Magneto-Seebeck effect in bismuth

Microchip construction for Seebeck-effect measurements on bismuth nanowires

The characterization of thermoelectric properties of nanoscale materials is a current topic of intensive research. Especially bismuth nanowires are very attractive because of their extraordinary properties and possible applications in thermoelectric devices. For the calculation of the thermoelectric figure of merit z = α2σ/λ, the Seebeck coefficient α, the electrical conductivity σ and the ther...

Tunnel magneto-Seebeck effect: Improving the effect size Spintronics and spincaloritronics

On/off switching of bit readout in bias-enhanced tunnel magneto-Seebeck effect

Thermoelectric effects in magnetic tunnel junctions are promising to serve as the basis for logic devices or memories in a "green" information technology. However, up to now the readout contrast achieved with Seebeck effects was magnitudes smaller compared to the well-established tunnel magnetoresistance effect. Here, we resolve this problem by demonstrating that the tunnel magneto-Seebeck effe...

Time-resolved measurement of the tunnel magneto-Seebeck effect in a single magnetic tunnel junction.

Recently, several groups have reported spin-dependent thermoelectric effects in magnetic tunnel junctions. In this paper, we present a setup for time-resolved measurements of thermovoltages and thermocurrents of a single micro- to nanometer-scaled tunnel junction. An electrically modulated diode laser is used to create a temperature gradient across the tunnel junction layer stack. This laser mo...

Antiferromagnetic Spin Seebeck Effect.

We report on the observation of the spin Seebeck effect in antiferromagnetic MnF_{2}. A device scale on-chip heater is deposited on a bilayer of MnF_{2} (110) (30  nm)/Pt (4 nm) grown by molecular beam epitaxy on a MgF_{2} (110) substrate. Using Pt as a spin detector layer, it is possible to measure the thermally generated spin current from MnF_{2} through the inverse spin Hall effect. The low ...