Quantum mechanics of spin transfer in coupled electron-spin chains

Details Quantum mechanics of spin transfer in coupled electron-spin chains Quantum mechanics of spin transfer in coupled electron-spin chains

2007-03-02

arxiv.org/abs/cond-mat/0703068v1

Europhysics Letters 79. 67004 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 (colour) figures

Scientific paper

10.1209/0295-5075/79/67004

The manner in which spin-polarized electrons interact with a magnetized thin film is currently described by a semi-classical approach. This in turn provides our present understanding of the spin transfer, or spin torque phenomenon. However, spin is an intrinsically quantum mechanical quantity. Here, we make the first strides towards a fully quantum mechanical description of spin transfer through spin currents interacting with a Heisenberg-coupled spin chain. Because of quantum entanglement, this requires a formalism based on the density matrix approach. Our description illustrates how individual spins in the chain time-evolve as a result of spin transfer.

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