Anomalous Hall and Nernst Effects in Co2TiSn and Co2Ti0.6

Junfeng Hu

¹

,

Benedikt Ernst

²

,

Shiao‐Chun Tu

³

et al.

Spin‐Dependent Thermoelectric Transport in Cobalt‐Based Heusler Alloys

“…Considering a tensorial expression of̃=̃S, one can derive the Seebeck coeffcient S and the anomalous Nernst coefficient N and, thereby, the anomalous Nernst angle can be written as [88] :…”

“…A similar but slightly smaller Seebeck coefficient (−30 µV/K) was observed in CTS thin films at room temperature. [88] Balke et al [95] reported a very comprehensive study of the Seebeck coefficient (Figure 3b) of ferromagnetic cobalt-based Heusler alloys (Co 2 XY, X = Fe, Mn, or Ti; Y = Al, Si, Ge, or Sn). In addition, they confirmed the ferromagnetic half-metallic properties of cobalt-based Heusler alloys by calculating the band structure and measuring the magnetic properties (Curie temperature and magnetic moment) of some selected Heusler samples ( Figure 3a) together with the Seebeck coefficient dependence in the full temperature range from 2 to 900 K. At high temperatures, the observed Seebeck coefficient is negative over the entire temperature range.…”

“…magnetized MgO/CMS/Pd, [85] MgO/CMFS/Pd trilayers, [78] and CMFS-based junctions. [86] Co 2 TiSn (CTS) is also one of the promising candidates for spin manipulation and for spintronic applications [52,66,76,[87][88][89] due to its high spin polarization. [90] With their diverse range of magnetic and thermoelectric properties, combined with the strong spin polarizations in a number of them, [91] ferromagnetic Heusler alloys could also be ideal materials to study and exploit spin-dependent thermoelectric effects.…”

“…[90] With their diverse range of magnetic and thermoelectric properties, combined with the strong spin polarizations in a number of them, [91] ferromagnetic Heusler alloys could also be ideal materials to study and exploit spin-dependent thermoelectric effects. Experimental investigations of the ANE have been explored in Heusler alloys, [25,88,[92][93][94] as well as the Seebeck effect [95] and spin-dependent thermoelectric transport effects including the SSE, [96][97][98] tunnel magneto-Seebeck (TMS) effect, [99,100] PNE and AMTEP. [52] In addition, the TMS investigated in Heusler-based magnetic tunnel junctions (MTJs) is large compared with conventional materials, such as CoFeBbased MTJs, marking out the magnetic Heusler compounds as an interesting materials class for spin caloritronic devices.…”

“…[52] In addition, the TMS investigated in Heusler-based magnetic tunnel junctions (MTJs) is large compared with conventional materials, such as CoFeBbased MTJs, marking out the magnetic Heusler compounds as an interesting materials class for spin caloritronic devices. Hu et al [88] have studied the Heusler compound CTS and found by doping with vanadium (Co 2 Ti 0.6 V 0.4 Sn, CTVS) its electric transport and particularly thermoelectric properties can be affected a lot. A similar influence of doping has been investigated in other materials, such as (Ga,Mn)As [101] and Bi 2 Te 3−x Se x .…”