Spin structure of Graphene/Pt interface for spin current formation and induced magnetization in deposited (Ni-Fe)-nanodots

Abstract

Spin electronic structure of graphene pi-states and Pt 5d-states for the Graphene/Pt interface has been investigated. Here, we report a large induced spin-orbit splitting (~70-100 meV) of graphene pi-states with formation of non-degenerated Dirac-cone spin states at the K-point of the BZ crossed with spin-polarized Pt 5d-states at Fermi level that opens up a possibility for creation of new spintronics devices. We propose to use this spin structure for formation of spin current with spin locked perpendicular to the momentum for induced remagnetization of the (Ni-Fe)-nanodots arranged atop the interface. Theoretical estimations of the spin current created at the Graphene/Pt interface and the induced intrinsic effective magnetic field leading to the in-plane remagnetization of the NiFe-nanodots due to spin-orbit torque effect are presented. By micromagnetic modeling based on experimentally observed spin-orbit splitting we demonstarte that the induced intrinsic magnetic field might be effectively used for magnetization swithching of the deposited (Ni-Fe)-nanodots.

References in corpus (8)

• Spin Transfer Torques
• Current-driven dynamics of chiral ferromagnetic domain walls
• Symmetry and magnitude of spin-orbit torques in ferromagnetic heterostructures
• Graphite and graphene as perfect spin filters
• Matching domain wall configuration and spin-orbit torques for very efficient domain-wall motion
• Cyclotron Resonance study of the electron and hole velocity in graphene monolayers
• Theoretical prediction of perfect spin filtering at interfaces between close-packed surfaces of Ni or Co and graphite or graphene
• High domain wall velocities due to spin currents perpendicular to the plane