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Recently, Heusler alloys-based spin gapless semiconductors (SGSs) with highCurie temperature (TC) and sizeable spin polarization have emerged as potentialcandidates for tunable spintronic applications. We report comprehensiveinvestigation of the temperature dependent ANE and intrinsic longitudinal spinSeebeck effect (LSSE) in CoFeCrGa thin films grown on MgO substrates. Ourfindings show the anomalous Nernst coefficient for the MgO/CoFeCrGa (95 nm)film is $\cong 1.86$ micro V/K at room temperature which is nearly two ordersof magnitude higher than that of the bulk polycrystalline sample of CoFeCrGa (=0.018 micro V/K) but comparable to that of the magnetic Weyl semimetal Co2MnGathin film (2-3 micro V/K). Furthermore, the LSSE coefficient for ourMgO/CoFeCrGa(95nm)/Pt(5nm) heterostructure is $\cong 20.5$ $\mu$V/K/$\Omega$ atroom temperature which is twice larger than that of the half-metallicferromagnetic La$_{0.7}$Sr$_{0.3}$MnO$_3$ thin films ($\cong$ 20.5$\mu$V/K/$\Omega$). We show that both ANE and LSSE coefficients followidentical temperature dependences and exhibit a maximum at $\cong$ 225 K whichis understood as the combined effects of inelastic magnon scatterings andreduced magnon population at low temperatures. Our analyses not only indicatethat the extrinsic skew scattering is the dominating mechanism for ANE in thesefilms but also provide critical insights into the functional form of theobserved temperature dependent LSSE at low temperatures. Furthermore, byemploying radio frequency transverse susceptibility and broadband ferromagneticresonance in combination with the LSSE measurements, we establish a correlationamong the observed LSSE signal, magnetic anisotropy and Gilbert damping of theCoFeCrGa thin films, which will be beneficial for fabricating tunable andhighly efficient Heusler alloys based spincaloritronic nanodevices.

Large thermo-spin effects in Heusler alloy based spin-gapless semiconductor thin films