Spin-momentum helical locking induced spin-valve effects in topological insulator/ferromagnet heterostructures

Details Spin-momentum helical locking induced spin-valve effects in topological insulator/ferromagnet heterostructures Spin-momentum helical locking induced spin-valve effects in topological insulator/ferromagnet heterostructures

2011-09-07

arxiv.org/abs/1109.1379v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

25 pages including 11 figures

Scientific paper

Topological insulator is composed of an insulating bulk state and an odd number of massless spin-helical Dirac cone formed two-dimensional surface state. Here, we report a novel spin-valve effect in Bi1.5Sb0.5Te1.8Se1.2/CoFe heterostructures. This effect indicates the spin-momentum helical locking on the Bi1.5Sb0.5Te1.8Se1.2 topological surface state. It is also indicated that the characteristics of helical surface can be preserved at topological insulator/ferromagnet interface although the ferromagnetism can break the time reversal symmetry and therefore generate an energy gap at the topological Dirac point.

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