barrier and the nonmagnetic metal layer's thickness. The result shows that the STT of the novel superlattice-barrier MTJ can reach values up to four orders of magnitude greater than those of traditional single-barrier stacks based on three cells superlattice by designing the nonmagnetic metal layer's thickness. In addition, the spin-transfer torque of the proposed MTJ can also be thousands of magnitude greater than those of traditional double-barrier MTJs.
Type
journal article