Spin‐Dependent Thermoelectric Transport in Cobalt‐Based Heusler Alloys

Abstract

Sitting at the intersection of spintronics and thermoelectricity, research investigating the coupling of thermoelectric, magnetic, and electrical transport properties in materials has recently found that the ferromagnetic Heusler alloys are the ideal testbeds. These materials have attracted a lot of attention due to their useful magnetotransport properties and the possibility of tailoring these properties by modifying their composition or producing heterostructures. With the diverse range of interesting phenomena in the Heusler alloys, ferromagnetic Heusler alloys are also ideal candidates for engineering spin caloritronic devices that can take advantage of the interplay of the physics of heat flow, magnetism, and electric potential. The fundamental physical concepts important to spin-dependent thermoelectrics research are introduced and recent studies of several ferromagnetic Heusler compounds are reviewed, highlighting some exceptional latest experiments on half-metallic Co 2 TiSn and the ferromagnetic Weyl semimetal Co 2 MnGa. Furthermore, the potential to generate useful magnetothermoelectric voltages in electronic devices based on the anomalous Nernst effect is discussed.

Giant Anomalous Hall and Nernst Conductivities in Magnetic All‐d Metal Heusler Alloys

“…[ 13 ] They serve as an ideal playground for spintronics because of their high spin polarization and low magnetic damping coefficient. [ 14 ] In terms of topological properties, there are many ternary half‐Heusler compounds which can be classified as topological insulators. [ 15 ] Moreover, as demonstrated by Manna et al.…”

“…[13] They serve as an ideal playground for spintronics because of their high spin polarization and low magnetic damping coefficient. [14] In terms of topological properties, there are many ternary half-Heusler compounds which can be classified as topological insulators. [15] Moreover, as demonstrated by Manna et al, independent of the magnetization, AHC in the magnetic Heusler compounds can be controlled via the interplay of the crystal symmetry with the topological and geometrical properties of the Berry curvature (BC).…”

Orbital hybridisation effects in B2 phase Cr doped Co2MnAl

“…Co-based half metallic ferromagnets are interesting due to its promising applications in spintronic devices and spin dependent thermo electric transport [1]. These compounds exhibit Curie temperatures (T c ) well above room temperature (RT) and high tunnelling magnetoresistance compared to conventional ferromagnets like Fe 3 O 4 , CrO 2 and half Heusler alloy NiMnSb etc [2].…”

Thermoelectric CoGeTe with an Orthorhombic Crystal Symmetry and Balance of the Electrical and Thermal Properties

“…Co-based TE materials have attracted extensive attention in the past few decades . Some cobalt-based oxides, such as Ca 3 Co 4 O 9 , NaCo 2 O 4 , and Bi 2 Sr 2 Co 2 O 9 , generally have a high Seebeck coefficient and excellent stability at high temperature.…”

“…16 Co-based TE materials have attracted extensive attention in the past few decades. 19 22 generally have a high Seebeck coefficient and excellent stability at high temperature. Skutterudite CoSb 3 possesses excellent power factors and is deemed to be the most promising candidate for potential commercial TE devices.…”