Deposition temperature dependence of thermo-spin and magneto-thermoelectric conversion in Co${}_2$MnGa films on Y${}_3$Fe${}_5$O${}_{12}$ and Gd${}_3$Ga${}_5$O${}_{12}$

Abstract

We have characterized Co${}_2$MnGa (CMG) Heusler alloy films grown on Y${}_3$Fe${}_5$O${}_{12}$ (YIG) and Gd${}_3$Ga${}_5$O${}_{12}$ (GGG) substrates at different deposition temperatures and investigated thermo-spin and magneto-thermoelectric conversion properties by means of a lock-in thermography technique. X-ray diffraction, magnetization, and electrical transport measurements show that the deposition at high substrate temperatures induces the crystallized structures of CMG while the resistivity of the CMG films on YIG (GGG) prepared at and above 500 °C (550 °C) becomes too high to measure the thermo-spin and magneto-thermoelectric effects due to large roughness, highlighting the difficulty of fabricating highly ordered continuous CMG films on garnet structures. Our lock-in thermography measurements show that the deposition at high substrate temperatures results in an increase in the current-induced temperature change for CMG/GGG and a decrease in that for CMG/YIG. The former indicates the enhancement of the anomalous Ettingshausen effect in CMG through crystallization. The latter can be explained by the superposition of the anomalous Ettingshausen effect and the spin Peltier effect induced by the positive (negative) charge-to-spin conversion for the amorphous (crystallized) CMG films. These results provide a hint to construct spin-caloritronic devices based on Heusler alloys.

arXiv comment14 pages, 4 figures

References in corpus (22)

• Spin Seebeck insulator
• Giant anomalous Nernst effect and quantum-critical scaling in a ferromagnetic semimetal
• Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet
• Heusler, Weyl, and Berry
• Anomalous Nernst effect beyond the magnetization scaling relation in the ferromagnetic Heusler compound Co${}_2$MnGa
• Observation of the spin Peltier effect
• Thermal imaging of spin Peltier effect
• Fermi level tuning and atomic ordering induced giant anomalous Nernst effect in Co2MnAl1-xSix Heusler alloy
• Spin-polarized Weyl cones and gigantic anomalous Nernst effect in ferromagnetic Heusler films
• Thickness dependence of the anomalous Hall effect in thin films of the topological semimetal Co${}_2$MnGa
• Visualization of Anomalous Ettingshausen Effect in a Ferromagnetic Film: Direct Evidence of Different Symmetry from Spin Peltier Effect
• Giant spin Hall angle in the Heusler alloy Weyl ferromagnet Co${}_2$MnGa
• Efficient spin transport in a paramagnetic insulator
• Magnetization switching induced by spin-orbit torque from Co2MnGa magnetic Weyl semimetal thin films
• Spintronic thermal management
• Systematic Investigation of Anisotropic Magneto-Peltier Effect and Anomalous Ettingshausen Effect in Ni Thin Films
• Spin-mediated charge-to-heat current conversion phenomena in ferromagnetic binary alloys
• Magnetic tunnel junctions with a B2-ordered CoFeCrAl equiatomic Heusler alloy
• Thermographic measurements of spin-current-induced temperature modulation in metallic bilayers
• Experimental proof of the reciprocal relation between spin Peltier and spin Seebeck effects in a bulk YIG/Pt bilayer
• Transient response of spin Peltier effect revealed by lock-in thermoreflectance measurement
• Spin-charge conversion in NiMnSb Heusler alloy films

Cited by in corpus (1)

• Anomalous Ettingshausen effect in iron-carbon alloys