Abstract
Using the non-equilibrium Green's function (NEGF) formalism within the sequential regime, we studied ultrahigh spin thermopower and pure spin current in single-molecule magnet(SMM), which is attached to nonmagnetic metal wires with spin bias and angle (θ) between the easy axis of SMM and the spin orientation in the electrodes. A pure spin current can be generated by tuning the gate voltage and temperature difference with finite spin bias and the arbitrary angle except of . In the linear regime, large thermopower can be obtained by modifying Vg and the angles (θ). These results are useful in fabricating and advantaging SMM devices based on spin caloritronics.
Highlights
Using the non-equilibrium Green’s function (NEGF) formalism within the sequential regime, we studied ultrahigh spin thermopower and pure spin current in single-molecule magnet(SMM), which is attached to nonmagnetic metal wires with spin bias and angle (h) between the easy axis of SMM and the spin orientation in the electrodes
We theoretically investigate the thermoelectric effects of a sandwich structure of NM/SMM/ NM with spin-bias[29,32,33] and angles (h) between the easy axis of SMM and the spin orientation in the electrodes
In this system, pure spin currents are observed even though the system temperature is higher than the blocking temperature due to the spin symmetry broken by spin bias
Summary
Using the non-equilibrium Green’s function (NEGF) formalism within the sequential regime, we studied ultrahigh spin thermopower and pure spin current in single-molecule magnet(SMM), which is attached to nonmagnetic metal wires with spin bias and angle (h) between the easy axis of SMM and the spin orientation in the electrodes. Spin caloritronics (spin Seebeck effect) was observed by Uchida et al[10,11] They found that the spin-polarized currents (I: and I;) can be induced by a temperature gradient and flow in opposite directions. A SMM in a single spin state is necessary for generating the pure spin current[21,22,29] without the magnetic field or magnetic electrodes It implies that the system temperature is limited by the blocking temperature of SMM (TB). We theoretically investigate the thermoelectric effects of a sandwich structure of NM/SMM/ NM with spin-bias[29,32,33] and angles (h) between the easy axis of SMM and the spin orientation in the electrodes.
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